|Table of Contents|

Discrete element analysis of soil arching effect under cyclic loading(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2023年03期
Page:
152-160
Research Field:
岩土工程
Publishing date:

Info

Title:
Discrete element analysis of soil arching effect under cyclic loading
Author(s):
CAO Jun1;  WANG Kangyu1;  LUO Dajiang2
(1. College of Civil Engineering, Zhejiang University of Technology, Hangzhou 310014, Zhejiang, China; 2. Hangzhou Zhongbang Foundation Engineering Co., Ltd, Hangzhou 310000, Zhejiang, China)
Keywords:
soil arching effect;  discrete element;  cyclic loading;  Trapdoor test;  force chain
PACS:
TU411
DOI:
10.19815/j.jace.2021.11032
Abstract:
Based on indoor Trapdoor model test, PFC2D was used to study the soil arching effect of different embankment heights under cyclic loading. The changes in soil arch structure and filler movement inside the embankment were analyzed from the perspectives of force chain and displacement, and macro and micro analyses were conducted. The results show that the anti torsion model can effectively simulate the Trapdoor test using aluminum rod like soil as filler. Under cyclic loading, the soil arch structure formed within the embankment is damaged, and the soil arching effect is weakened. The failure of the soil arch structure mainly occurs during the initial loading stage, and at this stage, the bottom soil arch structure of the high embankment is less affected by external loads than that of the low embankment. As the loading progresses, a new stable stress structure is formed inside the embankment and remains basically unchanged. During the cyclic loading process, the force chain structure on both sides of the low embankment loading plate is more affected and disturbed than that of the high embankment. Under cyclic loading, the surface of the embankment undergoes settlement, with plastic displacement mainly occurring during the initial loading stage and almost elastic displacement occurring thereafter. Compared to low embankments, the soil on both sides of the loading plate on high embankments is less prone to lateral displacement and being squeezed towards both ends during the first loading. The vertical displacement of the loading plate is reduced, thereby reducing the impact of the loading plate on the bottom soil and making the soil arch structure at the bottom of the embankment less susceptible to be impacted.

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Last Update: 2023-05-20