Geotextiles and Geomembranes最新文献_第9页

Prediction method for lateral deformation of PVD-improved ground under vacuum preloading 真空预压下pvd加固地基侧向变形预测方法

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-04-05 DOI: 10.1016/j.geotexmem.2025.03.008

Fang Xu , Junfang Yang , Qichang Wu , Qi Yang , Yitian Lu , Wenqian Hao

A series of finite element analyses, conducted on the basis of modified triaxial tests incorporating radial drainage, were carried out to investigate the lateral deformation and stress state characteristics of prefabricated vertical drain (PVD) unit cells under vacuum preloading. The analyses revealed that the inward horizontal strain of the unit cell increases approximately linearly with the vacuum pressure (P_v) but decreases non-linearly with an increase in the initial vertical effective stress (σ′_v0). The variations in the effective stress ratio, corresponding to the median excess pore water pressure during vacuum preloading of the PVD unit cell, were elucidated in relation to the P_v and σ′_v0 using the simulation data. Relationships were established between the normalized horizontal strain and normalized effective stress ratio, as well as between the normalized stress ratio and a composite index parameter that quantitatively captures the effects of vacuum pressure, initial effective stress, and subsoil consolidation characteristics. These relationships facilitate the prediction of lateral deformation in PVD-improved grounds subjected to vacuum preloading, utilizing fundamental preloading conditions and soil properties. Finally, the proposed methodology was applied to analyze two field case histories, and its validity was confirmed by the close correspondence between the predicted and measured lateral deformation.

在径向排水改进三轴试验的基础上，开展了一系列有限元分析，研究了真空预压下预制垂直排水（PVD）单元格的侧向变形和应力状态特征。结果表明，随着真空压力（Pv）的增大，单晶胞内水平应变近似线性增加，而随着初始垂直有效应力（σ ' v0）的增大，单晶胞内水平应变呈非线性减小。利用模拟数据分析了真空预压过程中有效应力比（即超孔隙水压力中值）与Pv和σ ' v0的关系。建立归一化水平应变与归一化有效应力比之间的关系，以及归一化应力比与定量捕捉真空压力、初始有效应力和地基固结特征影响的复合指标参数之间的关系。利用基本的预压条件和土壤特性，这些关系有助于预测真空预压下pvd改良地基的侧向变形。最后，将该方法应用于两个现场实例的分析，结果表明，该方法的有效性得到了验证。

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引用次数: 0

Connection failure between reinforcement and facing in geosynthetic reinforced soil bridge abutments: A case study 土工合成加筋土桥台配筋与桥面连接失效案例研究

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-03-30 DOI: 10.1016/j.geotexmem.2025.03.009

Qiangqiang Huang , Xueyu Geng , Feifan Ren

Geosynthetic-reinforced soil (GRS) bridge abutments are increasingly used in transportation engineering. However, limited research has been conducted on the failure mechanisms of GRS bridge abutments, particularly the connection failures between reinforcement and facing. In this study, large-scale model tests were carried out to investigate the impact of connection failure between reinforcement and facing on the overall stability of GRS bridge abutments. The tests focused on a weaker connection configuration using low-strength cable ties subjected to high vertical loads. Photographic analysis was employed to document deformation and failure processes, while additional data were collected via sensors to monitor settlement, lateral displacement, and strain behavior during loading. The results indicated that inadequate connections between reinforcement and facing could result in progressive deformation, panel detachment, backfill leakage, and collapse under high loads. These findings underscore the importance of a strong connection between reinforcement and facing for maintaining structural stability. To address these issues, improved measures were proposed and validated, demonstrating significant enhancements in load-bearing performance and resilience.

