Transportation Geotechnics最新文献_第3页

Dynamic stability and ballast movement characteristics of steep-gradient rack railway track under traction load 牵引荷载作用下大坡度轨道的动力稳定性及碴物运动特性

IF 5.5 2区工程技术 Q1 ENGINEERING, CIVIL

Transportation Geotechnics

Pub Date : 2026-01-03 DOI: 10.1016/j.trgeo.2026.101891

Jun Fang , Qiyu Zhao , Chunfa Zhao , Zaigang Chen , Jizhong Yang , Qian Xiao , Zhihui Chen , Guojun Yang

Mountainous rack railways face significant operational challenges on steep gradients, where the dynamic stability of ballasted tracks under traction loads is crucial to ensuring operational safety. Existing studies, mostly based on multibody dynamics or finite element methods, have limited capability in revealing the microscopic mechanical behavior of ballast. In this study, a coupled vehicle–track dynamic model for rack railways was developed. Fastener forces on the rail and rack were extracted using Simpack and subsequently applied to a 3-D discrete element model to simulate the structural response of the track. The model was validated against field measurements obtained from a 120 ‰ gradient section, and then employed to systematically analyze the dynamic response characteristics of the track under varying traction forces (50 %, 75 %, 100 %), vehicle loads (AW0–AW3), and gradients (50 ‰–400 ‰). Results indicate that traction force is the dominant factor governing the longitudinal response of the track; its increase markedly amplifies sleeper longitudinal displacement (up to 115 %) and ballast particle migration, far exceeding the vertical response (increase of 44.1 %). Moreover, the influence of rack bogies is greater than that of conventional wheel–rail systems. When the gradient exceeds 200‰, track dynamic responses deteriorate sharply, with sleeper longitudinal acceleration and inter-sleeper displacement difference increasing to 198.8 % and 187 %, respectively, and deep ballast movement becoming significantly intensified. Increased vehicle load primarily raises ballast contact forces and vertical sleeper displacement, with the most pronounced effects occurring beneath the rails. Ballast movement patterns exhibit marked spatial variability: beneath the rack, longitudinal downslope migration predominates, while beneath the rail, more complex local uplift and upslope movement trends are observed. This study elucidates the macro–micro dynamic response mechanisms of steep-gradient ballasted rack railway tracks under traction loads, highlighting the pronounced longitudinal force transmission and ballast instability risks when gradients exceed 200‰, and providing a theoretical basis for track structure optimization and refined maintenance strategies.

山地轨道铁路在陡坡上面临着巨大的运营挑战，有碴轨道在牵引载荷作用下的动力稳定性对确保运营安全至关重要。现有的研究大多基于多体动力学或有限元方法，在揭示压载物微观力学行为方面能力有限。本文建立了轨道交通车辆-轨道耦合动力学模型。利用Simpack提取轨道和机架上的扣件力，并将其应用于三维离散单元模型，模拟轨道的结构响应。利用120‰坡度断面实测数据对模型进行验证，系统分析了不同牵引力（50%、75%、100%）、车辆荷载（aw0 ~ aw3）、坡度（50‰~ 400‰）下的轨道动态响应特性。结果表明：牵引力是控制轨道纵向响应的主导因素；它的增加显著放大了轨枕的纵向位移（高达115%）和压载物颗粒的迁移，远远超过了垂直响应（增加44.1%）。此外，齿条转向架的影响比传统轮轨系统的影响更大。当坡度超过200‰时，轨道动力响应急剧恶化，轨枕纵向加速度和轨枕间位移差分别增大到198.8%和187%，深砟运动明显加剧。增加的车辆负荷主要增加了压舱物接触力和垂直轨枕位移，其中最明显的影响发生在铁轨下方。道砟运动模式表现出明显的空间变异性：道架下方以纵向下坡运动为主，而道轨下方则以较为复杂的局部隆升和上坡运动趋势为主。本研究阐明了大坡度有轨铁路轨道在牵引荷载作用下的宏观微观动力响应机制，突出了坡度超过200‰时显著的纵向力传递和道砟失稳风险，为轨道结构优化和精细化养护策略提供了理论依据。

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引用次数: 0

Stability of water-resistant rock mass of fault tunnels under high-temperature and high-pressure conditions 高温高压条件下断层隧道抗水岩体稳定性研究

