Transportation Geotechnics最新文献_第3页

Analysis of skid resistance of epoxy chip seal based on three-dimensional power spectrum 基于三维功率谱的环氧切屑密封防滑性能分析

IF 5.5 2区工程技术 Q1 ENGINEERING, CIVIL

Transportation Geotechnics

Pub Date : 2026-03-01 Epub Date: 2026-01-11 DOI: 10.1016/j.trgeo.2026.101902

Min Wang , Kaiyi Li , Jie Wang , Zhuowei Li , Hui Lv , Lulu Hu

Epoxy chip seal as an effective means to improve the anti-skid performance of concrete pavements is increasingly widely used, its skid resistance is significantly affected by its surface texture, but its skid resistance performance and durability analysis method is single. To address the these issues, a high toughness modified epoxy resin chip seal structure was developed to carry out indoor accelerated abrasion test, selecting the material bearing area curve and three-dimensional power spectrum function to study the surface texture structure and decay law of the epoxy chip seal specimen with different abrasion time, analyze the relationship between the three-dimensional surface roughness power spectrum function and the coefficient of friction, and study the effect of the different contact area ratios and wavelengths on the dynamic friction. The results show that in the abrasion process, the degree of abrasion at the top of the aggregate is larger than that at the bottom, and the influence of the surface micro-texture structure on the coefficient of kinetic friction is larger than that of the macro texture, the effective contact area of epoxy chip seal specimens with two aggregate sizes of 2–3 mm and 3–5 mm are 30∼40 % and 20∼40 % respectively, and the corresponding optimal wavelengths are 0.2 mm–5.04 mm, 0.3 mm–5.04 mm, at the same time, the correlation coefficient of the dynamic friction coefficient model based on the surface roughness power spectrum function and abrasion time under the multi-scale texture structure reaches 0.8, which shows that the use of the surface texture power spectrum density function can effectively evaluate the anti-skidding performance of the pavement.

环氧切屑密封作为提高混凝土路面防滑性能的有效手段得到越来越广泛的应用，其防滑性能受其表面纹理的影响较大，但其防滑性能和耐久性分析方法单一。针对这些问题，研制了一种高韧性改性环氧树脂切屑密封结构进行室内加速磨损试验，选取材料承载面积曲线和三维功率谱函数，研究不同磨损时间下环氧树脂切屑密封试样的表面组织结构和衰减规律，分析三维表面粗糙度功率谱函数与摩擦系数的关系；并研究了不同接触面积比和不同波长对动摩擦的影响。结果表明,在磨损过程中,磨损的程度总大于顶部的底部,和表面micro-texture结构的影响大于动摩擦系数的宏观结构,环氧树脂的有效接触面积芯片密封样本和两个总大小的2 - 3毫米,3 - 5毫米分别为30∼40%和20∼40%,和相应的最优波长0.2毫米,5.04毫米,0.3毫米,5.04毫米,同时，基于多尺度纹理结构下表面粗糙度功率谱函数与磨损时间的动态摩擦系数模型相关系数达到0.8，表明利用表面纹理功率谱密度函数可以有效评价路面的抗滑性能。

{"title":"Analysis of skid resistance of epoxy chip seal based on three-dimensional power spectrum","authors":"Min Wang , Kaiyi Li , Jie Wang , Zhuowei Li , Hui Lv , Lulu Hu","doi":"10.1016/j.trgeo.2026.101902","DOIUrl":"10.1016/j.trgeo.2026.101902","url":null,"abstract":"<div><div>Epoxy chip seal as an effective means to improve the anti-skid performance of concrete pavements is increasingly widely used, its skid resistance is significantly affected by its surface texture, but its skid resistance performance and durability analysis method is single. To address the these issues, a high toughness modified epoxy resin chip seal structure was developed to carry out indoor accelerated abrasion test, selecting the material bearing area curve and three-dimensional power spectrum function to study the surface texture structure and decay law of the epoxy chip seal specimen with different abrasion time, analyze the relationship between the three-dimensional surface roughness power spectrum function and the coefficient of friction, and study the effect of the different contact area ratios and wavelengths on the dynamic friction. The results show that in the abrasion process, the degree of abrasion at the top of the aggregate is larger than that at the bottom, and the influence of the surface micro-texture structure on the coefficient of kinetic friction is larger than that of the macro texture, the effective contact area of epoxy chip seal specimens with two aggregate sizes of 2–3 mm and 3–5 mm are 30∼40 % and 20∼40 % respectively, and the corresponding optimal wavelengths are 0.2 mm–5.04 mm, 0.3 mm–5.04 mm, at the same time, the correlation coefficient of the dynamic friction coefficient model based on the surface roughness power spectrum function and abrasion time under the multi-scale texture structure reaches 0.8, which shows that the use of the surface texture power spectrum density function can effectively evaluate the anti-skidding performance of the pavement.</div></div>","PeriodicalId":56013,"journal":{"name":"Transportation Geotechnics","volume":"58 ","pages":"Article 101902"},"PeriodicalIF":5.5,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146039519","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Damage mechanism of double-block ballastless track on subgrade under coupled complex loads 复合载荷耦合作用下路基双块无砟轨道损伤机理研究

IF 5.5 2区工程技术 Q1 ENGINEERING, CIVIL

Transportation Geotechnics

Pub Date : 2026-03-01 Epub Date: 2026-01-24 DOI: 10.1016/j.trgeo.2026.101912

Xuhao Cui , Yapeng Liu , Bowen Du , Hong Xiao , Lei Xu , Zhihai Zhang , Yang Wang

When CRTS I double-block ballastless track is subjected to coupled loads such as differential subgrade settlement (DSS) and temperature gradients (TG), its mechanical response is significantly affected, making it difficult to guarantee railway operational efficiency and safety. This study established a detailed finite element model of the CRTS I double-block ballastless track on subgrade, which integrates the concrete damage plasticity model and the cohesive zone model. With DSS and TG taken as initial conditions, the changes in track geometry and structural damage before and after the application of train loads were examined. The findings indicate that under the influence of TG and DSS, damage to the supporting layer initiates at the lower surface, while the initial damage location of the track slab is influenced by the positive or negative nature of TG. When the negative TG acts together with DSS, more severe structural deformation and damage occur. Under negative TG, the maximum vertical rail deformation and the settlement threshold corresponding to full damage of the supporting layer are 1.57 times and 80% of those under the positive TG, respectively. The application of train loads further accelerates the progression of damage and deformation in the track structure, decreasing the settlement threshold for complete damage under the positive TG from 25 mm to 20 mm, while the maximum rail deformation increases by 33.1%. This study provides a theoretical basis for damage identification and the refinement of settlement control criteria for ballastless tracks in complex loading environments.

