层状填土的主动土压力计算

Active Earth Pressure Acting on Retaining Walls with Layered Backfills

假定滑裂面为通过墙踵的折线,将水平层分析法推广到填土分层的挡土墙的土压力计算中,合理地解释了墙背不光滑时主动土压力分布的非线性特点.在平移模式下,水平层分析方法可得到和库仑理论基本一致的主动土压力合力,但是得到的倾覆力矩大于按库仑理论得到的结果,而且合力作用点明显高于库仑理论的结果,这说明库伦理论高估了平移模式下挡土墙的抗倾覆稳定性.另外,理论分析表明墙后上软下硬的填土方案要优于上硬下软的填土方案.

The rupture line is assumed as a broken line through the heel, and the method of level-layer analysis is introduced to calculate the earth pressure acting on the retaining walls with layered backfills. The nonlinear distributions of active earth pressure on retaining walls with rough backs can be explained by using the method. The calculated results show that, for the movement mode of translation, the resultant forces calculated by using the method are approximately equal to those calculated by using Coulomb Theory, while the overturning moments of force and the heights of acting point of the resultant by using the former are higher, which means that the ability of the walls to resist overturning is overestimated by using Coulomb theory for the movement mode of tranlation. In addition, the analysis on the wall with two-layered backfills shows that the filling project with a soft upper-layer and a stiff lower-layer is better than that with a stiff upper-layer and a soft lower-layer.