刚性挡墙后背多层土体被动土压力分析

Passive Earth Pressure Analysis of Multilayer Soils behind Rigid Retaining Wall

针对刚性挡土墙后存在3层土体的情况,考虑墙背倾斜、土体层面倾斜、土体表面作用局部条形荷载、地震力等因素,基于拟静力模式,运用FLAC3D模拟分析墙体平动模式下的被动土压力,确定土压力沿墙高分布,其合力值比经典理论的近似简化计算结果约高出20%,偏保守的传统方法仅可用于粗略估算。此外,讨论了土体顶面局部条形荷载、地震系数、土层倾角对被动土压力和土体滑裂面的影响特征,结果显示,水平地震系数和土层倾角影响显著。

In relation to the situation that there are three layers of soil behind the rigid retaining wall,considering the tilt of the back of the wall,the tilt of the soil layer,the local strip load on the soil surface,the seismic force and other factors,the passive earth pressure under the wall translational mode is analyzed by using FLAC3D simulation based on the quasi-static mode,and the distribution of the earth pressure along the wall height are determined.The resultant force value is about 20%higher than the approximate simplified calculation result of classical theory,therefore the conservative traditional method can only be used for rough estimation.In addition,the effects of local strip load and seismic coefficient on passive earth pressure and sliding surface of soil have been analyzed,and the results show that the horizontal seismic coefficient has significant effects.