IF 5.5 2区工程技术 Q1 ENGINEERING, CIVIL

Transportation Geotechnics

Pub Date : 2026-01-03 DOI: 10.1016/j.trgeo.2026.101893

Chengping Zhang, Shiqin Tu, Tongxin Liu, Wei Li

The high-temperature water inrush geo-hazards are often encountered during the construction of deep tunnels recently. The stability of the water-resistant rock mass of tunnel face under the high-temperature and high-pressure conditions plays an important role for the prevention of water inrush disaster, which has been paid little attention to in existing researches. In order to investigate the stability of water-resistant rock mass of water-rich fault tunnels under high temperature and high pressure conditions, a thermal–hydraulic-mechanical coupled model is established to simulate the failure of water-resistant rock mass during the tunnel excavation. Then a series of experiments are conducted using the self-developed model test device of tunnel water inrush with high temperature and high pressure. The validity of the numerical model is proved by comparing the results obtained from model test and numerical simulation. The results show that the thermal–mechanical coupling effect not only intensifies the instability of surrounding rock but also redirects the failure kinematics of water-resistant rock mass, resulting a more significant downward deflection of the velocity of failure zone. In addition, the thermal–mechanical or thermal–hydraulic-mechanical coupling effects significantly alter the stress path at which the water-resistant rock mass reaches the failure state, while the hydraulic-mechanical coupling effect merely accelerates the failure of the water-resistant rock mass along the original stress path. The results of this study can provide useful guidance for preventing water inrush of deep tunnels in water-rich stratum with high temperature and pressure.

近年来，深埋隧道施工中经常遇到高温突水地质灾害。高温高压条件下隧洞工作面抗水岩体的稳定性对突水灾害的防治具有重要作用，但在现有研究中很少受到重视。为了研究高温高压条件下富水断层隧道抗水岩体的稳定性，建立了热-水-力耦合模型，模拟了隧道开挖过程中抗水岩体的破坏。然后利用自行研制的隧道高温高压突水模型试验装置进行了一系列试验。通过对比模型试验和数值模拟结果，验证了数值模型的有效性。结果表明：热-力耦合效应不仅加剧了围岩的不稳定性，而且改变了抗水岩体的破坏运动学方向，导致破坏区速度向下偏转更为明显；此外，热-力耦合效应或热-水-力耦合效应显著改变了阻水岩体到达破坏状态的应力路径，而水-力耦合效应仅加速了阻水岩体沿原应力路径的破坏。研究结果可为高温高压富水地层深部隧道防突水提供有益的指导。

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引用次数: 0

Mechanisms of failure and permeability evolution in gas-bearing strata under tunnel-induced stress paths 隧道应力路径下含气岩层破坏与渗透率演化机制

IF 5.5 2区工程技术 Q1 ENGINEERING, CIVIL

Transportation Geotechnics

Pub Date : 2026-01-03 DOI: 10.1016/j.trgeo.2026.101892

Jiafeng Tan , Deyi Jiang , Rong Liu , Yi He , Jinyang Fan , Jianyu Liang , Cheng Qian , Hanlin He , Hong Zheng

The potential danger of tunnel gas hazards increases with the complexity of geological conditions, resulting in major casualties, huge economic losses and seriously affecting the normal construction progress of tunnels. Addressing the core issues of the lagging nature of static prediction and the weak mechanistic research in dynamic models in existing early warning methods, a new idea of gas disaster early warning that integrates geological damage evolution and multi-physics coupling is proposed. Based on the coal-rock damage-seepage synergistic evolution mechanism, a multi-field coupled control equation considering dynamic excavation effect, Klinkenberg effect and gas desorption characteristics was constructed, and a damage-seepage coupled numerical model was established based on COMSOL. By simulating the whole excavation process of the tunnel through the coal, the spatial and temporal evolution of the gas dynamic outflow is revealed: with the increase of the excavation distance, the gas pressure perturbation shows obvious nonlinear characteristics, and the cumulative outflow is regulated by the multifactorial nonlinearities of the coal seam gas pressure, the thickness of the coal seam, the depth of the tunnel, and the excavation step spacing. Engineering validation demonstrates that the model has a prediction average relative error rate of 2.1%, which is considered to be an effective reflection of the gas outflow pattern in actual projects. The resultant framework provides a mechanism-rich yet practical tool for dynamic risk assessment of gas disasters in deep tunnels, with direct implications for the development of reliable early-warning systems.

