挡墙后粘性土被动土压力的薄层微元法  

Thin-layer Micro-element Method for Computing Passive Earth Pressure of Backfilled Cohesive Soil on Retaining Wall

作　　者：林宇亮[1] 杨果林[1] 黄向京[1] 

机构地区：[1]中南大学土木建筑学院,湖南长沙410075

出　　处：《公路交通科技》2011年第3期12-19,41,共9页Journal of Highway and Transportation Research and Development

基　　金：铁道部科技研究开发计划项目(2008G010-A);湖南省研究生科研创新项目(CX2010B049);中南大学优秀博士学位论文扶植基金资助项目(2010ybfz049)

摘　　要：基于水平层分析法的思想,采用薄层微元法,推导了考虑挡墙墙高、墙背倾角、填料面仰角、均布超载、填料重度、填料摩擦角、填料与墙背粘结力和摩擦角(外摩擦角)等条件下的粘性土被动土压力公式的解析解,采用图解法给出了临界破裂角的显式解答。并分析了这些因素对被动土压力临界破裂角、被动土压力强度分布、土压力合力大小和作用点位置的影响。结果表明,被动土压力强度沿墙高呈非线性分布;现行库伦和朗肯理论下的被动土压力公式均为被动土压力公式在相应简化假设条件下的一种特例。墙背倾角、填料面仰角、均布超载、填料粘聚力、内摩擦角、外摩擦角等对被动土压力大小和分布情况影响显著,填料重度对土压力合力作用点影响不大。Based on the thought of horizontal layer analysis,thin-layer micro-element method was suggested to deduce the passive earth pressure formula of cohesive soil considering the height of retaining wall,batter angle of wall back,elevation angle of filler,equispaced overloading,gravity and internal friction angle of filler,cohesion and external friction angle between filler and wall back.Explicit solution of critical rupture angle was obtained by graphic method.The effects of these parameters on critical rupture angle,distribution,resultant force and application position of passive earth pressure were analyzed.The results show that（1） the distribution of passive earth pressure along the height of retaining wall is non-linear;（2） Coulomb and Rankine passive earth pressure formulas are special cases of passive earth pressure formula under corresponding simplified assumptions;（3） the passive earth pressure and its distribution are greatly affected by the factors such as batter angle of wall back,elevation angle of filler,equispaced overloading,cohesion of filler,internal friction angle and external friction angle of filler,while gravity makes little effect on application position of resultant force of passive earth pressure.

关 键 词：道路工程 被动土压力 薄层微元法 粘性土 

分 类 号：U411[交通运输工程—道路与铁道工程]