既有折线滑裂面下挡土墙主动土压力研究

Active Earth Pressures on a Retaining Wall with Preexisted Segmental Linear Slip Surfaces

基于库伦土压力理论,采用平行滑裂面的微分单元法,推导出以陡峻的折线型稳定岩石坡面为滑裂面下的挡土墙主动土压力合力大小、土压力分布、合力作用点位置计算式,对规范采用的以稳定岩石坡面为单一直线滑裂面下的挡土墙主动土压力计算式进行改进,算例分析表明:在折线滑裂面下,滑裂面的转折点高度与转角大小变化将使得土压力的计算结果增大;当折线滑裂面退变为直线滑裂面时,既有折线滑裂面下挡土墙主动土压力计算式可以简化为规范公式。

Based on the Coulomb＇s Earth Pressure theory, the total forces, stress distribution, and the location of the concentrated force acting on a retaining wall with preexisted segmental linear slip surfaces are estimated by using differential element method on the parallel slip surface. This approach also improves the active earth pressure estimation method of single linear slip surface that defined in the current code. The results indicate that, under segmental linear slip cracks, change of the location of the corner of slip lines and the angle between lines will result in an increase of the active pressures. When the segmental linear slip surface becomes a single slip line, the earth pressure is the same as the value defined in the current design code.