有限宽度砂土刚性挡墙被动土压力的离散元模拟及简化计算方法  

Discrete Element Simulation and Simplified Calculation Method for Passive Earth Pressure of Rigid Retaining Wall with Finite Width Sandy Soil

作　　者：刘海鸿 戴卓吕 曾亚林 刘文劼 LIU Haihong;DAI Zhuolyu;ZENG Yalin;LIU Wenjie(Zhongrong Planning and Design Co.,Ltd.,Changsha,Hunan 410219,China;CCCC Central-South Engineering Co.,Ltd.,Changsha,Hunan 410029,China;Hunan Communications Research Institute Co.,Ltd.,Changsha,Hunan 410015,China)

机构地区：[1]中榕规划设计有限公司,湖南长沙410219 [2]中交中南工程局有限公司,湖南长沙410029 [3]湖南省交通科学研究院有限公司,湖南长沙410015

出　　处：《公路工程》2023年第3期173-180,共8页Highway Engineering

基　　金：湖南省交通科技项目(202214)。

摘　　要：为考虑砂土的应变软化效应及其有限宽度情况下墙后被动土压力计算,首先提出一种实用的砂土应变软化模型;在此基础上,采用极限平衡法简化求解了墙后有限填土被动土压力,并与离散元法(DEM)数值结果对比验证了该方法的有效性,还探讨了填土宽度和墙体位移对墙后有限填土被动土压力的影响。分析结果表明,有限砂土被动土压力计算中应考虑应变软化效应,尤其对于密实砂土;随着墙体位移和墙后填土宽度增加,被动土压力会减少。In order to consider the strain softening effect of sandy soil and its passive earth pressure calculation behind the wall in the case of limited width,a practical strain softening model of sandy soil is firstly proposed;on this basis,the limit equilibrium method is used to simplify the solution of the passive earth pressure behind the wall with narrow backfill widths,and the numerical results are compared with the discrete element method(DEM)to verify the validity of the method,as well as to explore the effects of backfill width and wall displacement on the passive earth pressure behind the wall with finite fill.The effects of the backfill width and wall displacement on the passive earth pressure of the limited backfill behind the wall were investigated.The analysis results show that the strain softening effect should be considered in the calculation of the passive earth pressure of limited sandy soil,especially for dense sandy soil;the passive earth pressure decreases as the wall displacement and the width of the backfill behind the wall increase.

关 键 词：被动土压力 有限填土 离散元法 应变软化 极限平衡法 

分 类 号：TU[建筑科学]