CRTS I型双块无砟轨道在受到路基差沉降（DSS）和温度梯度（TG）等耦合荷载作用时，其力学响应受到较大影响，难以保证铁路的运行效率和安全。本研究将混凝土损伤塑性模型与黏结区模型相结合，建立了CRTS I型路基双块无砟轨道的详细有限元模型。以DSS和TG为初始条件，研究了列车荷载作用前后轨道几何形状和结构损伤的变化。研究结果表明：在热重和DSS的作用下，轨道板的初始损伤位置受热重的正负性质的影响，而支承层的损伤是从下表面开始的。当负TG与DSS共同作用时，会发生更严重的结构变形和损伤。负TG作用下，最大竖向钢轨变形是正TG作用下的1.57倍，支撑层完全破坏对应的沉降阈值是正TG作用下的80%。列车荷载的作用进一步加速了轨道结构损伤和变形的进程，使正TG作用下完全损伤的沉降阈值从25 mm降低到20 mm，而轨道的最大变形增加了33.1%。该研究为复杂载荷环境下无砟轨道的损伤识别和沉降控制准则的细化提供了理论依据。

{"title":"Damage mechanism of double-block ballastless track on subgrade under coupled complex loads","authors":"Xuhao Cui , Yapeng Liu , Bowen Du , Hong Xiao , Lei Xu , Zhihai Zhang , Yang Wang","doi":"10.1016/j.trgeo.2026.101912","DOIUrl":"10.1016/j.trgeo.2026.101912","url":null,"abstract":"<div><div>When CRTS I double-block ballastless track is subjected to coupled loads such as differential subgrade settlement (DSS) and temperature gradients (TG), its mechanical response is significantly affected, making it difficult to guarantee railway operational efficiency and safety. This study established a detailed finite element model of the CRTS I double-block ballastless track on subgrade, which integrates the concrete damage plasticity model and the cohesive zone model. With DSS and TG taken as initial conditions, the changes in track geometry and structural damage before and after the application of train loads were examined. The findings indicate that under the influence of TG and DSS, damage to the supporting layer initiates at the lower surface, while the initial damage location of the track slab is influenced by the positive or negative nature of TG. When the negative TG acts together with DSS, more severe structural deformation and damage occur. Under negative TG, the maximum vertical rail deformation and the settlement threshold corresponding to full damage of the supporting layer are 1.57 times and 80% of those under the positive TG, respectively. The application of train loads further accelerates the progression of damage and deformation in the track structure, decreasing the settlement threshold for complete damage under the positive TG from 25 mm to 20 mm, while the maximum rail deformation increases by 33.1%. This study provides a theoretical basis for damage identification and the refinement of settlement control criteria for ballastless tracks in complex loading environments.</div></div>","PeriodicalId":56013,"journal":{"name":"Transportation Geotechnics","volume":"58 ","pages":"Article 101912"},"PeriodicalIF":5.5,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146080583","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Small-scale test on the response of adjacent piles caused by shield tunnel excavation in sand 砂中盾构隧道开挖引起邻近桩响应的小尺度试验

IF 5.5 2区工程技术 Q1 ENGINEERING, CIVIL

Transportation Geotechnics

Pub Date : 2026-03-01 Epub Date: 2026-02-07 DOI: 10.1016/j.trgeo.2026.101942

Shan-wei Liu , Qian-qing Zhang , Ruo-feng Feng

Additional settlement and stress of the surrounding high-rise buildings, bridges, high-speed railways and other pile-supported structures will be caused by the excavation process of shield tunnel, and there is a need to evaluate the influence of tunneling excavation on adjacent pile-supported structures and surrounding soil. This paper presents a small-scale test for the response of adjacent piles with different pile lengths, diameters, and pile-tunnel relative positions caused by tunnel excavation in sand. A testing machine for the precise simulation of shield tunneling process was developed, and the concrete piles of different specifications were made. The data on the displacement of surrounding sandy soil and axial force of adjacent piles induced by tunnel excavation were collected and analyzed by utilizing specially designed sensors and data collection and analysis software. Furthermore, the influence of pile length, pile diameter, pile-tunnel relative distance, and pile head load on surrounding sandy soil’s displacement caused by tunnel excavation was revealed, and the variation of axial force of adjacent piles caused by tunnel excavation with different pile lengths, pile diameters, and pile-tunnel relative distances was clarified. The relevant achievements can provide scientific guidance and practical support for disaster prevention and control of adjacent in-service piles during tunnel excavation in sand.

盾构隧道开挖过程会给周边高层建筑、桥梁、高速铁路等桩基结构带来额外的沉降和应力，需要评估隧道开挖对周边桩基结构和周围土体的影响。本文对砂土中隧道开挖对相邻不同桩长、桩径和桩隧相对位置的响应进行了小尺度试验研究。研制了盾构隧道施工过程精密模拟试验机，并制作了不同规格的混凝土桩。利用专门设计的传感器和数据采集分析软件，对隧道开挖引起的周边砂土位移和邻近桩轴力数据进行采集和分析。揭示了桩长、桩径、桩隧相对距离、桩头荷载对隧道开挖引起的周边砂土位移的影响，阐明了不同桩长、桩径、桩隧相对距离下隧道开挖引起的相邻桩轴力的变化。相关研究成果可为砂土隧道开挖中相邻在役桩的灾害防治提供科学指导和实践支持。

