降雨与地震共同作用下碎石土边坡的稳定性分析

Analysis on Gravel Slope Stability During Rainfall and Earthquake

为研究降雨与地震共同作用条件下碎石土边坡稳定性的影响机制,通过建立楼房山隧道罐子沟端滑坡防治工程数值计算模型,分别计算并分析了降雨单独作用、地震单独作用及降雨与地震共同作用条件下边坡应力场、位移场、塑性区及剪应变增量的变化规律,从而得出3种情况下边坡稳定性的破坏机理。研究结果表明,降雨与地震共同作用下碎石土边坡的稳定性比降雨单独作用或地震单独作用时的稳定性差,更容易发生滑坡、泥石流等地质灾害。

In order to research the affecting mechanism of gravel soil slope stability under the condition of rainfall alone, earthquake alone, both rainfall and earthquake, this paper established the three- dimensional numerical model of Loufangshan gravel landslide, and analyzed the change rule of the stress field, displacement field, plasticity zone and shear strain increment of slope under the condition of both rainfall and earthquake. The research result shows that the stability of gravel soil slope is decreased greatly under the condition of both rainfall and earthquake, and more prone to landslides or debris flow.