Geotextiles and Geomembranes最新文献_第7页

Chemical-enhanced electrokinetic geosynthetics (EKG) electro-osmosis combined with vacuum preloading for consolidation and copper remediation in contaminated dredged sludge 化学增强电动土工合成（EKG）电渗透结合真空预压在污染疏浚污泥中的固结和铜修复

IF 6.2 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-12-01 Epub Date: 2025-08-25 DOI: 10.1016/j.geotexmem.2025.08.008

Yang Shen , Nihao Wei , Kewei Fan , Wencheng Qi , Jianting Feng , Zhiqiang Lai

Chemical-enhanced electrokinetic geosynthetics (EKG) electro-osmosis combined with vacuum preloading was employed to simultaneously consolidate and remediate copper-contaminated dredged sludge. Five chemical additives—citric acid, tartaric acid, hydrogen peroxide, rhamnolipids, and sodium chloride—were systematically evaluated via model tests. Results show that all additives improve both drainage and copper removal, with sodium chloride exhibited the enhancement in dewatering performance, while rhamnolipid achieved the highest copper removal efficiencies. Mechanistic analysis revealed that chemical additives improved sludge dewatering by enhancing pore water migration—through modifying soil structure, increasing ionic conductivity, or reducing surface tension. They also promoted copper removal by altering speciation: acidic chelating agents reduced pH and stabilized Cu²⁺ in soluble complexes, suppressing precipitation, while in near-neutral conditions, cathodic OH⁻ dissolved Cu(OH)₂ into mobile species, facilitating transport. Energy analysis confirmed that chemical-enhanced systems improved the energy efficiency of copper removal. These findings support the integrated use of EKG electro-osmosis combined with vacuum preloading, coupled with appropriate chemical agents, as a viable and energy-efficient strategy for the remediation of heavy metal-contaminated dredged sludge.

采用化学增强电动土工合成材料（EKG）电渗透与真空预压相结合的方法，对铜污染的疏浚污泥进行了同步固结和修复。五种化学添加剂——柠檬酸、酒石酸、过氧化氢、鼠李糖脂和氯化钠——通过模型试验进行了系统的评价。结果表明，各添加剂均能提高脱铜效果，其中氯化钠对脱铜效果有增强作用，鼠李糖脂的脱铜效果最好。机理分析表明，化学添加剂通过改变土壤结构、增加离子电导率或降低表面张力来增强孔隙水迁移，从而改善污泥脱水。它们还通过改变形态来促进铜的去除：酸性螯合剂降低pH值，稳定可溶性配合物中的Cu2+，抑制沉淀，而在接近中性的条件下，阴极OH−将Cu(OH)2溶解成可移动的形态，促进运输。能量分析证实，化学增强系统提高了除铜的能源效率。这些发现支持将心电图电渗透与真空预压相结合，再加上适当的化学剂，作为一种可行且节能的策略来修复重金属污染的疏浚污泥。

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引用次数: 0

Geogrid stabilization effectiveness – Comprehensive assessment through multiscale experiments with bender element sensor technology 土工格栅稳定效果——弯曲单元传感器技术多尺度试验综合评价

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-12-01 Epub Date: 2025-06-07 DOI: 10.1016/j.geotexmem.2025.05.006

Han Wang , Youngdae Kim , Mingu Kang , Erol Tutumluer , Heather Shoup

Geogrids are commonly used in pavement structures to mechanically stabilize unbound aggregate layers to improve structural performance and extend lifespan. Geogrids stabilize aggregate particles by restraining their lateral movements through mechanisms such as interlocking and friction. This paper presents a multiscale experimental study conducted on extruded and welded geogrids, having different aperture shapes and properties, for their stabilization effectiveness through quantifying modulus enhancement using the bender element (BE) sensor technology. The study examines geogrid-stabilized aggregates both in a large-scale testbed with three embedded BE field sensors and in a repeated load triaxial device with geogrid coupons installed at midheight and embedded BE sensor pairs above geogrids. The large-scale testbed allowed lateral pressure measurements under a series of loading and unloading stages. Small strain moduli from the shear wave measurements determined from both experiments quantified geogrid stiffened zones when tested with the same dense-graded aggregates. All four geogrids showed modulus enhancements in both test setups when compared to control test results. The geogrid mechanical stabilization influence zone was observed to be as large as 6 in. (15 cm) above one extruded geogrid. Such quantified modulus enhancements and influence zones are essential for incorporating geogrid into mechanistic-empirical (M-E) pavement design framework.