隧道瓦斯灾害的潜在危险性随着地质条件的复杂性而增加，造成重大人员伤亡和巨大经济损失，严重影响隧道的正常施工进度。针对现有预警方法中静态预测的滞后性和动态模型机理研究薄弱的核心问题，提出了地质损伤演化与多物理场耦合相结合的瓦斯灾害预警新思路。基于煤岩损伤-渗流协同演化机制，构建了考虑动态开挖效应、Klinkenberg效应和气体解吸特性的多场耦合控制方程，并基于COMSOL软件建立了损伤-渗流耦合数值模型。通过模拟巷道穿越煤层的整个开挖过程，揭示了瓦斯动态流出的时空演化规律：随着开挖距离的增加，瓦斯压力摄动表现出明显的非线性特征，累计流出受煤层瓦斯压力、煤层厚度、巷道深度、开挖步距的多因子非线性调节。工程验证表明，该模型预测的平均相对错误率为2.1%，可以有效地反映实际工程中的瓦斯流出模式。由此产生的框架为深部隧道瓦斯灾害动态风险评估提供了一个机制丰富而实用的工具，对开发可靠的早期预警系统具有直接意义。

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引用次数: 0

Internal instability evolution mechanism of tunnel face in sand-clay composite strata: Transparent soil model tests and DEM simulations 砂-粘土复合地层隧道工作面内部失稳演化机制：透明土模型试验与DEM模拟

IF 5.5 2区工程技术 Q1 ENGINEERING, CIVIL

Transportation Geotechnics

Pub Date : 2026-01-01 DOI: 10.1016/j.trgeo.2025.101840

Yingnan Liu , Huayang Lei , Mengting Wang , Hongwei Huang

Tunnel face stability plays a decisive role in construction safety, particularly in sand-clay composite strata where the risks are significantly heightened. A thorough understanding of the instability evolution mechanism is therefore essential. Existing studies have not adequately revealed the internal instability evolution process under such composite strata conditions. In this study, accurately formulated transparent soil was employed in model tests at ambient temperature of 20 °C and constant humidity of 60 % RH, combined with discrete element method (DEM) simulations, to investigate the failure modes, evolution process, support pressure, and soil arching effect of tunnel face in sand-clay composite strata. The results demonstrate that the failure mode shows a basin-shaped global failure under shallow burial conditions, while a teardrop-shaped local failure under deep burial conditions. The soil arching effect restrains failure propagation toward the ground surface. Three critical ratios of tunnel face movement (s) to tunnel diameter (D) were identified at s/D = 3.0 %, 6.0 %, and 12.0 %, corresponding to initial instability, accelerated instability, and complete instability, respectively. The support pressure variation resembles that observed in pure clay, characterized by a rapid decline phase followed by a slow decline phase, with their intersection defining the limit support pressure. At the microscopic level, the deflection of principal stress direction dominates the soil arching effect. The arching zone in the composite strata spans approximately 0.94D. Furthermore, the soil arching effect intensifies as the stratum interface locates closer to the tunnel. The findings in this paper provide theoretical and practical insights into instability mechanisms and safety control for shield tunnelling in sand-clay composite strata.

巷道工作面稳定性对施工安全起着决定性的作用，特别是在砂-粘土复合地层中，其危险性显著增加。因此，对不稳定演化机制的透彻理解是至关重要的。现有研究尚未充分揭示这种复合地层条件下的内部失稳演化过程。采用精确配制的透明土，在20℃环境温度、60% RH恒湿条件下进行模型试验，结合离散元法（DEM）模拟，研究砂-粘土复合地层中隧道工作面破坏模式、演化过程、支护压力及土拱效应。结果表明：在浅埋条件下，破坏模式表现为盆状整体破坏，而在深埋条件下，破坏模式表现为泪滴状局部破坏。土拱效应抑制了破坏向地表的传播。在s/D = 3.0%、6.0%和12.0%时，确定了3个隧道工作面移动与隧道直径的临界比(s /D = 3.0%、6.0%和12.0%，分别对应初始失稳、加速失稳和完全失稳。支护压力变化与纯粘土相似，先是快速下降阶段，然后是缓慢下降阶段，两者的交集确定了极限支护压力。微观层面上，主应力方向的偏转主导着土拱效应。复合地层中的拱带跨度约为0.94 4d。土层界面越靠近隧道，土拱效应越强。本文的研究结果为砂-粘土复合地层盾构隧道失稳机理和安全控制提供了理论和实践指导。

