DEM analysis of load transfer in double-layer geosynthetic-reinforced pile-supported embankments

IF 2.8 3区工程技术 Q1 MATHEMATICS, INTERDISCIPLINARY APPLICATIONS Computational Particle Mechanics Pub Date : 2024-09-25 DOI:10.1007/s40571-024-00834-8

Rong Sun, Xin Jiang, Lei Zhang, Canyang Cui, Mian Zhang, Zhengxian Li, Yanjun Qiu

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Abstract

In recent years, geosynthetic-reinforced pile-supported (GRPS) embankments have gathered increasing attention in the scientific community for their effectiveness in improving soft ground. This study aims to investigate the load transfer of double-layer GRPS embankments using the discrete element method (DEM), with a focus on soil arching effects and membrane effects. A coefficient, denoted as η and defined as h/H, was introduced to study the influence of the distance between two geosynthetics on load transfer. The results indicated: (1) Double-layer GRPS embankments demonstrated uniform load transmission downwards, thereby reducing the large deformation zone within the embankment fill. (2) Maximum tension in geosynthetics occurred at the edges of pile caps in both single-layer and double-layer GRPS embankments. However, double-layer GRPS embankments effectively mitigated the maximum tension in geosynthetics. (3) Double-layer GRPS embankments minimized soil arching formation within the embankment while enhancing membrane effects. (4) With increasing η, soil arching gradually formed between the two layers of geosynthetics. (5) Above a η threshold of 0.1, the maximum tension in the lower layer of geosynthetics significantly exceeded that in the upper layer.

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双层土工合成筋桩支撑路堤荷载传递的DEM分析

近年来，土工合成增强桩支撑（GRPS）路堤因其改善软土地基的有效性而受到科学界的越来越多的关注。采用离散元法（DEM）研究了双层GRPS路堤的荷载传递，重点研究了土拱效应和膜效应。引入系数η，定义为h/ h，研究两种土工合成材料之间的距离对荷载传递的影响。结果表明：(1)双层GRPS路堤荷载向下均匀传递，减少了路堤填方内部的大变形区；(2)在单层和双层GRPS路堤中，土工合成材料的最大张力都出现在承台边缘。然而，双层GRPS路堤有效地减轻了土工合成材料的最大张力。(3)双层GRPS路堤减少了路堤内土拱的形成，同时增强了膜效应。(4)随着η的增大，两层土工合成材料之间逐渐形成土拱。(5)当η阈值为0.1时，土工合成材料下层的最大张力显著大于上层。

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来源期刊

Computational Particle Mechanics Mathematics-Computational Mathematics

CiteScore

5.70

自引率

9.10%

发文量

期刊介绍： GENERAL OBJECTIVES: Computational Particle Mechanics (CPM) is a quarterly journal with the goal of publishing full-length original articles addressing the modeling and simulation of systems involving particles and particle methods. The goal is to enhance communication among researchers in the applied sciences who use "particles'''' in one form or another in their research. SPECIFIC OBJECTIVES: Particle-based materials and numerical methods have become wide-spread in the natural and applied sciences, engineering, biology. The term "particle methods/mechanics'''' has now come to imply several different things to researchers in the 21st century, including: (a) Particles as a physical unit in granular media, particulate ﬂows, plasmas, swarms, etc., (b) Particles representing material phases in continua at the meso-, micro-and nano-scale and (c) Particles as a discretization unit in continua and discontinua in numerical methods such as Discrete Element Methods (DEM), Particle Finite Element Methods (PFEM), Molecular Dynamics (MD), and Smoothed Particle Hydrodynamics (SPH), to name a few.