Microscale analysis of geomembrane–geotextile interface cyclic shear behavior using DEM

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes Pub Date : 2024-11-25 DOI:10.1016/j.geotexmem.2024.11.009

Jian Wu , Ya-Qiong Wang , Shi-Jin Feng

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引用次数: 0

Abstract

Given that the material-wearing process is the key factor influencing the dynamic shear strength at the interface between the geomembrane (GMB) and nonwoven geotextile (NWGT), this study investigates the cyclic shear behavior of the GMB–NWGT interface from a microscale perspective using the three-dimensional discrete element method (DEM). The textured GMB is simulated with breakable asperities and the thermally bonded NWGT is generated by spatially randomly distributed fibers which could be stretched and untangled. The established model is validated against the experimental data. The wearing process during cyclic loading is evaluated by quantifying the embedded depth of GMB asperities and fiber breakage within NWGT. The simulation results demonstrate that the maximum asperity embedment (inter-embedding effect), affected by the normal stress and displacement amplitude, induces the hook and loop interactions between asperities and fibers (inter-locking effect), accounting for the cyclic shear resistance at the interface. The inter-locking effect dominates the strain-hardening behavior of the GMB–NWGT interface when the percentage of inter-fiber bond breakage is less than 22% and the maximum asperity embedment ratio is lower than 60%; otherwise, the inter-embedding effect dominates the strain-softening behavior of the interface.

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利用 DEM 对土工膜-土工织物界面循环剪切行为进行微观分析

鉴于材料磨损过程是影响土工膜（GMB）和无纺土工布（NWGT）界面动态剪切强度的关键因素，本研究采用三维离散元素法（DEM）从微观角度研究了 GMB-NWGT 界面的循环剪切行为。模拟的纹理 GMB 具有可断裂的尖角，热粘合 NWGT 由空间随机分布的纤维生成，这些纤维可以拉伸和松开。所建立的模型与实验数据进行了验证。通过量化 GMB 突起的嵌入深度和 NWGT 内的纤维断裂情况，对循环加载期间的磨损过程进行了评估。模拟结果表明，受到法向应力和位移振幅的影响，最大渐开线嵌入深度（嵌入间效应）诱发了渐开线和纤维之间的钩环相互作用（锁定间效应），从而产生了界面上的循环剪切阻力。当纤维间结合断裂的百分比小于 22% 且最大非晶体嵌入比小于 60% 时，互锁效应将主导 GMB-NWGT 界面的应变硬化行为；反之，互嵌效应将主导界面的应变软化行为。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Geotextiles and Geomembranes 地学-地球科学综合

CiteScore

9.50

自引率

21.20%

发文量

111

审稿时长

59 days

期刊介绍： The range of products and their applications has expanded rapidly over the last decade with geotextiles and geomembranes being specified world wide. This rapid growth is paralleled by a virtual explosion of technology. Current reference books and even manufacturers' sponsored publications tend to date very quickly and the need for a vehicle to bring together and discuss the growing body of technology now available has become evident. Geotextiles and Geomembranes fills this need and provides a forum for the dissemination of information amongst research workers, designers, users and manufacturers. By providing a growing fund of information the journal increases general awareness, prompts further research and assists in the establishment of international codes and regulations.