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引用次数: 0

Study on vibration-propagation law and vibration-velocity-prediction model for dynamic compaction under complex terrains 复杂地形下强夯振动传播规律及振动速度预测模型研究

IF 5.5 2区工程技术 Q1 ENGINEERING, CIVIL

Transportation Geotechnics

Pub Date : 2026-01-01 DOI: 10.1016/j.trgeo.2025.101825

Xiong Qiao, Sen Wang

Dynamic compaction is commonly employed for improving soft-soil foundations. However, the intense vibrations generated during compaction can negatively affect nearby structures, causing foundation settlement and structural cracks. Therefore, understanding the vibration-propagation patterns and predicting the vibration velocity under complex terrain conditions are essential for mitigation of vibration impacts. In this work, numerical simulations and field monitoring are used to analyze how the vibration velocity diminishes with distance. A prediction model for the peak surface-vibration velocity across complex terrains is created using dimensional analysis and validated via field measurements. The results show that: (1) Vibration propagation is notably directional. The peak vibration velocities in the X (direction of the vibration source) and Z (vertical direction) directions are significantly higher than that in the Y (direction perpendicular to the x-direction) direction, with more consistent patterns. (2) Wavelet packet analysis of vibration signals indicates that vibrations between 0 and 8 Hz account for 99.29 % of the energy, with the energy being concentrated at the slope shoulder. (3) Comparisons between predicted and actual vibration velocities reveal relative errors below 15 %, demonstrating strong agreement. (4) The model indicates positive relationships between the vibration velocity and terrain-fluctuation magnitude, as well as the vibration velocity and compaction energy level. A negative relationship exists between the vibration velocity and distance. These findings align well with the measured data.

强夯法是加固软土地基的常用方法。然而，在压实过程中产生的强烈振动会对附近的结构产生负面影响，引起基础沉降和结构裂缝。因此，了解复杂地形条件下的振动传播模式和预测振动速度对于减轻振动影响至关重要。本文采用数值模拟和现场监测相结合的方法，分析了振动速度随距离的衰减规律。利用量纲分析建立了复杂地形表面振动速度峰值的预测模型，并通过现场测量进行了验证。结果表明：(1)振动传播具有明显的方向性。 X （振源方向）和Z（垂直方向）方向的峰值振动速度显著高于Y（垂直于X方向）方向，且模式更加一致。(2)振动信号的小波包分析表明，0 ~ 8 Hz的振动占能量的99.29 %，能量集中在坡肩处。(3)预测振动速度与实际振动速度的比较表明，相对误差小于15 %，具有很强的一致性。(4)振动速度与地形起伏幅度、振动速度与压实能级呈正相关。振动速度与距离呈负相关。这些发现与实测数据非常吻合。

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引用次数: 0

Mechanical properties of a reinforced clay subgrade: Experimental investigation and mathematical modelling of fibre distribution patterns 增强粘土路基的力学特性：纤维分布模式的实验研究和数学模型

IF 5.5 2区工程技术 Q1 ENGINEERING, CIVIL

Transportation Geotechnics

Pub Date : 2026-01-01 DOI: 10.1016/j.trgeo.2025.101836

Komeil Rajaee , Ehsan Yaghoubi , Fazlollah Soltani , Foad Ghasemi

In this research, a low-plasticity clay soil was reinforced by polypropylene and recycled kenaf fibres. Seven symmetrical fibre distribution patterns (FDPs) were proposed to evaluate the effect of FDPs and the type of fibre on the mechanical properties of the reinforced soil. Prepared cylindrical samples comprised 5 layers and contained 1 % by weight (wt) of fibre. However, the fibre content of individual layers varied symmetrically in the range of 0.4 % to 2 %wt, depending on the adopted FDP. A series of unconfined compressive strength (UCS) tests was carried for the assessment of mechanical properties. Furthermore, the effectiveness of combinations of individual layers with various FDPs on mechanical properties and deformability of the whole specimen structure was determined using a mathematical model. The experimental results showed that fibres led to a decrease in the secant modulus of elasticity, as well as a remarkable improvement in the UCS (up to 82 %) and deformability (up to 175 %) of the unreinforced soil. Variations in the fibre content of different layers affected the deformability and mechanical properties of the reinforced samples. Some of the proposed FDPs (F3, F5, and F7) resulted in specimens with greater strengths up to 8.8 % compared to the control samples, which contained uniform fibre content in all their layers (F1). While confirming the experimental results, the outcomes of mathematical modelling indicated that as distance from the edges towards the mid-point of the sample’s height increased, there was a progressive increment in the effectiveness of layers on the deformability and mechanical characteristics of the specimen. Outcomes of this study, facilitates the identification of subgrade’s specific depths/layers which require more attention during ground improvement activities.

