编织土工织物与沙界面的剪切行为和相互作用机制的三维 DEM 研究

IF 4.7 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL Geotextiles and Geomembranes Pub Date : 2024-06-24 DOI:10.1016/j.geotexmem.2024.06.004
Yafei Jia , Jun Zhang , Yewei Zheng
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引用次数: 0

摘要

本文采用三维离散元法(DEM)对土工织物与角砂相互作用的微观机理进行了数值研究。土工织物的表面纹理和拉伸特性采用重叠球形颗粒模拟,角砂采用刚性块模拟。DEM 模型根据先前的实验数据进行了全面校准。根据颗粒位移梯度,定量确定了界面附近砂的剪切区和扩张区。对接触力进行了分析,以解释宏观强度演变背后的微观机制。此外,还讨论了土工织物表面粗糙度对土工织物-砂界面剪切强度的影响。结果表明,编织土工织物-砂界面的破坏模式是沿土工织物表面的颗粒滑动破坏和界面上方剪切区内砂的剪切破坏的组合。在达到剪切阻力峰值之前,接触力会迅速重新分布,而在达到剪切应力峰值之后,剪切区内的平均法向接触力会保持相对稳定。完全发育的剪切带通常会在达到峰值抗剪应力后稳定土壤变形。
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3D DEM investigation of shear behavior and interaction mechanism of woven geotextile-sand interfaces

This paper presents a numerical study on the investigation of microscopic mechanism governing the interaction of woven geotextile and angular sand employing the 3D discrete element method (DEM). The surface texture and tensile properties of the geotextile were simulated using overlapping spherical particles, and the angular sand was simulated using rigid blocks. The DEM models were fully calibrated based on previous experimental data. The shear and dilation zones of sand near the interface were quantitatively determined based on particle displacement gradients. Analysis of contact forces was conducted to explain the microscopic mechanism behind the macroscopic strength evolution. The influence of geotextile surface roughness on the shear strength of the geotextile-sand interface is also discussed. The results show that the failure mode of the woven geotextile-sand interface is a combination of particle sliding failure along the geotextile surface and shear failure of the sand within the shear zone above the interface. There is a rapid redistribution of contact forces prior to reaching peak shear resistance, and the average normal contact force within the shear zone remains relatively constant after the peak shear stress is achieved. A completely developed shear zone stabilizes soil deformation, typically after achieving the peak shear resistance.

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来源期刊
Geotextiles and Geomembranes
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.
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