土工格栅通常用于路面结构，以机械稳定松散的骨料层，以提高结构性能和延长使用寿命。土工格栅通过诸如联锁和摩擦等机制来抑制聚合粒子的横向运动，从而稳定聚合粒子。本文采用弯曲单元（BE）传感器技术对不同孔径形状和性能的挤压和焊接土工格栅进行了多尺度试验研究，通过量化模量增强来研究土工格栅的稳定效果。该研究对土工格栅稳定聚集体进行了研究，包括在大型试验台上安装了三个嵌入式BE现场传感器，以及在重复加载三轴装置中安装了土工格栅，并在土工格栅上方嵌入了BE传感器对。大型测试平台允许在一系列加载和卸载阶段进行侧压力测量。当使用相同的密级集料进行测试时，从两个实验中确定的剪切波测量的小应变模量量化了土工格栅的加筋区。与对照测试结果相比，所有四个土工格栅在两个测试设置中都显示出模量增强。观察到土工格栅力学稳定影响区最大可达6 in。（15厘米）以上一个挤压土工格栅。这种量化的模量增强和影响区域对于将土工格栅纳入力学-经验（M-E）路面设计框架至关重要。

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引用次数: 0

Investigation on the effect of interface temperature on soil-reinforcement interaction mechanism by pullout test 通过拉拔试验研究界面温度对土-筋相互作用机理的影响

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-12-01 Epub Date: 2025-06-11 DOI: 10.1016/j.geotexmem.2025.06.002

Huaxin Han , Chengzhi Xiao , Jianguang Yin , Yonghua Cao

To investigate the effect of interface temperature on the soil-reinforcement interaction mechanism, a series of pullout tests were conducted considering different types of reinforcement (geogrid and non-woven geotextile), backfill (dry sand, wet sand, and clay), and six interface temperatures. The test results indicate that at interface temperatures of 0 °C and above, reinforcement failure didn't occur during the pullout tests, whereas it predominantly occurred at subzero temperatures. Besides, the pullout resistance for the same soil-reinforcement interface gradually decreased as the interface temperature rose. At a given positive interface temperature, the pullout resistance between wet sand and reinforcement was significantly higher than that of the clay-reinforcement interface but lower than that of the dry sand-reinforcement interface. Compared with geotextile reinforcements, geogrids were more difficult to pull out under the same interface temperature and backfill conditions. In addition, the lag effect in the transfer of tensile forces within the reinforcements was significantly influenced by the type of soil-reinforcement interface and the interface temperature. Finally, the progressive deformation mechanism along the reinforcement length at different interface temperatures was analyzed based on the strain distribution in the reinforcement.

为了研究界面温度对土-筋相互作用机制的影响，进行了一系列考虑不同类型加筋（土工格栅和无纺布）、回填体（干砂、湿砂和粘土）和6种界面温度的拉拔试验。试验结果表明，在0℃及以上界面温度下，拉拔试验中不发生钢筋破坏，而在零下温度下主要发生钢筋破坏。随着界面温度的升高，同一土加固界面的拉拔阻力逐渐减小。在一定的正界面温度下，湿砂-钢筋界面的拉拔阻力显著高于粘土-钢筋界面，而低于干砂-钢筋界面。在相同的界面温度和回填条件下，土工格栅比土工布加筋更难以拔出。此外，筋土界面类型和界面温度对筋土内部拉力传递的滞后效应有显著影响。最后，根据钢筋内部的应变分布，分析了不同界面温度下沿钢筋长度方向的渐进变形机制。

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引用次数: 0

Laboratory validation of seismic damage assessment in reinforced soil models based on sensor-enabled piezoelectric geogrids (SPGG) 基于传感器压电土工格栅（SPGG）的加筋土模型震害评估实验室验证

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-12-01 Epub Date: 2025-06-07 DOI: 10.1016/j.geotexmem.2025.05.007