土工合成材料加固土（GRS）桥墩在交通工程中的应用越来越广泛。然而，有关土工合成材料加固桥台失效机理的研究，尤其是加固层与面层之间的连接失效的研究还很有限。在本研究中，我们进行了大规模的模型试验，以研究钢筋和面层之间的连接失效对 GRS 桥墩整体稳定性的影响。测试主要针对在高垂直荷载下使用低强度拉索的较弱连接结构。采用照片分析记录变形和失效过程，同时通过传感器收集其他数据，以监测加载期间的沉降、横向位移和应变行为。结果表明，在高荷载作用下，钢筋和面层之间的连接不足会导致渐进变形、面板脱落、回填渗漏和坍塌。这些发现强调了钢筋和面层之间牢固连接对于保持结构稳定性的重要性。为解决这些问题，我们提出了改进措施并进行了验证，结果表明这些措施显著提高了承重性能和回弹性。

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引用次数: 0

Study on the dynamic performance of heavy-load railway reinforced subgrade under flood condition 洪水条件下重载铁路加筋路基动力性能研究

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-03-30 DOI: 10.1016/j.geotexmem.2025.03.005

Lihua Li, Kai Sun, Mengqian Xu, Henglin Xiao, Shuguang Jiang

To mitigate the subgrade deterioration induced by water infiltration, geosynthetics are employed to reinforce overloaded railway subgrades. Indoor model experiments were conducted to simulate dynamic loads under different axle weights, investigating the impacts of immersion on the dynamic characteristics of reinforced subgrades. Results demonstrated that immersion significantly increased the subgrade's stress, settlement, and acceleration. Compared to submerged unreinforced subgrades after immersion, the geocell-reinforced subgrade exhibited a 33 % reduction in additional stress, while the composite-reinforced subgrade, comprising geocell and geotextile, exhibited a 35 % decrease. The geotextile was placed beneath the ballast layer, with the geocell positioned below the geotextile. Additionally, settlement at the middle sleeper was reduced by 29 % for the geocell-reinforced subgrade under 30 t load and 38 % for the composite-reinforced subgrade, demonstrating that reinforcement enhanced subgrade strength, stabilized the upper structure, and mitigated subgrade acceleration. After immersion, geotextiles play a crucial role in maintaining the integrity of the ballast layer and minimizing ballast contamination. A modified model for the additional stress distribution within the ballast layer has been proposed, whereby the additional stress at any point outside the projected surface of the ballast layer can be calculated based on the distances from both the side and front of the sleeper.

为减轻渗水对路基造成的劣化，采用土工合成材料对超载铁路路基进行加固。通过室内模型试验，模拟不同轴重下的动荷载，研究浸没对加筋路基动力特性的影响。结果表明，浸没显著增加了路基的应力、沉降和加速度。与淹没后的未加筋路基相比，土工格室加筋路基的附加应力降低了33%，而由土工格室和土工织物组成的复合加筋路基的附加应力降低了35%。土工织物放置在压舱物层下方，土工室位于土工织物下方。此外，土工格室加筋地基在30 t荷载下，中间轨枕处的沉降减少了29%，复合加筋地基减少了38%，表明加筋增强了路基强度，稳定了上部结构，减轻了路基加速度。浸没后的土工布在保持道砟层的完整性和减少道砟污染方面起着至关重要的作用。本文提出了一种修正的碴层内附加应力分布模型，根据距轨枕侧面和正面的距离，可以计算出碴层投影面外任意点的附加应力。

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引用次数: 0

Comparative numerical analysis of anti-liquefaction in sandy soil reinforced with OSC and GESC under sinusoidal loading 正弦荷载作用下盐砂和GESC加筋沙土抗液化的数值对比分析

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-03-29 DOI: 10.1016/j.geotexmem.2025.03.007