{"title":"Small-scale test on the response of adjacent piles caused by shield tunnel excavation in sand","authors":"Shan-wei Liu , Qian-qing Zhang , Ruo-feng Feng","doi":"10.1016/j.trgeo.2026.101942","DOIUrl":"10.1016/j.trgeo.2026.101942","url":null,"abstract":"<div><div>Additional settlement and stress of the surrounding high-rise buildings, bridges, high-speed railways and other pile-supported structures will be caused by the excavation process of shield tunnel, and there is a need to evaluate the influence of tunneling excavation on adjacent pile-supported structures and surrounding soil. This paper presents a small-scale test for the response of adjacent piles with different pile lengths, diameters, and pile-tunnel relative positions caused by tunnel excavation in sand. A testing machine for the precise simulation of shield tunneling process was developed, and the concrete piles of different specifications were made. The data on the displacement of surrounding sandy soil and axial force of adjacent piles induced by tunnel excavation were collected and analyzed by utilizing specially designed sensors and data collection and analysis software. Furthermore, the influence of pile length, pile diameter, pile-tunnel relative distance, and pile head load on surrounding sandy soil’s displacement caused by tunnel excavation was revealed, and the variation of axial force of adjacent piles caused by tunnel excavation with different pile lengths, pile diameters, and pile-tunnel relative distances was clarified. The relevant achievements can provide scientific guidance and practical support for disaster prevention and control of adjacent in-service piles during tunnel excavation in sand.</div></div>","PeriodicalId":56013,"journal":{"name":"Transportation Geotechnics","volume":"58 ","pages":"Article 101942"},"PeriodicalIF":5.5,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146190529","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Distribution and evolution of distress in embankment-bridge transition sections of the Gonghe–Yushu Expressway in degrading permafrost regions 退化多年冻土区共和-玉树高速公路路桥过渡段病害分布与演变

IF 5.5 2区工程技术 Q1 ENGINEERING, CIVIL

Transportation Geotechnics

Pub Date : 2026-03-01 Epub Date: 2026-02-10 DOI: 10.1016/j.trgeo.2026.101945

Bingyan Li , Minghao Liu , Yanhu Mu , Jing Luo , Xin Ju , Fei Yin , Fan Yu , Yunhui Huang

The Gonghe-Yushu Expressway (GYE) is the world’s first expressway constructed across a high-altitude permafrost region. Under the influence of climate warming and permafrost degradation, its embankment–bridge transition section (EBTS) is increasingly susceptible to structural deterioration. However, systematic investigations into EBTS distresses on permafrost expressways remained limited. This study conducted a field survey of 240 EBTSs in the permafrost zone of the GYE, employing an integrated method combining unmanned aerial vehicle and ground penetrating radar. The distribution characteristics and evolutionary mechanisms of EBTS distress in permafrost expressway were firstly elucidated, and a novel EBTS structure to mitigate such distress was proposed. The results indicate that EBTS distresses on the GYE can be classified into five primary types: uneven settlement, upheaval mound of the protection-cone, subsidence of the protection-cone, cracks of the protection-cone and dislocation between the wing walls and abutments. Over 90% of the surveyed EBTSs exhibit varying degrees of distress, with uneven settlement—typically less than 20 cm—being the most prevalent. These are predominantly located in the section extending from Maduo County to Bayan Har Mountain. High ground temperature and water accumulation beneath the bridge structure are identified as the primary factors contributing to settlement. Furthermore, EBTS distress follows a progressive evolution mechanism: it initiates with uneven pavement settlement, progresses to deformation of the protection cones, and ultimately leads to dislocation between wing walls and abutments. This study represents the first systematic analysis of EBTS distress characteristics and their developmental mechanisms in permafrost expressways, offering both a theoretical foundation and practical guidance for mitigating such issues in cold-region infrastructure engineering.

共和至玉树高速公路（GYE）是世界上第一条穿越高海拔永久冻土区的高速公路。在气候变暖和多年冻土退化的影响下，其路桥过渡段日益容易发生结构劣化。然而，对多年冻土高速公路的系统调查仍然有限。采用无人机与探地雷达相结合的综合方法，对GYE多年冻土带240个ebts进行了野外调查。首先阐述了冻土高速公路EBTS损伤的分布特征及演化机制，提出了一种新型的缓解EBTS损伤的结构。结果表明，GYE上的EBTS损伤可分为不均匀沉降、保护锥隆起、保护锥沉降、保护锥裂纹和翼墙与桥台错位5种主要类型。超过90%的被调查的ebts表现出不同程度的痛苦，最普遍的是不均匀的沉降——通常小于20厘米。这些主要分布在麻多县至巴颜喀山的区域。确定了高地温和桥下积水是导致沉降的主要因素。结果表明，EBTS损伤具有递进演化机制：从路面不均匀沉降开始，发展为保护锥变形，最终导致翼墙与桥台错位。本研究首次系统分析了冻土区高速公路EBTS损伤特征及其发展机制，为缓解冻土区基础设施工程中EBTS损伤问题提供了理论基础和实践指导。