Jun Wang, Zhiqiang Xiang, Hongtao Fu, Yu Rao, Ziyang Gao, Junfeng Ni

Earthquakes are common geological disasters, and slopes under seismic loading can trigger coseismic landslides, while also becoming unstable due to accumulated damage caused by the seismic activity. Reinforced soil slopes are widely used as seismic-resistant geotechnical systems. However, traditional geosynthetics cannot sense internal damage in reinforced soil systems, and existing in-situ distributed monitoring technologies are not suitable for seismic conditions, thus limiting accurate post-earthquake stability assessments of slopes. This study presents, for the first time, the use of a batch molding process to fabricate self-sensing piezoelectric geogrids (SPGG) for distributed monitoring of soil behavior under seismic conditions. The SPGG's reinforcement and damage sensing abilities were verified through model experiments. Results show that SPGG significantly enhances soil seismic resistance and can detect soil failure locations through voltage distortions. Additionally, the tensile deformation of the reinforcement material can be quantified with sub-centimeter precision by tracking impedance changes, enabling high-precision distributed monitoring of reinforced soil under seismic conditions. Notably, when integrated with wireless transmission technology, the SPGG-based monitoring system offers a promising solution for real-time monitoring and early warning in road infrastructure, where rapid detection and response to seismic hazards are critical for mitigating catastrophic outcomes.

地震是常见的地质灾害，地震荷载作用下的边坡会引发同震滑坡，同时也会因地震活动造成的累积破坏而变得不稳定。加筋土边坡是一种广泛应用的抗震岩土工程体系。然而，传统的土工合成材料无法感知加筋土体系的内部损伤，现有的原位分布式监测技术也不适合地震条件，从而限制了对边坡的准确震后稳定性评估。本研究首次提出了使用批量成型工艺制造自传感压电土工格栅（SPGG），用于地震条件下土壤行为的分布式监测。通过模型实验验证了SPGG的加固和损伤感知能力。结果表明，SPGG能显著提高土体的抗震性能，并能通过电压畸变检测土体的破坏位置。此外，通过对阻抗变化的跟踪，可实现对加筋材料拉伸变形的亚厘米级量化，实现对地震条件下加筋土的高精度分布式监测。值得注意的是，当与无线传输技术相结合时，基于spgg的监测系统为道路基础设施的实时监测和预警提供了一种很有前景的解决方案，在道路基础设施中，快速检测和响应地震灾害对于减轻灾难性后果至关重要。

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引用次数: 0

Centrifuge modelling of EPS geofoam behind integral bridge abutments 整体式桥台后EPS土工泡沫的离心建模

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-12-01 Epub Date: 2025-07-17 DOI: 10.1016/j.geotexmem.2025.07.005

Douglas G. Morley , Gopal SP. Madabhushi , Dennis Sakufiwa

This research investigates the extent to which geosynthetic compressible inclusions can be used to improve the performance of integral bridges. Geotechnical centrifuge modelling was used to simulate thermal movements acting on a 9 m abutment on a spread foundation, with and without a 1.2 m thick EPS geofoam inclusion. The compressible inclusion was found to significantly reduce the earth pressures behind the abutment generated over a 120-year design life of thermal cycles without undergoing notable permanent deformation. This resulted in the bridge deck axial force and peak abutment bending moment reaching only a third and two-thirds, respectively, of the values without the geofoam. Backfill settlement increased slightly when the compressible inclusion was used, although the peak settlement immediately behind the abutment face remained similar at around 100 mm. Through the application of extreme displacement amplitudes, it was found that the performance of EPS geofoam was not overly sensitive to permanent deformation, which was concentrated behind the top half of the abutment. By providing partial isolation, rather than accommodating thermal movements in their entirety, these results suggest that EPS geofoam can improve integral bridge performance even when subjected to large thermal movements.

