降雨诱发滑坡的流-固耦合特征及稳定性分析

Flow-solid Coupling Characteristics and Stability Analysis of Rainfall-induced Landslides

降雨是诱发滑坡的重要原因,滑坡灾害造成了大量的人员和财产损失。以教师新村滑坡为例,基于有限元方法和非饱和土力学理论建立滑坡流-固耦合计算模型,分析滑坡在降雨条件下的渗流、应力应变和稳定性变化规律。结果表明,教师新村滑坡稳定性受降雨影响较大。降雨受斜坡地形因素控制很难直接入渗至滑体深部,在强降雨条件下滑坡整体稳定性变化较小,滑坡中后部易发生浅表层变形,模拟结果与野外实际调查情况一致。研究成果对降雨诱发滑坡的监测预警和防治工作有一定指导作用。

Rainfall is an important reason to induce landslides,which have caused a lot of personnel and property losses.Taking the Teacher's new village landslide as an example,based on the finite element method and unsaturated soil mechanics theory,the calculation model of landslide flow-solid coupling is established to analyze the seepage,stress-strain and stability change law of landslide under rainfall conditions.The results show that the landslide stability of Teacher's new village is greatly affected by rainfall.The rainfall is controlled by slope topography factors,it is very difficult to directly infiltrate into the deep part of the sliding body.under the condition of heavy rainfall,the overall stability change of the landslide is relatively small,and the shallow surface deformation is easy to occur in the middle and back of the landslide,and the simulation results are consistent with the actual investigation in the field.The study has a guiding effect on the monitoring,early warning and prevention of rainfall-induced landslides.