{"title":"Distribution and evolution of distress in embankment-bridge transition sections of the Gonghe–Yushu Expressway in degrading permafrost regions","authors":"Bingyan Li , Minghao Liu , Yanhu Mu , Jing Luo , Xin Ju , Fei Yin , Fan Yu , Yunhui Huang","doi":"10.1016/j.trgeo.2026.101945","DOIUrl":"10.1016/j.trgeo.2026.101945","url":null,"abstract":"<div><div>The Gonghe-Yushu Expressway (GYE) is the world’s first expressway constructed across a high-altitude permafrost region. Under the influence of climate warming and permafrost degradation, its embankment–bridge transition section (EBTS) is increasingly susceptible to structural deterioration. However, systematic investigations into EBTS distresses on permafrost expressways remained limited. This study conducted a field survey of 240 EBTSs in the permafrost zone of the GYE, employing an integrated method combining unmanned aerial vehicle and ground penetrating radar. The distribution characteristics and evolutionary mechanisms of EBTS distress in permafrost expressway were firstly elucidated, and a novel EBTS structure to mitigate such distress was proposed. The results indicate that EBTS distresses on the GYE can be classified into five primary types: uneven settlement, upheaval mound of the protection-cone, subsidence of the protection-cone, cracks of the protection-cone and dislocation between the wing walls and abutments. Over 90% of the surveyed EBTSs exhibit varying degrees of distress, with uneven settlement—typically less than 20 cm—being the most prevalent. These are predominantly located in the section extending from Maduo County to Bayan Har Mountain. High ground temperature and water accumulation beneath the bridge structure are identified as the primary factors contributing to settlement. Furthermore, EBTS distress follows a progressive evolution mechanism: it initiates with uneven pavement settlement, progresses to deformation of the protection cones, and ultimately leads to dislocation between wing walls and abutments. This study represents the first systematic analysis of EBTS distress characteristics and their developmental mechanisms in permafrost expressways, offering both a theoretical foundation and practical guidance for mitigating such issues in cold-region infrastructure engineering.</div></div>","PeriodicalId":56013,"journal":{"name":"Transportation Geotechnics","volume":"58 ","pages":"Article 101945"},"PeriodicalIF":5.5,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146190532","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Upper-bound solutions for capacity of tracked vehicles on clay under fully three-dimensional loading 全三维荷载作用下履带车辆在粘土上承载能力的上界解

IF 5.5 2区工程技术 Q1 ENGINEERING, CIVIL

Transportation Geotechnics

Pub Date : 2026-03-01 Epub Date: 2026-01-29 DOI: 10.1016/j.trgeo.2026.101927

Dingtao Yan , Yue Yan , Dengfeng Fu , Dong Wang

This study develops novel upper-bound solutions for predicting the ultimate bearing capacity of tracked vehicles on clay under fully three-dimensional loading, encompassing vertical weight, horizontal traction/braking, moments, and torsion. A rigorously derived three-dimensional failure mechanism integrates the superposition of rotation-admissible Green mechanisms with two orthogonal variable cross-section planar velocity field, extending upper-bound limit analysis beyond conventional coplanar loading limitations. The dual tracks are idealized as rigid plates bonded to soil, with detachment prohibited. Velocity fields are optimized through several kinematic parameters to minimize internal energy dissipation across deformation zones and discontinuity surfaces. Validation against finite element analyses demonstrates good agreement for uniaxial capacities and failure envelopes across geometric configurations, specifically examining track length-to-width ratios from 6 to 10 and track spacing-to-width ratios from 3 to 5. The study establishes the inaugural rigorous analytical foundation for six-degree-of-freedom bearing capacity analysis of tracked vehicles, effectively balancing physical interpretability with engineering practicality.

本研究开发了新的上限解决方案，用于预测履带式车辆在全三维载荷下的粘土极限承载能力，包括垂直重量、水平牵引/制动、力矩和扭转。严格推导的三维破坏机制将两个正交变截面平面速度场与旋转允许格林机构的叠加相结合，将上限分析扩展到常规共面加载限制之外。双轨道是理想的刚性板粘在土壤，与分离禁止。速度场通过几个运动学参数进行优化，以减少变形区和不连续面的内部能量耗散。对有限元分析的验证表明，单轴能力和几何配置的失效包膜具有良好的一致性，特别是检查轨道长宽比为6到10，轨道间距比为3到5。该研究为履带车辆六自由度承载力分析奠定了严谨的分析基础，有效地平衡了物理可解释性与工程实用性。

{"title":"Upper-bound solutions for capacity of tracked vehicles on clay under fully three-dimensional loading","authors":"Dingtao Yan , Yue Yan , Dengfeng Fu , Dong Wang","doi":"10.1016/j.trgeo.2026.101927","DOIUrl":"10.1016/j.trgeo.2026.101927","url":null,"abstract":"<div><div>This study develops novel upper-bound solutions for predicting the ultimate bearing capacity of tracked vehicles on clay under fully three-dimensional loading, encompassing vertical weight, horizontal traction/braking, moments, and torsion. A rigorously derived three-dimensional failure mechanism integrates the superposition of rotation-admissible Green mechanisms with two orthogonal variable cross-section planar velocity field, extending upper-bound limit analysis beyond conventional coplanar loading limitations. The dual tracks are idealized as rigid plates bonded to soil, with detachment prohibited. Velocity fields are optimized through several kinematic parameters to minimize internal energy dissipation across deformation zones and discontinuity surfaces. Validation against finite element analyses demonstrates good agreement for uniaxial capacities and failure envelopes across geometric configurations, specifically examining track length-to-width ratios from 6 to 10 and track spacing-to-width ratios from 3 to 5. The study establishes the inaugural rigorous analytical foundation for six-degree-of-freedom bearing capacity analysis of tracked vehicles, effectively balancing physical interpretability with engineering practicality.</div></div>","PeriodicalId":56013,"journal":{"name":"Transportation Geotechnics","volume":"58 ","pages":"Article 101927"},"PeriodicalIF":5.5,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146189915","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Damage mechanism of high-pier high-speed railway track-bridge system under debris flow impact 泥石流冲击下高墩高速铁路轨道-桥梁体系损伤机理

IF 5.5 2区工程技术 Q1 ENGINEERING, CIVIL

Transportation Geotechnics

Pub Date : 2026-03-01 Epub Date: 2026-01-22 DOI: 10.1016/j.trgeo.2026.101911

Yujie Yu , Zhewei Fang , Yichuan Zhang , Zhipeng Lai , Lizhong Jiang

Debris flow disasters pose an increasing threat to bridges, but the damage effect of debris flow impact on high-speed railway track-bridge systems is still not fully understood. This study conducted a comprehensive investigation into the dynamic response, damage evolution, and failure sequence of a CRTS II slab track-bridge system with high piers under debris flow impact. The effects of varying debris flow velocities and impact heights on the damage modes of key structural components, including bridge piers, bearings, sliding layers, and rails, were analyzed in detail. Results indicated that the debris flow acted on the bridge system by inducing pier bending and excessive pier-top lateral deformation, which propagated upward to the bridge and track structures. Peak deformation envelopes along the bridge were generally symmetric. However, the system exhibited significant asymmetric damage and residual deformation, which were mainly attributed to the non-uniform constraint effects of shear alveolars. The fixed bearing at the abutment was prone to early failure, thereby leading to lateral movement of the main girder. Sliding layer damage was concentrated in areas near longitudinal sliding bearings without the shear alveolar. The rails showed asymmetric stepped deformation under the debris flow impacts. A moderate modification of shear alveolars can hardly alleviate the impact damage. Increasing the fixed bearing stiffness at the abutment can restrain the lateral movement of the girder and reduce abnormal rail irregularity.

