考虑剪应力作用的挡土墙主动土压力计算  

A method for calculating active earth pressure considering shear stress

作　　者：陈林[1] 张永兴[1] 冉可新[2] 

机构地区：[1]重庆大学土木工程学院,重庆400045 [2]澳大利亚阿德莱德大学土木工程学院

出　　处：《岩土力学》2009年第S2期219-223,共5页Rock and Soil Mechanics

基　　金：国家自然科学基金(No.50878218);国家杰出青年科学基金(No.50625824);"十一五"国家科技支撑计划课题子题(No.2008BAJ06B04)

摘　　要：将墙后土体主应力偏转考虑为土体的土拱效应,根据土拱形状计算平均竖直应力,由此得到了对应不同内摩擦角和墙土摩擦角的侧土压力系数。将其用于水平微分单元法,并满足力和力矩平衡条件求解挡土墙主动土压力,得到了挡土墙主动土压力强度、土压力合力和合力作用点的理论公式,并与库仑土压力理论和模型试验数据进行了比较分析。结果表明,挡土墙主动土压力强度为非线性分布,与模型试验结果基本吻合。In order to eliminate the calculation inaccuracy,considering the effect of the angle of internal friction on the inclination of the sliding plane of soils behind retaining wall,considering the deflected principal stress as soil arching effect,the horizontally earth pressure factor is calculated for different friction angles of soil and friction angle between wall-surface and soil based on the analysis about minor principal stress of soil arching elements to study the vertical stress.The theoretical formulae of the active earth pressures,the resultant earth pressures and the points of application of resultant earth pressures were obtained based on the method which satisfies the equilibrium condition.The formula presented is compared with some experimental observations.The results agree well with those of the experimental observations.

关 键 词：土拱 土压力 剪应力 静力平衡 

分 类 号：TU432[建筑科学—岩土工程]