考虑土拱效应的非垂直刚性挡墙主动土压力

Active Earth Pressure for Non-vertical Rigid Retaining Wall Considering Soil Arching Effect

为研究非垂直刚性挡墙的主动土压力计算方法,根据土拱效应原理、微分水平层法以及水平向静力平衡条件,得到了平移模式下非垂直刚性挡土墙墙后填土破裂角的计算式,并进一步根据力与力矩平衡条件获得了平移模式下非垂直刚性挡土墙墙后主动土压力、合力及其作用点等的计算式。通过计算对各种特殊情况下的破裂角和主动土压力进行分析,讨论了墙背倾角、墙土摩擦角等对破裂角、法向主动土压力系数、法向主动土压力和主动土压力合力作用点高度等的影响。该研究可为非垂直墙背的支挡结构设计中的主动土压力计算提供更为合理的理论支持。

Active earth pressure for non-vertical rigid retaining wall is studied. Considering soil arching effect,according to differential level layer method and horizontal static equilibrium,a new formula of the inclinations of sliding surface behind the inclined rigid retaining wall is obtained under translation mode. Then according to static and moment equilibrium,a new expression of the active earth pressure were derived,and those of the active earth force and the height of application of its is also putted forward. The special solutions of the failure angle and the active normal earth pressure are discussed under various boundary conditions. In addition,the effects of the inclination of wall-back surface,the internal friction angle of backfill and the wall-soil friction angle on the failure angle,the active normal earth pressure and its coefficient,and application height the active earth force is investigated. This study can provide a more reasonable theoretical support for the design calculation of the active earth pressure against the non-vertical rigid retaining structures.