考虑土拱效应刚性挡墙土压力研究_彭述权.pdfVIP

第29 卷第10 期 岩 土 力 学 Vol.29 No.10 2008 年10 月 Rock and Soil Mechanics Oct. 2008 文章编号：1000－7598 －(2008) 10 －2701 －07 考虑土拱效应刚性挡墙土压力研究 1, 2 2 1, 2 1 彭述权 ，周 健 ，樊 玲 ，刘爱华 （1.中南大学 资源与安全工程学院，长沙 410083 ；2. 同济大学 地下建筑工程系，上海 200092 ） 摘 要：基于库仑土压力理论，假定刚性挡墙后主应力拱迹线为抛物线，推导了主、被侧土压力系数和水平微分单元间摩擦 系数的理论公式，得到改进的主、被动土压力计算公式。研究表明：考虑土拱效应计算结果与模型试验结果吻合比较好。主 动极限状态下，土体内摩擦角越小，墙土接触面上外摩擦角越大，土拱效应越明显，主动土压力合力作用点越上移；被动极 限状态下，土体内摩擦角和墙土接触面上外摩擦角越大，土拱效应越明显，被动土压力合力点越往下移。 关 键 词：土拱效应；刚性挡墙；土压力；主应力拱 中图分类号：TU 432 文献标识码：A Research on earth pressure of rigid retaining wall considering soil arching PENG Shu-quan1, 2 2 1, 2 1 , ZHOU Jian , FAN Ling , LIU Ai-hua (1. School of Resources and Safety Engineering, Central South University, Changsha 410083, China; 2. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China) Abstract: Based on Coulomb’s earth pressure theory, assuming the trace of the principal stress arching in the back of rigid retaining wall as parabola, the theory formulae are obtained including the lateral coefficients of active and passive earth pressures and the friction coefficients of horizontal differential elements; then improved formulae of active and passive earth pressures are presented. The results show that the calculation results considering soil arching are consistent with the ones of model tests. Being in active limit state, the inner friction angles become smaller, the outer friction angles on the soil-wall interface become larger; the effect of soil arching becomes more distinct; as a result, the applicatio