Xiaocong Cai , Ling Zhang , Zijian Yang , Binbing Mao

Three-dimensional numerical models are developed to investigate the anti-liquefaction of ordinary (OSCs) and geosynthetic-encased (GESCs) stone columns in sandy soil under sinusoidal loading using the fluid-solid coupling method. The validated models capture and compare the vertical and radial deformation, excess pore water pressure (EPWP), and vertical effective stress of OSC, GESC, and sandy soil. Furthermore, ten essential factors are selected to conduct the parametric study. Numerical results reveal that GESC is more suitable for improving sandy soil and resisting dynamic load considering the deformation and EPWP. The bulging deformation is no longer the primary reason for failure. The partial encasement (e.g., 1-2D, D = column diameter) and short floating and end-bearing GESCs (e.g., 1-2.5D) are not recommended for reinforcing the sandy soil. GESC is more sensitive to low-frequency and high-amplitude loads, with shear and bending, whereas displays a block movement under higher frequency and lower amplitude loading. The change in loading amplitude is more disadvantageous to GESC than loading frequency. GESC with a large diameter cannot effectively resist the dynamic loads.

采用流固耦合方法，建立了砂质土中普通石柱和包覆土工合成石柱在正弦荷载作用下的抗液化三维数值模型。验证模型捕获并比较了盐砂、GESC和沙土的垂直和径向变形、超孔隙水压力（EPWP）和垂直有效应力。进而选取10个要素进行参数化研究。数值结果表明，考虑变形和EPWP， GESC更适合改良砂土和抵抗动荷载。胀形变形不再是破坏的主要原因。不建议采用局部围封（例如，1-2D, D =柱径）和短浮动和端承GESCs（例如，1-2.5D）来加固沙土。GESC对剪切和弯曲等低频和高幅值荷载更为敏感，而在高频和低幅值荷载下则表现为块体运动。加载幅值的变化比加载频率的变化更不利于GESC。较大直径的GESC不能有效抵抗动载荷。

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引用次数: 0

Model tests on wicking geosynthetic composite reinforced bases over weak subgrade 软弱地基上吸湿土工合成复合材料加筋地基模型试验

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-03-28 DOI: 10.1016/j.geotexmem.2025.03.006

Minghao Liu , Jiming Liu , Sam Bhat , Yongxuan Gao , Cheng Lin

Road performance is significantly enhanced by incorporating geosynthetics through their reinforcement and drainage functions. This study introduces a novel geosynthetic that integrates these functions. It is made of biaxial polypropylene geogrids heat-bonded to wicking nonwoven geotextiles (WNWGs). WNWGs are chemically treated to be hydrophilic and thus possess rapid wetting and wicking properties while preserving the large lateral drainage functionality of conventional nonwoven geotextiles. To assess the combined reinforcement and drainage performance of this material, a series of model tests including rainfall simulation and plate loading tests were performed on the WNWG-geogrid composite reinforced bases over weak subgrade using a customized model test apparatus. The results confirmed that the inclusion of wicking geosynthetic composite significantly enhanced drainage, stiffness, and bearing capacity of road bases compared to the conventional nonwoven geotextile-geogrid reinforcement and the unreinforced condition. The modulus improvement factor (MIF) for this wicking composite was 2.74 as compared to 1.46 for the conventional nonwoven geotextile-geogrid reinforcement. The findings from this study demonstrate the promising performance of this new composite and provide a valuable reference for full-scale tests and applications on roads.

土工合成材料的加固和排水功能大大提高了道路性能。本研究介绍了一种集成了这些功能的新型土工合成材料。它是由双轴聚丙烯土工格栅热粘合到吸芯非织造土工布（WNWGs）。WNWGs经过化学处理，具有亲水性，因此具有快速润湿和排芯性能，同时保留了传统非织造土工布的大侧向排水功能。为了评估该材料的综合配筋和排水性能，使用定制的模型试验装置对弱路基上的wnwg -土工格栅复合地基进行了降雨模拟和板载试验等一系列模型试验。结果证实，与常规非织造土工布-土工格栅加固和未加筋条件相比，加入吸芯土工合成复合材料显著提高了道路基层的排水能力、刚度和承载能力。这种吸芯复合材料的模量改善系数（MIF）为2.74，而传统的非织造土工布-土工格栅增强材料的模量改善系数为1.46。研究结果证明了这种新型复合材料的良好性能，并为全面测试和道路应用提供了有价值的参考。

