有限土体主动土压力计算的土拱效应分析  

Calculation of active earth pressure for finite soils based on the soil arching theory

作　　者：杨明辉[1] 汪罗成[1] 赵明华[1] 

机构地区：[1]湖南大学土木工程学院,长沙410082

出　　处：《建筑结构》2013年第2期71-75,21,共6页Building Structure

基　　金：国家自然科学基金(51278184);教育部博士点基金(20070532008);湖南大学青年教师成长资助项目

摘　　要：基于墙后土体为半无限土体假定的经典土压力理论不适用于有限土体土压力计算。分析了墙后有限土体的破坏模式及位移特征,并考虑应力偏转现象分析了有限土体中的成拱效应。在此基础上,基于水平薄层法分析了有限土体主动土压力分布特征,给出了有限土体主动土压力强度的理论计算方法。该方法可较好地考虑有限土体宽度及土拱效应对土压力分布造成的影响。与试验实测数据对比表明,相比经典土压力理论,该方法的计算值更接近于实测值,可供相关设计计算参考。对影响有限土体土压力分布的主要参数进行了初步研究,如土体计算宽度、土体黏聚力及内摩擦角。结果表明:不同参数取值并未改变有限土压力沿深度的分布规律;同一深度处,土压力值随计算宽度与土体摩擦角的增大而增大,但随土体黏聚力的增加而减小。Based on the fact,the classical earth pressure theory that assumes the soil behind the wall being semi-infinite soil is not suitable for the pressure calculation of finite soil.Failure modes and displacement characteristics of finite soil behind the wall were analyzed,and its arching effect was also analyzed by considering stress deflection phenomenon.On this basis,active earth pressure distribution of finite soil and its theoretical calculation method were given based on horizontal thin layer method.The method can well consider the width of finite soil and influence of soil arching effect on earth pressure distribution.Comparing with the test measured data shows that calculation values obtained by the method are more close to the measured value than those obtained by classical earth pressure theory,which can be reference for the relevant design calculation.The main parameters which influence the earth pressure distribution of finite soil were studied preliminarily,such as soil calculation width,cohesion and internal friction angle of the soil.The results show that different values of the different parameters can not change the finite soil＇s pressure distribution along the depth,at the same depth,soil pressure values of the soil increase with the increase of the soil＇s calculation width and cohesion,and decrease with the increase of the soil＇s internal friction angle.

关 键 词：有限土体 主动土压力 土拱效应 模型试验 水平薄层法 

分 类 号：TU443.15[建筑科学—岩土工程]