挡土墙后黏性土的地震主动土压力分析  

ANALYSIS OF SEISMIC ACTIVE EARTH PRESSURE OF COHESIVE SOIL BEHIND RETAINING WALL

作　　者：夏唐代[1,2] 孔祥冰[1,2] 王志凯[1,2] 陈炜昀[1,2] 

机构地区：[1]浙江大学软弱土与环境土工教育部重点实验室,浙江杭州310058 [2]浙江大学岩土工程研究所,浙江杭州310058

出　　处：《岩石力学与工程学报》2012年第A01期3188-3195,共8页Chinese Journal of Rock Mechanics and Engineering

基　　金：浙江省重点科技创新团队支持计划资助(2009R50050)

摘　　要：在Mononobe-Okabe平面滑裂面假设的基础上,考虑地震加速度的放大效应,运用拟动力学的分析方法,得到考虑时间和相位变化的刚性挡土墙后黏性土地震主动土压力系数、地震主动土压力合力和主动土压力分布强度的理论公式。在此基础上,利用优化算法得到地震卓越周期中的最不利工况,分析水平和竖向地震加速度系数、内摩擦角、墙面摩擦角、挡土墙倾角和地震放大系数对最不利工况下滑动面倾角、主动土压力系数、临界深度、合力作用点和土压力分布的影响。研究表明:地震主动土压力分布为非线性;地震加速度的存在大大增加黏性土的主动土压力;挡土墙倾角和地震放大效应对临界深度、合力作用点和土压力分布都有着明显影响。Based on the planar rupture surfaces hypothesis of Mononobe-Okabe theory, considering the effect of amplification of seismic accelerations and using the pseudo-dynamics method, the seismic active earth pressure coefficient, the resultant force of seismic active earth pressure and the distribution of active earth pressure on a rigid retaining wall supporting cohesive backfill are obtained respectively. Time and phase changes within the backfill are also considered. On this basis, the most unfavorable conditions are investigated by an optimization algorithm. Then the effects of horizontal and vertical seismic accelerations, internal fiction angle, wall friction angle, retaining wall angle and amplification on the inclination of the slip surface on active earth pressure coefficient, critical depth, the location of resultant force and the distribution of active earth pressure are discussed. The results show that the distribution of seismic active earth pressure is nonlinear. The existence of seismic acceleration induces a considerable increase in the active earth pressure of cohesive soil. The retaining wall angle and amplification effect of seismic accelerations have obvious influences on the critical depth, location of resultant force and distribution of passive earth pressure.

关 键 词：土力学 刚性挡土墙 地震主动土压力 黏性土 拟动力学方法 放大效应 

分 类 号：TU43[建筑科学—岩土工程]