采用聚丙烯和再生红麻纤维对低塑性粘土进行加固。提出了7种对称纤维分布模式（FDPs），以评价FDPs和纤维类型对加筋土力学性能的影响。制备的圆柱形样品由5层组成，含有1%重量（重量）的纤维。然而，根据采用的FDP，各个层的纤维含量在0.4%至2% wt的范围内对称变化。进行了一系列无侧限抗压强度（UCS）试验，以评估其力学性能。此外，使用数学模型确定了具有不同fdp的单个层组合对整个试件结构的力学性能和变形能力的有效性。试验结果表明，加筋后，未加筋土的割线弹性模量降低，单轴抗剪强度提高82%，可变形性提高175%。不同层间纤维含量的变化影响了增强试样的变形性能和力学性能。一些建议的fdp （F3， F5和F7）与所有层中纤维含量均匀的对照样品相比，产生了更高的强度，高达8.8% （F1）。在证实实验结果的同时，数学模型的结果表明，随着边缘到试样高度中点的距离增加，层对试样变形能力和力学特性的影响逐渐增加。这项研究的结果有助于确定地基改善活动中需要注意的具体深度/层数。

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引用次数: 0

Construction and Validation of a ResNet-Based Ballast Bed State Recognition Network 基于resnet的压载床状态识别网络的构建与验证

IF 5.5 2区工程技术 Q1 ENGINEERING, CIVIL

Transportation Geotechnics

Pub Date : 2026-01-01 DOI: 10.1016/j.trgeo.2025.101839

Zemin Zhao, Lihua Wang, Wei Jiang, Hao Zhang, Miaoyu Zhao

Dynamic track stabilization (DTS) is essential for maintaining ballast beds and improving track stability. However, accurately identifying the “stable/unstable” states of the ballast bed during operation remains challenging, and traditional offline inspections can cause significant delays. To address this, this study proposes a ballast bed state recognition method utilizing a residual neural network (ResNet). It uses sleeper lateral acceleration signals as input, preprocesses them with Finite Impulse Response (FIR) band-pass filtering, and creates time–frequency image features through the Transient Extraction Transform (TET). These features are then combined with ballast compaction and stabilization parameters. The model employs a shared encoder and uses a combined weighted multi-task loss function. This loss function merges the classification cross-entropy with the settlement and lateral resistance regression losses, and applies dynamic weighting based on the GradNorm technique. This approach balances multi-task training and enhances the model’s robustness under different operational conditions. A total of 864 samples (605/173/86 for training/validation/test) are used for model training and evaluation. Results show that the ResNet18 model achieves 96.71% accuracy on the validation set, and the binary classification accuracy on the test set exceeds 98%, as shown by the confusion matrix. Compared to DenseNet201, training time is reduced by 77.26% under the same conditions, leading to a 340.9% increase in training efficiency. A field engineering case further demonstrates that the proposed model can accurately identify ballast bed states during DTS, with recognition results consistent with engineering criteria, indicating strong potential for practical application.

动态轨道稳定是维护道床、提高轨道稳定性的重要手段。然而，在运行过程中，准确识别镇流器床的“稳定/不稳定”状态仍然具有挑战性，传统的离线检查可能会造成严重的延误。为了解决这个问题，本研究提出了一种利用残差神经网络（ResNet）的压载床状态识别方法。它以卧铺横向加速度信号为输入，用有限脉冲响应（FIR）带通滤波对其进行预处理，并通过瞬态提取变换（TET）产生时频图像特征。然后将这些特征与压载压实和稳定参数相结合。该模型采用共享编码器和组合加权多任务损失函数。该损失函数将分类交叉熵与沉降和侧向阻力回归损失相结合，并应用基于GradNorm技术的动态加权。该方法平衡了多任务训练，增强了模型在不同操作条件下的鲁棒性。总共864个样本（605/173/86用于训练/验证/测试）用于模型训练和评估。结果表明，ResNet18模型在验证集上的准确率达到96.71%，在测试集上的二元分类准确率超过98%，如混淆矩阵所示。与DenseNet201相比，在相同条件下，训练时间减少了77.26%，训练效率提高了340.9%。现场工程实例进一步表明，该模型能够准确识别DTS过程中的压载床状态，识别结果符合工程标准，具有较强的实际应用潜力。

