基于离散元方法的不同挡墙变位模式下有限土体主动土压力研究  

Study of active earth pressure of finite soils under different retaining wall movement modes based on discrete element method

作　　者：张恒志 徐长节[1,2,3] 何寨兵 黄展军 何小辉 ZHANG Heng-zhi;XU Chang-jie;HE Zhai-bing;HUANG Zhan-jun;HE Xiao-hui(Research Center of Coastal and Urban Geotechnical Engineering,Zhejiang University,Hangzhou,Zhejiang 310058,China;Center for Balance Architecture,Zhejiang University,Hangzhou,Zhejiang 310028,China;National Experimental Teaching Demonstration Center of Civil Engineering,East China Jiaotong University,Nanchang,Jiangxi 330013,China;Huzhou-Hangzhou Railway Co.,Ltd.,Hangzhou,Zhejiang 311100,China;Nanchang Rail Transit Group Co.,Ltd.,Nanchang,Jiangxi 330013,China)

机构地区：[1]浙江大学滨海和城市岩土工程研究中心,浙江杭州310058 [2]浙江大学平衡建筑研究中心,浙江杭州310028 [3]华东交通大学土木工程国家实验教学示范中心,江西南昌330013 [4]湖杭铁路有限公司,浙江杭州311100 [5]南昌轨道交通集团有限公司,江西南昌330013

出　　处：《岩土力学》2022年第1期257-267,共11页Rock and Soil Mechanics

基　　金：国家自然科学基金(No.51878276);国家杰出青年科学基金(No.51725802);浙江省自然科学基金委员会-华东院联合基金(No.LHZ19E080001);江西省自然科学基金重点项目(No.20192ACB20001)。

摘　　要：为研究挡墙变位模式以及墙后填土宽度对无黏性有限土体主动土压力的影响,在不同墙后填土宽度条件下分别开展了挡墙平动(T)模式、绕墙底转动(RB)模式以及绕墙顶转动(RT)模式的离散元模拟。根据离散元模拟结果对主动土压力、墙后土体破坏模式以及应力状态进行了分析。研究结果表明:挡墙变位模式和墙后填土宽度的变化使得土体破坏模式和应力状态发生变化,引起主动土压力大小及分布的差异。T与RB模式滑动土楔中内摩擦角调动值会相对初始值增加,且T模式滑动土楔中会出现小主应力拱。RT模式较为特殊,在填土宽度较小时,其应力状态与T模式相似;在填土宽度较大时,滑动土楔上部会出现内摩擦角调动值相对初始值减小的区域,并出现大主应力拱。To study the influence of the movement mode of retaining wall and the width of fill on the active earth pressure of cohesionless finite soil,the discrete element simulation of translation(T)mode,rotating about the base(RB)mode and rotating about the top(RT)mode of retaining wall were carried out under different widths of fill.According to the discrete element simulation results,the active earth pressure,the failure mode of the soil behind the wall and the stress state were analyzed.The results indicate that the failure mode and stress state of soil are transferred by the change of retaining wall movement mode and the widths of fill,which lead to the variation of active earth pressure distribution.The values of mobilized internal friction angle in the sliding wedge of T and RB modes will increase relative to the initial value,and small principal stress arches will appear in the sliding soil wedges of T mode.The RT mode is more special,when the width of fill is small,the stress state is similar to the T mode;when the width of fill is large,in the upper part of the sliding wedge,there will be a region in which the internal friction angle is reduced relative to the initial value,and a large principal stress arch will appear.

关 键 词：离散元方法 主动土压力 无黏性土 有限土体 土拱效应 

分 类 号：TU432[建筑科学—岩土工程]