本研究探讨了土工合成可压缩包体用于改善整体桥梁性能的程度。采用土工离心机模型，模拟了在有和没有1.2 m厚EPS土工泡沫包体的基础上，作用于9 m基台的热运动。在120年的热循环设计寿命中，可压缩包体显著降低了桥台背后产生的土压力，而不会发生明显的永久变形。这导致桥面轴力和峰值桥台弯矩分别仅达到未加土工泡沫时的三分之一和三分之二。当采用可压缩包裹体时，充填体沉降略有增加，但紧靠桥台后的峰值沉降保持在100 mm左右。通过极值位移幅值的应用，发现EPS土工泡沫塑料的性能对永久变形不太敏感，永久变形集中在桥台上半部分后。通过提供部分隔离，而不是完全容纳热运动，这些结果表明，即使在遭受大的热运动时，EPS土工泡沫也可以改善整体桥梁性能。

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引用次数: 0

Experimental study on reinforcement and remediation of nickel-contaminated sludge using grouting vacuum preloading combined with electroosmosis 注浆真空预压结合电渗透加固修复镍污染污泥的试验研究

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-12-01 Epub Date: 2025-07-13 DOI: 10.1016/j.geotexmem.2025.07.003

Peng Wang , Ming Li , Zhuoxuan Wu , Jun Wang , Guohui Yuan , Xianfeng Huang , Jianfeng Wu

Traditional vacuum preloading, electroosmotic techniques face challenges such as poor removal efficiency, reinforcement and high energy consumption when treating contaminated sludge with high water content. This study investigates the reinforcement and remediation of nickel (Ni)-contaminated sludge with high water content using an approach combining grouting, vacuum preloading, and electroosmosis (GVE). Through laboratory model tests, the effects of grouting agents, vacuum preloading, and voltage loading modes on Ni removal efficiency, soil reinforcement, and energy consumption were evaluated. The results demonstrate that the grouting of sodium alginate can chelate Ni²⁺ in the soil, facilitating the removal of heavy metal ions during the electroosmosis process. The GVE combined with vacuum preloading significantly enhances Ni removal rates, achieving up to 94.52 % compared to 65.11 % with electroosmosis alone. Additionally, GVE reduced soil water content to 30.34 % and increased shear strength to 98 kPa, indicating improved soil reinforcement. The step loading further reduced energy consumption by over 35 % compared to constant voltage loading while enhancing both soil remediation and reinforcement. This study concludes that GVE, particularly with step loading and intermittent loading, is an effective and energy-efficient method for remediating and reinforcing heavy metal contaminated sludge.

传统的真空预压、电渗透技术在处理高含水率的污染污泥时，面临去除率差、补强、能耗高等挑战。本研究采用灌浆、真空预压和电渗（GVE）相结合的方法对高含水率镍污染污泥进行加固和修复。通过室内模型试验，评价了注浆剂、真空预压和电压加载方式对Ni去除效率、土体加固和能耗的影响。结果表明，海藻酸钠灌浆能螯合土壤中的Ni2+，有利于电渗过程中重金属离子的去除。GVE联合真空预压显著提高了Ni的去除率，达到94.52%，而单独电渗透的去除率为65.11%。此外，GVE使土壤含水量降低到30.34%，抗剪强度提高到98 kPa，表明土壤加固效果有所改善。与恒压加载相比，阶梯加载进一步降低了35%以上的能耗，同时加强了土壤的修复和加固。本研究认为，GVE特别是分级加载和间歇加载是一种有效且节能的重金属污染污泥修复和加固方法。

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引用次数: 0

Consolidation analysis of staged-filled soil slurry with combined grid-horizontal and vertical drains system under vacuum preloading 真空预压下格栅-水平-垂直复合排水系统阶段填土浆体固结分析

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-12-01 Epub Date: 2025-06-19 DOI: 10.1016/j.geotexmem.2025.06.003

Ding-Bao Song , Yu Pan , Jian-Hua Yin , Zhen-Yu Yin , He-Fu Pu

This study presents a combined method utilizing grid-horizontal drains assisted by vacuum preloading for initial treatment, and vertical drains with vacuum preloading for further enhancement, aimed at the beneficial reuse of dredged marine sediments as fill material. A novel method for analyzing the consolidation of staged-filled soft soils with grid-horizontal and vertical drains under vacuum preloading is established, and a numerical model, called Combined-drains Consolidation Settlement (CCS), is developed. CCS accounts for staged filling, drain combinations, creep strains, hydraulic conductivity anisotropy, vertical and radial flows, smear effects, time-dependent surcharge and/or vacuum loading, and variable compressibility and hydraulic conductivity throughout the consolidation process. A large-scale laboratory consolidation test is presented, focusing on staged-filled marine sediments treated by the combined system, demonstrating beneficial reuse potential of high-water-content dredged sediments. Settlement and water content predictions using CCS agree well with experimental results. The effects of paving rate (lateral spacing) and the number of grid-horizontal drain layers (vertical spacing) are evaluated using the CCS model. Based on these results, cost-effective design recommendations are proposed. Comparison of treatment efficiency shows the combined method significantly enhances improvement by enabling earlier application of vacuum consolidation than the PVD-only method.