泥石流灾害对桥梁的威胁越来越大，但泥石流对高速铁路轨道-桥梁系统的破坏作用尚未完全了解。本文对具有高桥墩的CRTS II型板式轨道-桥梁体系在泥石流冲击作用下的动力响应、损伤演化及破坏顺序进行了全面研究。详细分析了不同泥石流速度和冲击高度对桥墩、支座、滑动层和轨道等关键结构构件损伤模式的影响。结果表明：泥石流作用于桥梁体系的方式是引起桥墩弯曲和桥顶过度侧向变形，并向上传播至桥梁和轨道结构；沿桥的峰值变形包络大体上是对称的。然而，系统表现出明显的不对称损伤和残余变形，这主要归因于剪切肺泡的非均匀约束效应。桥台固定支座易早期失效，导致主梁侧移。滑动层损伤集中在无剪切槽的纵向滑动轴承附近区域。在泥石流冲击作用下，钢轨呈现不对称阶梯变形。对剪切肺泡进行适度的修饰几乎不能缓解冲击损伤。增加桥台固定支座刚度可以抑制梁侧移，减少钢轨异常不平顺。

{"title":"Damage mechanism of high-pier high-speed railway track-bridge system under debris flow impact","authors":"Yujie Yu , Zhewei Fang , Yichuan Zhang , Zhipeng Lai , Lizhong Jiang","doi":"10.1016/j.trgeo.2026.101911","DOIUrl":"10.1016/j.trgeo.2026.101911","url":null,"abstract":"<div><div>Debris flow disasters pose an increasing threat to bridges, but the damage effect of debris flow impact on high-speed railway track-bridge systems is still not fully understood. This study conducted a comprehensive investigation into the dynamic response, damage evolution, and failure sequence of a CRTS II slab track-bridge system with high piers under debris flow impact. The effects of varying debris flow velocities and impact heights on the damage modes of key structural components, including bridge piers, bearings, sliding layers, and rails, were analyzed in detail. Results indicated that the debris flow acted on the bridge system by inducing pier bending and excessive pier-top lateral deformation, which propagated upward to the bridge and track structures. Peak deformation envelopes along the bridge were generally symmetric. However, the system exhibited significant asymmetric damage and residual deformation, which were mainly attributed to the non-uniform constraint effects of shear alveolars. The fixed bearing at the abutment was prone to early failure, thereby leading to lateral movement of the main girder. Sliding layer damage was concentrated in areas near longitudinal sliding bearings without the shear alveolar. The rails showed asymmetric stepped deformation under the debris flow impacts. A moderate modification of shear alveolars can hardly alleviate the impact damage. Increasing the fixed bearing stiffness at the abutment can restrain the lateral movement of the girder and reduce abnormal rail irregularity.</div></div>","PeriodicalId":56013,"journal":{"name":"Transportation Geotechnics","volume":"58 ","pages":"Article 101911"},"PeriodicalIF":5.5,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146080421","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Influence of slaking behavior on the shear strength, swelling capacity, and crack evolution of mudstone 泥岩软化特性对泥岩抗剪强度、溶胀能力及裂缝演化的影响

IF 5.5 2区工程技术 Q1 ENGINEERING, CIVIL

Transportation Geotechnics

Pub Date : 2026-03-01 Epub Date: 2026-01-26 DOI: 10.1016/j.trgeo.2026.101919

Danxi Sun , Guojun Cai , Yiqing Sun , Yan Feng , Gaofeng Pan , Hao Wang , Qi Tao

Excavation of cut slopes and tunnels generates substantial quantities of mudstone waste. To reduce construction costs and accelerate project timelines, this waste material has been utilized as fill in expressway embankments. In this study, the engineering performance of mudstone waste was evaluated through a series of slaking, direct shear, swelling strain, and crack development tests. The experimental results demonstrate that vertical stress intensifies slaking behavior by promoting particle breakage. As slaking progresses, the shear strength of mudstone progressively decreases, primarily because the increasing fraction of fine particles disrupts the formation of load-bearing force chains between coarse grains. Swelling strain exhibits a nonmonotonic evolution: it initially decreases as particle breakage and rearrangement reduce the swelling capacity, but subsequently increases owing to the accumulation of finer particles with higher swelling potential. In addition, contacts between coarse and fine particles act as structural weak points that strongly influence crack propagation. The breakage of coarse particles during slaking process reduces the number of such weak interfaces and thereby modifies the crack pattern. Although the overall crack ratio remains constant, the cracks network undergoes a morphological transition towards shorter, wider cracks. These findings provide critical insight into the long-term deformation and failure mechanisms of embankments constructed with mudstone fill and offer a basis for the safe, efficient, and cost-effective utilization of mudstone waste in construction applications.