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引用次数: 0

CFD-DEM investigation into multi-mode evolutionary mechanisms of underground seepage erosion 地下渗流侵蚀多模态演化机制的CFD-DEM研究

IF 5.5 2区工程技术 Q1 ENGINEERING, CIVIL

Transportation Geotechnics

Pub Date : 2026-01-01 DOI: 10.1016/j.trgeo.2025.101838

Xue-Liang Zhang , Dong-Mei Zhang , Zhong-Kai Huang , Xiao-Chuang Xie , Jie Yang

In the context of seepage erosion induced by damage to underground structures, the transformation from suffusion to leakage (referred to as a suffusion catastrophe) is a particularly typical and complex phenomenon that warrants increased attention. However, current research on the two erosional behaviours remains largely isolated, resulting in an inadequate understanding of the underlying mechanisms driving suffusion catastrophe and thus a lack of its equation description. Together with the existing theoretical shortcomings in the governing equations of suffusion and leakage respectively, these limitations hinder the effective application of continuum medium theory to accurately simulate the entire process of large-scale seepage erosion phenomenon. In view of this, based on the principle of representative volume element (RVE), this study adopts the well-validated CFD-DEM method to simulate a series of erosion unit tests that require only conventional computational costs. Through upscaling of particle-scale microscopic data, three common erosional modes are revealed: stable suffusion, catastrophic suffusion, and continuous leakage. Correspondingly, the governing equations, comprising the suffusion critical equation, suffusion constitutive equation, catastrophe critical equation and catastrophe constitutive equation, are determined to enable a closed-loop description of these erosional modes. Additionally, the erosional correlation of fundamental physical quantities is analysed, and further the physical principles and mathematical structures of governing equations are clarified by establishing mechanical models based on conceptions of suffusion and leakage resistances. This study provides a conceptual framework and logical derivation pathway for establishment of erosion governing equations in the future.

在地下结构破坏引起渗流侵蚀的情况下，从渗透到泄漏的转变（即渗透突变）是一种特别典型和复杂的现象，值得重视。然而，目前对这两种侵蚀行为的研究在很大程度上仍然是孤立的，导致对驱动渗透灾难的潜在机制的理解不足，因此缺乏其方程描述。再加上扩散控制方程和泄漏控制方程各自存在的理论缺陷，这些局限性阻碍了连续介质理论在精确模拟大规模渗流侵蚀现象全过程中的有效应用。鉴于此，本研究基于代表性体积元（representative volume element， RVE）原理，采用经过验证的CFD-DEM方法，对一系列侵蚀单元试验进行模拟，只需常规计算成本。通过对颗粒尺度微观数据的放大，揭示了三种常见的侵蚀模式：稳定扩散、突变扩散和连续泄漏。相应地，确定了控制方程，包括扩散临界方程、扩散本构方程、突变临界方程和突变本构方程，以实现对这些侵蚀模式的闭环描述。此外，分析了基本物理量的侵蚀相关性，并进一步通过建立基于渗透阻力和泄漏阻力概念的力学模型，阐明了控制方程的物理原理和数学结构。本研究为今后建立侵蚀控制方程提供了概念框架和逻辑推导途径。

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引用次数: 0

Non-Isothermal Mechanical Response of Clayey Sands 粘性砂的非等温力学响应

IF 5.5 2区工程技术 Q1 ENGINEERING, CIVIL

Transportation Geotechnics

Pub Date : 2026-01-01 DOI: 10.1016/j.trgeo.2025.101833

Yang Xiao , Tingting Zhang , Qingyun Fang , Ninghao Wang , Shuang Liu , Hanlong Liu

The mechanical characteristics of clayey sands are crucial for evaluating behaviors pertinent to temperature-related geotechnical engineering. The undrained triaxial shear response of clayey sands, characterized by a constant skeleton void ratio, is experimentally investigated under varying fines contents, temperatures, and initial mean effective stresses. The effects of fines content and temperature on heating induced volumetric strain, peak deviatoric stress, peak excess pore water pressure, stress ratio at the undrained instability state, and collapsibility index are comprehensively investigated. Furthermore, a unified critical state line is proposed in the equivalent intergranular void ratio versus mean effective stress plane for clean sands, sand-slit mixtures, and sand-clay mixtures, irrespective of temperature. Additionally, the equivalent intergranular state parameter can be utilized to predict the mechanical responses of binary mixtures under both undrained instability state and critical state. It is valuable to use the equivalent skeleton void ratio to assess the stability in thermally influenced geotechnical engineering involving binary mixtures, particularly sand-dominated mixtures.