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引用次数: 0

Critical state mechanics-based arching model for pile-supported embankments 基于临界状态力学的桩基路堤拱模型

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-03-26 DOI: 10.1016/j.geotexmem.2025.03.002

Tuan A. Pham , Abdollah Tabaroei , Daniel Dias , Jie Han

The study and application of soil arching theory in geosynthetic-reinforced pile-supported (GRPS) embankments have gained increasing attention, as accurate arching estimation significantly influences load-deflection behavior of structures. While most existing models rely on Rankine's earth pressure theory, which applies primarily to granular soils and neglects cohesion effects. This paper employs three-dimensional numerical simulations to examine the impact of soil cohesion on soil arching mechanisms in pile-supported embankments. Results indicate that cohesion enhances load transfer to piles, with arching efficacy increasing nonlinearly before stabilizing at higher cohesion values. Building on these findings, the ground reaction curve (GRC) model is proposed to predict arching behavior in both cohesive and non-cohesive embankments at various deformation stages. By integrating critical state soil mechanics with the concentric arch model, the transition between maximum and critical arching states is captured through changes in the mobilized friction angle with relative displacement. Model validation against two well-instrumented case studies demonstrates its accuracy, particularly in accounting for soil cohesion. Moreover, the maximum arching model better predicts GRPS embankments under small deformations (relative displacement <4 %), while the critical arching model is more suitable for large deformations (relative displacement >6 %). The proposed model effectively captures arching behavior improvements in both cohesive and non-cohesive soils.

土拱理论在土工合成桩支撑（GRPS）路堤中的研究和应用越来越受到重视，因为准确的土拱估算对结构的荷载-挠曲行为有重要影响。而现有的大多数模型依赖于Rankine土压力理论，该理论主要适用于颗粒土而忽略了粘聚效应。本文采用三维数值模拟的方法研究了土体粘聚力对桩基路堤土拱机制的影响。结果表明：粘聚力增强了荷载向桩的传递，在较高的粘聚力值下，拱效率呈非线性增长，趋于稳定；在此基础上，提出了地基反力曲线（GRC）模型来预测粘性和非粘性路堤在不同变形阶段的拱行为。将临界状态土力学与同心拱模型相结合，通过动员摩擦角随相对位移的变化来捕捉最大拱状态与临界拱状态之间的过渡。模型验证对两个良好的仪器案例研究证明了其准确性，特别是在考虑土壤凝聚力。最大拱模型较好地预测了小变形（相对位移>； 4%）下的GRPS路堤，而临界拱模型更适合于大变形（相对位移>； 6%）下的GRPS路堤。所提出的模型有效地捕捉了粘性和非粘性土壤中拱行为的改善。

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引用次数: 0

Consolidation of slurry treated by PHDs-VP incorporating development process of clogged zone 含堵塞区发展过程的ph - vp处理浆体固结

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-03-22 DOI: 10.1016/j.geotexmem.2025.03.003

Kang Yang , Mengmeng Lu , Kuo Li , Xiusong Shi

The prefabricated horizontal drains combined with vacuum preloading (PHDs-VP) method exhibits significant benefits in dredged slurry treatment. This study introduces an analytical model of slurry consolidation treated by PHDs-VP. In this model, the PHD is treated as a permeable boundary with a vacuum pressure. The governing equations are established by dividing the analytical unit into normal zone and clogged zone, and by incorporating the development process of the clogged zone. Numerical solutions are obtained utilizing the finite difference method. The accuracy and reliability of the solutions are validated through both degradation analysis and experimental verification. Furthermore, a parametrical analysis is conducted to investigate the influence of several key parameters on consolidation behavior. The results indicate that the clogging effect significantly retards the consolidation process, with a lower permeability coefficient or a greater thickness of the clogged zone resulting in a more pronounced reduction in the consolidation rate. Additionally, the consolidation rate decreases with the accelerated development of the clogged zone, and this effect becomes more pronounced with denser PHDs layout.