开挖斜坡和隧道会产生大量泥岩废物。为了降低建设成本和加快项目进度，这种废物已被用作高速公路路堤的填充物。通过一系列的熟化、直剪、膨胀应变和裂缝发育试验，对泥岩废弃物的工程性能进行了评价。实验结果表明，垂直应力通过促进颗粒破碎而加剧了颗粒的松弛行为。随着泥岩软化的进行，泥岩抗剪强度逐渐降低，其主要原因是细粒含量的增加破坏了粗粒间的承重力链的形成。膨胀应变表现出非单调的演化规律：最初随着颗粒破碎和重排降低膨胀能力而减小，但随后由于具有更高膨胀势的细颗粒的积累而增大。此外，粗颗粒和细颗粒之间的接触是影响裂纹扩展的结构弱点。松弛过程中粗颗粒的断裂减少了弱界面的数量，从而改变了裂纹的形态。尽管整体裂纹比保持不变，但裂纹网络经历了向更短、更宽裂纹的形态转变。这些发现为泥岩填筑堤防的长期变形和破坏机制提供了重要的见解，并为在建筑应用中安全、高效、经济地利用泥岩废物提供了基础。

{"title":"Influence of slaking behavior on the shear strength, swelling capacity, and crack evolution of mudstone","authors":"Danxi Sun , Guojun Cai , Yiqing Sun , Yan Feng , Gaofeng Pan , Hao Wang , Qi Tao","doi":"10.1016/j.trgeo.2026.101919","DOIUrl":"10.1016/j.trgeo.2026.101919","url":null,"abstract":"<div><div>Excavation of cut slopes and tunnels generates substantial quantities of mudstone waste. To reduce construction costs and accelerate project timelines, this waste material has been utilized as fill in expressway embankments. In this study, the engineering performance of mudstone waste was evaluated through a series of slaking, direct shear, swelling strain, and crack development tests. The experimental results demonstrate that vertical stress intensifies slaking behavior by promoting particle breakage. As slaking progresses, the shear strength of mudstone progressively decreases, primarily because the increasing fraction of fine particles disrupts the formation of load-bearing force chains between coarse grains. Swelling strain exhibits a nonmonotonic evolution: it initially decreases as particle breakage and rearrangement reduce the swelling capacity, but subsequently increases owing to the accumulation of finer particles with higher swelling potential. In addition, contacts between coarse and fine particles act as structural weak points that strongly influence crack propagation. The breakage of coarse particles during slaking process reduces the number of such weak interfaces and thereby modifies the crack pattern. Although the overall crack ratio remains constant, the cracks network undergoes a morphological transition towards shorter, wider cracks. These findings provide critical insight into the long-term deformation and failure mechanisms of embankments constructed with mudstone fill and offer a basis for the safe, efficient, and cost-effective utilization of mudstone waste in construction applications.</div></div>","PeriodicalId":56013,"journal":{"name":"Transportation Geotechnics","volume":"58 ","pages":"Article 101919"},"PeriodicalIF":5.5,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146080496","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dynamic approach-based assessment of debris flow susceptibility in the mountainous area of North China 基于动态方法的华北山区泥石流易感性评价

IF 5.5 2区工程技术 Q1 ENGINEERING, CIVIL

Transportation Geotechnics

Pub Date : 2026-03-01 Epub Date: 2026-01-20 DOI: 10.1016/j.trgeo.2026.101908

Bo Liu , Xueqiang Gong , Yonghao Zhou , Xiewen Hu , Kun He , Jian Cui

Debris flow susceptibility assessment is critical for mitigating risks to large-scale infrastructure, yet existing models often lack dynamic capability by relying solely on static environmental factors. This study identified six environmental factors most closely related to debris flows from 20 static factors, establishing a catchment intrinsic indicator (CII) to reflect debris flow propensity. By integrating CII with hourly rainfall intensity (I_60min), we developed a dynamic debris flow susceptibility model—the CII-I model. To demonstrate its applicability, the five rainfall scenarios corresponding to different return periods presented serve as applications. Results indicate that the CII-I model achieves an AUC of 0.926, outperforming Random Forest (RF, AUC = 0.861) and Support Vector Machine (SVM, AUC = 0.866). The high-susceptibility catchments are mainly concentrated in the K45–K65 section of the Fengsha railway (FSR), and all catchments are highly susceptible under the 100-year return period rainfall scenario, consistent with post-event field investigations. Overall, the CII-I model provides improved predictive performance and applicability, establishing a dynamic framework for susceptibility zoning under real rainfall events.

泥石流易感性评估对于降低大型基础设施的风险至关重要，但现有模型往往仅依赖静态环境因素，缺乏动态能力。本研究从20个静态因素中识别出与泥石流关系最密切的6个环境因素，建立了反映泥石流倾向性的流域内在指标（CII）。通过将CII与逐时降雨强度（I60min）相结合，建立了动态泥石流易感性模型——CII- i模型。为了证明其适用性，本文给出了对应于不同回归期的五种降雨情景作为应用。结果表明，ci - i - i模型的AUC为0.926，优于随机森林（RF, AUC = 0.861）和支持向量机（SVM, AUC = 0.866）。高易感流域主要集中在丰沙铁路k45 ~ k65段，在100年回归期降雨情景下，所有流域都是高易感流域，与事件发生后的野外调查结果一致。总体而言，ci - i - i模型提供了更好的预测性能和适用性，建立了真实降雨事件下敏感性分区的动态框架。

{"title":"Dynamic approach-based assessment of debris flow susceptibility in the mountainous area of North China","authors":"Bo Liu , Xueqiang Gong , Yonghao Zhou , Xiewen Hu , Kun He , Jian Cui","doi":"10.1016/j.trgeo.2026.101908","DOIUrl":"10.1016/j.trgeo.2026.101908","url":null,"abstract":"<div><div>Debris flow susceptibility assessment is critical for mitigating risks to large-scale infrastructure, yet existing models often lack dynamic capability by relying solely on static environmental factors. This study identified six environmental factors most closely related to debris flows from 20 static factors, establishing a catchment intrinsic indicator (CII) to reflect debris flow propensity. By integrating CII with hourly rainfall intensity (I<sub>60min</sub>), we developed a dynamic debris flow susceptibility model—the CII-I model. To demonstrate its applicability, the five rainfall scenarios corresponding to different return periods presented serve as applications. Results indicate that the CII-I model achieves an AUC of 0.926, outperforming Random Forest (RF, AUC = 0.861) and Support Vector Machine (SVM, AUC = 0.866). The high-susceptibility catchments are mainly concentrated in the K45–K65 section of the Fengsha railway (FSR), and all catchments are highly susceptible under the 100-year return period rainfall scenario, consistent with post-event field investigations. Overall, the CII-I model provides improved predictive performance and applicability, establishing a dynamic framework for susceptibility zoning under real rainfall events.</div></div>","PeriodicalId":56013,"journal":{"name":"Transportation Geotechnics","volume":"58 ","pages":"Article 101908"},"PeriodicalIF":5.5,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146039520","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

