层状填土主动土压力计算方法的改进

Improvement of Active Earth Pressure on Retaining Walls with Layered Backfills

针对现有层状填土主动土压力计算方法中存在的局限性和不合理性,对原有计算方法进行了拓展和改进.在平面滑裂面假设下,充分考虑墙后分层填土的滑动变形协调条件以及墙背倾斜、填土表面有附加荷载、填土黏聚力、填土与挡土墙墙背接触面上的黏着力等一般情况,建立分层填土的主动土压力关于滑裂面倾角的计算表达式,有效地改进了分层法,增加了实用性,为工程中挡土墙土压力设计提供了更为合理、有效的方法.

Due to the limitation and illogicality identified in the current algorithms for active earth pressure of two-layered backfills, the original calculating methods have been modified in this research. Based on sliding plane hypothesis and deformation compatibility condition, a formula is derived for the calculation of active earth pressure of layered backfills with the consideration of some issues, such as the inclined back face, additional load, cohesion force on sliding plane and the adhesive force, on the interface between soil and retaining wall. The proposed multi-layer method is proved to be more technically reasonable and effective for retaining wall design.