预制水平排水管结合真空预压（ph - vp）方法在疏浚泥浆处理中具有显著的效果。介绍了ph - vp处理浆体固结的分析模型。在该模型中，将PHD视为具有真空压力的可渗透边界。将分析单元划分为正常区和堵塞区，结合堵塞区的发展过程，建立了控制方程。利用有限差分法得到了数值解。通过退化分析和实验验证，验证了解的准确性和可靠性。此外，还进行了参数分析，探讨了几个关键参数对固结行为的影响。结果表明：堵塞效应显著延缓了固结过程，渗透系数越低或堵塞区厚度越大，固结速率降低越明显；此外，固结速率随着堵塞区发育的加快而降低，并且随着博士层的密集，这种影响更加明显。

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引用次数: 0

The effect of a bench on leakage through a cover: A field and numerical assessment 台架对盖层渗漏的影响：现场与数值评估

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-03-15 DOI: 10.1016/j.geotexmem.2025.02.005

Y.H. Fan , R. Kerry Rowe , R.W.I. Brachman , Jamie F. VanGulck

Field experiments are conducted to quantify the leakage through an 11-mm-diameter hole in the liner on slopes with and without a bench under waste cover conditions. Over 14 months, with a total precipitation of 947 mm, a 0.68 m bench on a 4H: 1V slope results in a 43-fold increase in leakage (from 6.5 L to 282 L) compared to the reference section without a bench. Substantial leakage is attributed to snowmelt occurring at low temperatures. 3D numerical modelling is conducted and shows good agreement with the measured leakage induced by both rainfall and snowmelt. Parametric studies are conducted to further analyze the impact of hole locations, slope length, and slope gradient on leakage. The validated numerical model is used to predict potential leakage in a real case scenario, which features benches formed by differential settlement observed after 3-year service as a landfill cover. This paper contributes to enhancing leakage prediction so as to optimize the design of slope and bench configurations in waste covers.

通过现场试验，量化了垃圾覆盖条件下，在有垫层和没有垫层的斜坡上，衬里直径11 mm孔的泄漏量。在14个月的时间里，总降水量为947毫米，在4H: 1V的斜坡上，0.68米的工作台与没有工作台的参考区域相比，漏水量增加了43倍（从6.5升增加到282升）。大量泄漏归因于低温下发生的融雪。三维数值模拟结果与实测的降水和融雪引起的渗漏量吻合较好。进行参数化研究，进一步分析孔位、坡长、坡坡度对渗漏的影响。验证的数值模型用于预测实际情况下的潜在泄漏，其特征是作为垃圾填埋场覆盖3年后观测到的差异沉降形成的长凳。本文有助于加强渗漏预测，从而优化垃圾填埋场坡面和台架配置的设计。

引用次数: 0

Shear behavior of saline soil-geotextile interfaces under freeze-thaw cycles 冻融循环作用下盐渍土-土工织物界面剪切特性

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-03-10 DOI: 10.1016/j.geotexmem.2025.03.001

Junli Gao, Lai Pan, Feiyu Liu, Yan Yang

Volume changes in soil caused by freeze-thaw cycles can affect the shear performance of the saline soil-geotextile interface. To investigate this issue, the study examined changes in shear strength, deformation characteristics, and failure modes of the saline soil-geotextile interface under different numbers of freeze-thaw cycles. The experimental results indicate that with the increase in freeze-thaw cycles, the shear stiffness of the interface initially increases and then decreases, demonstrating the reduction in elasticity and resistance to deformation caused by freeze-thaw cycles. And the enhancement of normal stress can effectively increase the density of the soil and the adhesion at the interface, thereby improving shear stiffness. Meanwhile, the salt content in the soil also significantly impacts the mechanical properties, with notable changes in the dynamic characteristics of the interface as the salt content varies. Furthermore, after freeze-thaw actions, the soil becomes loose, reduces in integrity, features uneven surfaces, and sees increased internal porosity leading to slip surfaces. Trend analysis from this study provides new insights into the failure mechanisms at the saline soil-geotextile interface.