X-ray CT-based investigation of mesoscopic pore structure and macro-meso coupled damage model for anisotropic lean clay under a freeze–thaw cycle 冻融循环作用下各向异性贫黏土细观孔隙结构及宏细观耦合损伤模型的x射线ct研究

IF 5.5 2区工程技术 Q1 ENGINEERING, CIVIL

Transportation Geotechnics

Pub Date : 2026-03-01 Epub Date: 2026-02-07 DOI: 10.1016/j.trgeo.2026.101939

Yu Tang , Ping Yang , Jiahui Wang , Chang Huo

The mechanical properties of frozen soil in different orientations significantly affect both the strength of frozen walls and the stability assessment of subway shield-driven tunnels constructed through geological formations using artificial ground freezing (AGF) techniques. Given that such differences resulted from depositional conditions and the arrangement of skeleton particles within clay soils, it is essential to investigate the effect of anisotropy on the strength characteristics of sedimentary clay. This study investigates the influence of inherent anisotropy and freezing temperature on the mechanical characteristics of frozen lean clay. To reduce the randomness, discreteness inherent and improve repeatability in undisturbed soil sampling, an apparatus and its methodology were developed to prepare anisotropic clay specimens with controlled sampling angles (0°, 30°, 45°, 60° and 90°). Uniaxial compressive strength (UCS) tests were conducted under varying subzero temperatures, and results showed that UCS exponentially increased with the decreasing sampling angles. Three-dimensional (3D) computed tomography (CT) scanning technology was employed to reconstruct the pore structure of specimens, revealing the lowest porosity along the natural sedimentation direction and a nonlinear trend with the increasing sampling angle. Pore parameters, including equivalent radius, throat length, and coordination number, followed a normal distribution and exhibited obvious sampling angle-dependent variations. Furthermore, the influence of freeze–thaw (F–T) cycles on UCS, elastic modulus and porosity were quantified. The damage parameters were extracted using macroscopic elastic modulus and microscopic fractal dimension as independent variables, and a coupled macro-meso damage model was established. These findings provide an effective means to quantify the degree of deterioration in soils subjected to one F–T cycle, offering a precise basis for strength parameter determination, which is essential for structural safety design and stability evaluation in AGF-reinforced engineering applications.

不同方向冻土的力学特性对地下盾构隧道冻结墙强度及人工冻结稳定性评价均有显著影响。考虑到这种差异是由沉积条件和粘土骨架颗粒的排列造成的，研究各向异性对沉积粘土强度特性的影响是必要的。研究了固有各向异性和冻结温度对冷冻贫黏土力学特性的影响。为了降低原状土壤取样的随机性和离散性，提高取样的可重复性，研制了一种控制取样角度（0°、30°、45°、60°和90°）的各向异性粘土试样制备装置和方法。在不同的低温条件下进行了单轴抗压强度（UCS）试验，结果表明，随着采样角度的减小，单轴抗压强度呈指数增长。利用三维计算机断层扫描技术重建试样孔隙结构，发现孔隙度沿自然沉积方向最低，且随采样角度增大呈非线性趋势。等效半径、喉道长度、配位数等孔隙参数服从正态分布，且随采样角度变化明显。此外，还量化了冻融循环对复合材料UCS、弹性模量和孔隙率的影响。以宏观弹性模量和微观分形维数为自变量提取损伤参数，建立宏细观耦合损伤模型。这些发现为量化一次F-T循环下土体的劣化程度提供了有效手段，为确定强度参数提供了精确依据，这对agf加固工程中结构安全设计和稳定性评价至关重要。

{"title":"X-ray CT-based investigation of mesoscopic pore structure and macro-meso coupled damage model for anisotropic lean clay under a freeze–thaw cycle","authors":"Yu Tang , Ping Yang , Jiahui Wang , Chang Huo","doi":"10.1016/j.trgeo.2026.101939","DOIUrl":"10.1016/j.trgeo.2026.101939","url":null,"abstract":"<div><div>The mechanical properties of frozen soil in different orientations significantly affect both the strength of frozen walls and the stability assessment of subway shield-driven tunnels constructed through geological formations using artificial ground freezing (AGF) techniques. Given that such differences resulted from depositional conditions and the arrangement of skeleton particles within clay soils, it is essential to investigate the effect of anisotropy on the strength characteristics of sedimentary clay. This study investigates the influence of inherent anisotropy and freezing temperature on the mechanical characteristics of frozen lean clay. To reduce the randomness, discreteness inherent and improve repeatability in undisturbed soil sampling, an apparatus and its methodology were developed to prepare anisotropic clay specimens with controlled sampling angles (0°, 30°, 45°, 60° and 90°). Uniaxial compressive strength (UCS) tests were conducted under varying subzero temperatures, and results showed that UCS exponentially increased with the decreasing sampling angles. Three-dimensional (3D) computed tomography (CT) scanning technology was employed to reconstruct the pore structure of specimens, revealing the lowest porosity along the natural sedimentation direction and a nonlinear trend with the increasing sampling angle. Pore parameters, including equivalent radius, throat length, and coordination number, followed a normal distribution and exhibited obvious sampling angle-dependent variations. Furthermore, the influence of freeze–thaw (F–T) cycles on UCS, elastic modulus and porosity were quantified. The damage parameters were extracted using macroscopic elastic modulus and microscopic fractal dimension as independent variables, and a coupled macro-meso damage model was established. These findings provide an effective means to quantify the degree of deterioration in soils subjected to one F–T cycle, offering a precise basis for strength parameter determination, which is essential for structural safety design and stability evaluation in AGF-reinforced engineering applications.</div></div>","PeriodicalId":56013,"journal":{"name":"Transportation Geotechnics","volume":"58 ","pages":"Article 101939"},"PeriodicalIF":5.5,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146189907","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental study on macro-meso damage of jointed rock mass under sequential cyclic loading–unloading followed by freeze–thaw cycles 节理岩体在冻融循环加卸载序贯循环下的宏细观损伤试验研究

