地震荷载下重力式挡土墙的抗倾覆稳定性分析

Calculation method for stability against overturning of gravity retaining wall under seismic condition

基于平面滑裂面假设,采用水平层分析法推导了地震荷载作用下的主动土压力计算公式,并给出了地震土压力沿墙高的分布及土压力合力作用点的位置。在此基础上提出了重力式挡土墙的抗倾覆稳定性验算公式,为实际工程中挡土墙抗震设计提供了理论依据。稳定性分析结果表明,随着水平地震荷载的增大,抗倾覆稳定性显著降低。

Based on sliding plane hypothesis,an analytical expression for the seismic active earth pressure on the retaining wall is derived considering the effect of both horizontal and vertical seismic inertia force.The distribution of seismic active force and the application point of the resultant seismic earth pressure can be obtained by present analysis.This paper also provides an expression for the safety factor of retaining wall against overturning,which can be used in seismic design of gravity retaining wall.The stability analysis shows that the safety factor decreases significantly with the increase in horizontal seismic coefficient.