本研究提出了一种组合方法，利用真空预压辅助的网格水平排水沟进行初始处理，并进一步加强真空预压的垂直排水沟，旨在将疏浚的海洋沉积物作为填充物有益地再利用。建立了一种分析真空预压条件下具有水平和垂直排水沟的阶段填筑软土固结的新方法，并建立了排水沟固结沉降（CCS）数值模型。CCS考虑了阶段充填、排水组合、蠕变应变、水力导电性各向异性、垂直和径向流动、抹片效应、随时间变化的附加物和/或真空载荷，以及整个固结过程中的可变压缩性和水力导电性。本文提出了一项大型实验室固结试验，重点研究了联合系统处理的分级填充海洋沉积物，证明了高含水量疏浚沉积物的有益再利用潜力。利用CCS预测沉降和含水量与实验结果吻合较好。利用CCS模型对铺装率（横向间距）和栅格-水平排水层数（垂直间距）的影响进行了评价。基于这些结果，提出了具有成本效益的设计建议。通过对处理效率的比较表明，与单独的pvd方法相比，组合方法可以更早地应用真空固结，从而显著提高了处理效率。

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引用次数: 0

Centrifuge modeling on the geosynthetic-reinforced soil (GRS) abutments with different combinations of reinforcement spacing and tensile stiffness 土工合成加筋土（GRS）桥台不同配筋间距和抗拉刚度组合的离心模拟

IF 6.2 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-12-01 Epub Date: 2025-07-29 DOI: 10.1016/j.geotexmem.2025.07.009

Qingming Wang , Chao Xu , Geye Li , Panpan Shen , Chongxi Zhao

Three centrifuge model tests were conducted to investigate the performance of geosynthetic reinforced soil (GRS) abutments with modular block facing under localized vertical loads. This study examined the effects of different combinations of reinforcement spacing S_v and tensile stiffness J on the behavior of GRS abutments. In this study, river sand and woven geotextiles were used as the backfill soil and reinforcement material, respectively. Test results show that under the same ratio of J/S_v = 3.7, using the combination of smaller S_v and lower J was more effective in minimizing the beam seat settlements and the lateral facing displacements induced by localized vertical loads than the combination of larger S_v and higher J. Meanwhile, smaller additional vertical stresses transferred from the applied loads within the GRS abutment and smaller reinforcement tensile forces were also observed for the combination of smaller S_v and lower J. Furthermore, the maximum tensile forces in each layer occurred under the beam seat for the upper reinforcement layers and near the facing for the lower layers for all three tests. A more uniform distribution of the reinforcement tensile force was found for the combination of smaller S_v and lower J.

采用离心模型试验方法，研究了组合式砌块土工合成加筋土桥台在局部竖向荷载作用下的性能。研究了不同配筋间距Sv和抗拉刚度J组合对GRS基台性能的影响。本研究采用河砂作为回填土，采用编织土工布作为加固材料。试验结果表明，在相同J/Sv = 3.7的情况下，较小Sv和较低J的组合比较大Sv和较高J的组合更能有效地减小梁座沉降和局部竖向荷载引起的侧向位移。在较小的Sv和较低的j值组合下，GRS桥台内附加荷载传递的附加垂直应力较小，钢筋拉力较小。此外，在所有三种试验中，每一层的最大拉力都出现在上层钢筋层的梁座下方，下层钢筋层的面板附近。较小的Sv和较低的J组合使钢筋受拉力分布更为均匀。

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引用次数: 0

Case study: Design optimization and field tests of a large geotextile mat cofferdam combined with steel sheet piles 案例研究：大型钢板桩结合土工布围堰的设计优化与现场试验

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-12-01 Epub Date: 2025-06-11 DOI: 10.1016/j.geotexmem.2025.05.004