IF 5.5 2区工程技术 Q1 ENGINEERING, CIVIL

Transportation Geotechnics

Pub Date : 2026-03-01 Epub Date: 2026-01-29 DOI: 10.1016/j.trgeo.2026.101929

Junhao Wei , Shili Hu , Zhengding Deng , Guanshi Wang , Qiang Cheng , Yaojie Tu

Jointed rock mass in cold regions is often subjected to the sequential cyclic loading–unloading followed by freeze–thaw cycles. Studying the inductive correlation mechanism between the cyclic loading–unloading damage of jointed rock mass and subsequent freeze–thaw cycles is of great significance for the scientific evaluation of the long-term stability of related rock engineering projects. Sequential cyclic loading–unloading, freeze–thaw tests, and subsequent uniaxial loading were conducted on jointed rock masses, integrated with NMR, AE, and DIC monitoring, to examine how prior cyclic damage influences subsequent freeze–thaw damage and governs the macro- to meso-scale damage evolution under uniaxial loading. The results indicate that the impacts of the sequential effects of cyclic loading–unloading followed by freeze–thaw cycles on the evolution of rock mass pore structure exhibit significant scale differences. Cyclic loading–unloading primarily promote the emergence of micro- and small pores, while freeze–thaw cycles accelerate the expansion and connectivity of mesopores and macropores. Although cyclic loading–unloading have a limited impact on the overall porosity of the rock mass, the number of microscopic pores significantly increases. During the freeze‑thaw phase, frost‑heave pressure drives the interconnection and coalescence of micro‑pores, forming meso‑ and macro‑pores with increased susceptibility to frost‑heave damage, which in turn exacerbates the overall freeze‑thaw deterioration. During the stage of stable damage of the rock mass, energy and ringdown counts decrease with decreasing freezing temperature. At high levels of loading–unloading stress, the damage mechanism transitions from crack propagation to crack sliding, promoting more sudden failure. The freeze–thaw cycle dominates the process of deterioration of rock mass initiation strength and fracture toughness, and compressive strength also decreases accordingly with decreasing freezing temperature. Higher levels of macroscopic joint damage significantly reduce the peak strength of the rock mass and induce more pronounced mesoscale damage evolution under loading.

寒冷地区节理岩体经常经历连续的循环加卸载和冻融循环。研究节理岩体循环加卸载损伤与后续冻融循环的归纳关联机制，对科学评价相关岩体工程的长期稳定性具有重要意义。结合核磁共振、声发射和DIC监测，对节理岩体进行了顺序循环加载-卸载、冻融试验和随后的单轴加载，以研究单轴加载下，先前的循环损伤如何影响随后的冻融损伤，并控制宏观到细观尺度的损伤演化。结果表明：循环加载-卸载+冻融循环序贯效应对岩体孔隙结构演化的影响具有显著的尺度差异；循环加载卸载主要促进微孔和小孔的出现，冻融循环加速中孔和大孔的扩展和连通性。虽然循环加卸载对岩体整体孔隙度的影响有限，但微观孔隙数量显著增加。在冻融阶段，冻胀压力驱动微孔的相互连接和聚合，形成对冻胀损伤的敏感性增加的中、宏观孔，从而加剧了整体冻融恶化。在岩体稳定破坏阶段，能量和环衰次数随冻结温度的降低而降低。在高加载-卸载应力水平下，损伤机制由裂纹扩展转变为裂纹滑动，导致更为突然性的破坏。冻融循环在岩体起裂强度和断裂韧性退化过程中起主导作用，抗压强度也随冻结温度的降低而降低。较高的宏观节理损伤水平显著降低了岩体的峰值强度，并在加载作用下引起更明显的细观损伤演化。

{"title":"Experimental study on macro-meso damage of jointed rock mass under sequential cyclic loading–unloading followed by freeze–thaw cycles","authors":"Junhao Wei , Shili Hu , Zhengding Deng , Guanshi Wang , Qiang Cheng , Yaojie Tu","doi":"10.1016/j.trgeo.2026.101929","DOIUrl":"10.1016/j.trgeo.2026.101929","url":null,"abstract":"<div><div>Jointed rock mass in cold regions is often subjected to the sequential cyclic loading–unloading followed by freeze–thaw cycles. Studying the inductive correlation mechanism between the cyclic loading–unloading damage of jointed rock mass and subsequent freeze–thaw cycles is of great significance for the scientific evaluation of the long-term stability of related rock engineering projects. Sequential cyclic loading–unloading, freeze–thaw tests, and subsequent uniaxial loading were conducted on jointed rock masses, integrated with NMR, AE, and DIC monitoring, to examine how prior cyclic damage influences subsequent freeze–thaw damage and governs the macro- to <em>meso</em>-scale damage evolution under uniaxial loading. The results indicate that the impacts of the sequential effects of cyclic loading–unloading followed by freeze–thaw cycles on the evolution of rock mass pore structure exhibit significant scale differences. Cyclic loading–unloading primarily promote the emergence of micro- and small pores, while freeze–thaw cycles accelerate the expansion and connectivity of mesopores and macropores. Although cyclic loading–unloading have a limited impact on the overall porosity of the rock mass, the number of microscopic pores significantly increases. During the freeze‑thaw phase, frost‑heave pressure drives the interconnection and coalescence of micro‑pores, forming meso‑ and macro‑pores with increased susceptibility to frost‑heave damage, which in turn exacerbates the overall freeze‑thaw deterioration. During the stage of stable damage of the rock mass, energy and ringdown counts decrease with decreasing freezing temperature. At high levels of loading–unloading stress, the damage mechanism transitions from crack propagation to crack sliding, promoting more sudden failure. The freeze–thaw cycle dominates the process of deterioration of rock mass initiation strength and fracture toughness, and compressive strength also decreases accordingly with decreasing freezing temperature. Higher levels of macroscopic joint damage significantly reduce the peak strength of the rock mass and induce more pronounced mesoscale damage evolution under loading.</div></div>","PeriodicalId":56013,"journal":{"name":"Transportation Geotechnics","volume":"58 ","pages":"Article 101929"},"PeriodicalIF":5.5,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146189912","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0