粘土砂的力学特性对于评价与温度相关的岩土工程行为至关重要。在不同细粒含量、温度和初始平均有效应力条件下，研究了具有恒定骨架孔隙比特征的粘土砂的不排水三轴剪切响应。研究了细粒含量和温度对热致体积应变、峰值偏应力、峰值超孔隙水压力、不排水失稳状态应力比和湿陷性指数的影响。此外，对于洁净砂、砂缝混合物和砂粘土混合物，在不考虑温度的情况下，提出了等效晶间空隙比与平均有效应力面的统一临界状态线。此外，等效晶间状态参数可用于预测二元混合物在不排水失稳状态和临界状态下的力学响应。利用等效骨架空隙比来评价二元混合物，特别是含砂混合物的热影响岩土工程的稳定性是有价值的。

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引用次数: 0

Sustainable subgrade reinforcement using areca fiber-reinforced soil: mechanical behavior and carbon emission evaluation 槟榔纤维增强土可持续加固路基：力学行为与碳排放评价

IF 5.5 2区工程技术 Q1 ENGINEERING, CIVIL

Transportation Geotechnics

Pub Date : 2026-01-01 DOI: 10.1016/j.trgeo.2025.101830

Zhizao Bao , Peng Chen , Xiaohua Bao , Jun Shen , Hongzhi Cui , Xiangsheng Chen

To address the dual challenges of areca waste disposal and subgrade performance enhancement, this study explores the feasibility of using areca fibers (AFs) as a sustainable reinforcement material for soft clay in transportation infrastructure. A series of consolidated undrained (CU) triaxial shear tests and cyclic triaxial tests were conducted to evaluate the static and dynamic behavior of AFs-reinforced soils under varying compaction conditions. In addition, a life cycle assessment (LCA) based carbon–force integrated evaluation model was established to quantify the carbon reduction benefits of AFs-reinforced soil in subgrade replacement applications. Experimental results show that under high compaction conditions, incorporating 2% AFs increases the shear strength of soil by 17% and the secant modulus by 65%. Under cyclic loading, the inclusion of AFs effectively restrains particle displacement and improves the dynamic stability of the soil. The LCA results indicate that AFs-reinforced soil achieves a carbon emission reduction exceeding 8.1% during the material production and construction stages, demonstrating clear environmental advantages. Comprehensive evaluation results reveal that soil reinforced with 2% AFs achieves the best balance between mechanical performance and carbon emissions, making it a promising alternative for sustainable subgrade engineering. This study offers both theoretical insights and practical guidance for the resource utilization of areca waste in geotechnical engineering, with a particular focus on its application in sustainable subgrade construction using AFs-reinforced soils.

为了解决槟榔废弃物处理和提高路基性能的双重挑战，本研究探讨了在交通基础设施中使用槟榔纤维（AFs）作为软粘土可持续增强材料的可行性。通过一系列固结不排水（CU）三轴剪切试验和循环三轴试验，对不同压实条件下afs加筋土的静动力特性进行了评价。此外，建立了基于生命周期评价（LCA）的碳力综合评价模型，量化了afs加筋土在路基置换应用中的减碳效益。试验结果表明，在高压实条件下，添加2%的AFs可使土体抗剪强度提高17%，割线模量提高65%。循环荷载作用下，AFs的加入有效抑制了颗粒位移，提高了土体的动力稳定性。LCA结果表明，afs加筋土在材料生产和施工阶段的碳减排超过8.1%，具有明显的环境优势。综合评价结果表明，2% AFs加筋土在力学性能和碳排放之间达到了最佳平衡，是一种很有前景的可持续路基工程替代方案。本研究为槟榔废弃物在岩土工程中的资源化利用，特别是在afs加筋土可持续路基建设中的应用提供了理论见解和实践指导。

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