Yupeng Ren , Shuaidong Yang , Mi Zhou , Xihong Zhang , Jinhui Li , Yinghui Tian

A case study on a large geotextile mat cofferdam combined with steel sheet piles was conducted using field testing and numerical simulation to optimize the design and assess its performance. The failure mechanism and overall stability were investigated by numerical simulation, considering potential influence factors, including pile length, width ratio (

W_{2} / W_{1}

), water level, and excavation depth. The width ratio was identified as a critical influencing factor. Specifically, an optimized ratio of

W_{2} / W_{1} = 0.6

demonstrated the best overall performance. When the steel sheet pile intersects the potential failure surface, the stability improvement is most significant, particularly with a length of 15

m

in the current case. Field tests were employed to examine the performance of the optimized cofferdam design. Water level fluctuations, surface displacements, and both horizontal and vertical displacements at various depths were monitored to assess the cofferdam’s behavior. Results from both numerical simulations and field monitoring conclusively affirm the cofferdam’s capability to meet stringent safety criterion during the construction and operational phases. This work fills gaps in standardization of large geotextile mat cofferdam design by providing guidance on geometric configuration, reinforcement integration, and soft soil risk management, thereby advancing engineering practices for similar projects.

采用现场试验和数值模拟相结合的方法，对某大型钢板桩围堰进行了优化设计和性能评价。考虑桩长、桩宽比（W2/W1）、水位、开挖深度等潜在影响因素，采用数值模拟方法对破坏机理和整体稳定性进行了研究。确定了宽度比是一个关键的影响因素。具体而言，优化后的W2/W1=0.6时，整体性能最佳。当钢板桩与潜在破坏面相交时，其稳定性改善最为显著，特别是当前情况下长度为15 m的钢板桩。通过现场试验，验证了优化围堰设计的性能。监测水位波动、地表位移以及不同深度的水平和垂直位移，以评估围堰的行为。数值模拟和现场监测的结果最终证实了围堰在施工和运行阶段满足严格的安全标准的能力。通过对大型土工布围堰几何形态、加固整合、软土风险管理等方面的指导，填补了大型土工布围堰设计标准化的空白，促进了类似工程的工程实践。

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引用次数: 0

The role of boundary normal stiffness in the micromechanical behavior of geomembrane-sand interface: A numerical study 边界法向刚度在土工膜-砂界面细观力学行为中的作用：数值研究

IF 6.2 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-12-01 Epub Date: 2025-07-31 DOI: 10.1016/j.geotexmem.2025.07.011

Haibo Wang , Ge Gao , Mohamed A. Meguid , Nasser Khalili , Lulu Zhang

Three-dimensional discrete element method (DEM) is employed to investigate how boundary normal stiffness influences the shearing behavior at the soil-geomembrane interface. A robust and efficient algorithm was developed and implemented into direct shear numerical models, effectively capturing the key aspects of the sand-geomembrane interface behavior across a wide range of boundary normal stiffness values. The numerical model was validated by comparing the bulk responses of interface shear stress and volume change versus shear displacement with experimental data. At the microscale, particle displacements, rotations, contact network evolution, coordination number, redundancy factor and elastic stiffness tensor were investigated to shed light on the impact of normal stiffness on the interface response. The micromechanical insights, such as the development of higher level of geometrical and mechanical anisotropy, stronger interface interlocking to resist sliding and rolling of sand particles, and increased local density and bulk stiffness, are connected to the macroscopic response, explaining how higher boundary normal stiffness enhances interface shear strength and normal stress during shearing.

采用三维离散元法研究了边界法向刚度对土工膜界面剪切性能的影响。开发了一种鲁棒且高效的算法，并将其应用于直接剪切数值模型中，有效地捕获了在大范围的边界法向刚度值范围内砂-土工膜界面行为的关键方面。将界面剪应力和体积变化随剪切位移的体响应与实验数据进行对比，验证了数值模型的正确性。在微观尺度上，研究了颗粒位移、旋转、接触网络演化、配位数、冗余因子和弹性刚度张量，揭示了法向刚度对界面响应的影响。微观力学的见解，如更高水平的几何和力学各向异性的发展，更强的界面联锁以抵抗砂粒的滑动和滚动，以及增加的局部密度和体刚度，与宏观响应有关，解释了更高的边界法向刚度如何提高界面抗剪强度和剪切过程中的法向应力。

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引用次数: 0