降雨诱发滑坡倾斜变形试验研究

Experimental Research on Inclination Deformation of Landslide Induced by Rainfall

采用地质力学模型试验方法研究降雨诱发滑坡的演化过程。利用HCA726S倾角传感器、微型土压力传感器、孔隙水压力传感器、三维激光扫描仪等分别对滑坡模型倾角、应力、变形、坡面形态等进行高精度监测,通过倾斜变形、应力、位移云图及坡面形态变化,分析研究了滑坡倾斜变形及应力响应特征,总结了滑坡演化失稳过程。依据倾角传感器监测得到的角度-时间曲线,可以将滑坡演化过程分为基本稳定阶段、变形初始阶段和变形失稳阶段,并且由倾角传感器监测的数据与滑坡破坏过程中的坡面形态、变形云图以及坡体应力的变化基本一致。在变形初始阶段和变形失稳阶段,角度变化率的倒数与时间具有线性关系,建立了二者的线性方程。当线性方程的倾斜率倒数为0 min/(°)时,可得出滑坡开始破坏和完全破坏的时间。利用该线性方程预测的滑坡破坏时间与滑坡实际破坏时间基本一致。

The geomechanical model test method is used to study the evolution process of rainfall induced landslide.HCA726S inclination sensor,micro soil pressure sensor,pore water pressure sensor,3D laser scanner are used to monitor the inclination,stress,deformation and slope morphology of landslide model with high accuracy.Based on the slope deformation,stress,displacement nephogram and slope morphology change,the slope deformation and stress response characteristics of the landslide are analyzed,and the landslide evolution and instability process are summarized.According to the angle time curve monitored by the inclination sensor,the landslide evolution process can be divided into the basic stability stage,the initial deformation stage and the deformation instability stage.The data monitored by the inclination sensor are basically consistent with the slope morphology,deformation nephogram and the change of slope stress during the process of landslide failure.In the initial deformation stage and deformation instability stage,the reciprocal of the angle change rate has a linear relationship with time,and a linear equation is established.When the reciprocal of the slope rate of the linear equation is 0 min/(°),the time when the landslide starts to fail and completely fails can be obtained.The failure time of landslide predicted by the linear equation is basically consistent with the actual failure time of landslide.