降雨入渗对双层滑带滑坡的稳定性影响研究

Study on the effect of rainfall infiltration on the stability of double-layer slipway landslides

文章针对库岸双层滑带滑坡,利用有限元分析方法GEO-STUDIO,开展了降雨入渗条件下双层滑带滑坡的稳定性研究。结果表明:对于双层滑带滑坡,降雨对浅层滑带的稳定性影响大于深层滑带;由于深层滑带的存在,在降雨入渗过程中,滑坡的浸润线变化幅度滞后程度变大,相较于浅层滑带单独存在时浮托力减小,减弱了浅层滑带稳定性的变化幅度;由于浅层滑带的存在,在降雨过程中,雨水入渗速度有所加快,相较于深层滑带单独存在时的安全系数略低;在降雨过程中,深层滑带的存在使得浅层滑带的稳定性升高,而浅层滑带的存在可在一定程度上降低深层滑带的稳定性。

In this paper, the stability of the double-layer slipway landslide under rainfall infiltration conditions was studied by using the finite element analysis method GEO-STUDIO. The results show that for double-layer slipway landslides, the stability effect of rainfall on shallow slipways is greater than that of deep slipways. Due to the existence of the deep slipway, in the process of rainfall infiltration, the magnitude of the change of the infiltration line of the landslide becomes greater, and the floating force is reduced compared with the existence of the shallow slipway alone,thereby weakening the change amplitude of the stability of the shallow slipway. Due to the existence of shallow slipway, the rate of rainwater infiltration is accelerated during the rainfall process, which is slightly lower than that when the deep slipway exists alone. During rainfall, the presence of deep slipway increases the stability of shallow slipway, while the presence of shallow slipway can reduce the stability of deep slipway to a certain extent.