冻融循环引起的土体体积变化会影响盐渍土-土工织物界面的抗剪性能。为此，研究了不同冻融循环次数下盐渍土-土工织物界面抗剪强度、变形特征和破坏模式的变化。试验结果表明，随着冻融循环次数的增加，界面剪切刚度先增大后减小，表明冻融循环导致的弹性和抗变形能力降低。法向应力的增强可以有效地增加土的密度和界面黏附，从而提高抗剪刚度。同时，土壤含盐量对力学性能也有显著影响，界面动态特性随着含盐量的变化而发生显著变化。此外，在冻融作用后，土壤变得松散，完整性降低，表面不均匀，内部孔隙度增加导致表面滑动。本研究的趋势分析为盐渍土-土工织物界面破坏机制的研究提供了新的思路。

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引用次数: 0

Influence of rainfall and drying periods on the performance of a large-scale segmental GRS wall model built with poorly draining local soil 降雨和干燥期对局部排水差的大尺度分段式GRS墙体模型性能的影响

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-03-09 DOI: 10.1016/j.geotexmem.2025.02.003

M.C. Santos , Yoo C , F.H.M. Portelinha

The use of poorly draining local soils as backfill material in geosynthetic reinforced soil walls has become a common practice despite the known risks. With climate change effects, it is crucial to understand how these structures will perform under such extreme conditions. In this study, the performance of a large-scale model of a modular block geogrid-reinforced soil wall, using fine-grained backfill material, is evaluated under varying simulated rainfall intensities and drying periods. The model was constructed in a laboratory environment, enabling the implementation of an extensive instrumentation program designed to monitor soil suction, volumetric water content, and the resulting deformation and reinforcement strains. Tensile loads mobilized by the geogrid within the backfill soil and at the connection with block wall facing are discussed in the paper. The study demonstrates the satisfactory performance of a poorly draining reinforced soil wall even after prolonged and intense simulated rainfall. The low hydraulic conductivity of the well-compacted backfill soil, combined with significant surface runoff, helped maintain low levels of soil suction which reflects in apparent cohesion. Drying periods led to varying but significant rates of suction recovery influenced by rainfall-drying patterns. The findings indicate that rainfall intensities of 10 mm/h (240 mm/day) for over 7 days were insufficient to fully eliminate suction in a poorly draining geogrid-reinforced wall.

使用排水差的当地土壤作为土工合成加筋土墙的回填材料已经成为一种常见的做法，尽管已知的风险。由于气候变化的影响，了解这些结构在这种极端条件下的表现是至关重要的。在这项研究中，采用细粒回填材料的模块化块格土工格栅加筋土墙的大尺度模型在不同的模拟降雨强度和干燥时间下的性能进行了评估。该模型是在实验室环境中构建的，可以实施广泛的仪器程序，用于监测土壤吸力、体积含水量以及由此产生的变形和加固应变。本文讨论了土工格栅在回填土内及与砌块墙接头处所调动的拉伸荷载。研究表明，在长时间的强模拟降雨作用下，疏水性较差的加筋土墙仍具有良好的性能。压实良好的回填土的低水力导率，加上大量的地表径流，有助于保持较低的土壤吸力水平，这反映在表观粘聚性上。干燥期导致受降雨干燥模式影响的吸力恢复速率变化但显著。研究结果表明，持续7天以上的10毫米/小时（240毫米/天）降雨强度不足以完全消除排水差的土工格栅加筋墙的吸力。

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引用次数: 0