圆弧面上的降雨滑坡运动特性研究

Study on the Motion Characteristics of Rainfall-induced Landslide with Arc Sliding Surface

为研究降雨诱发沿圆弧形破裂面滑动的土质滑坡的运动特性,基于质点组的运动假设,融入饱和-非饱和土体特性,建立降雨滑坡的运动物理模型,采用有限差分的方法进行求解,从而获得其运动速度、滑动距离等动力学参数,提出了沿圆弧面滑动的降雨滑坡运动学问题研究的一种新方法,并采用该方法对滑坡算例进行研究分析。结果表明:滑坡运动速度呈现先增大后减小的趋势,同时运动速度在极短的时间就达到了最大;滑坡的水平位移随时间的增加而增加,最初阶段滑坡水平位移增加较快,此后增加缓慢直至滑坡停止;该方法能够简单快捷地计算滑坡运动速度和运动距离等运动学参数,进行滑坡危害范围的预测。

In order to analyze the motion characteristics of landslide failure along the arc sliding surface, based on the assumption that landslide was moving as a group of particles motion, the moving physical model of landslide was established with the consideration of the character of saturated-unsaturated soil. The landslide motion velocity and distance was calculated by using the finite difference meth- od. A new method was presented to analyze the motion characteristics of landslide failure along the arc sliding surface. In additional, an example was given to illustration the method. The results showed that the motion velocity of landslide increases first and then decreases, meanwhile in a very short time the velocity increases to the maximum. The horizontal distance increases with the increase of the time, and the horizontal distance sharply increases in the initial sliding stage, then increases slowly till the movement stopping. The method was simple to predict the hazard scope for a rainfall-induced landslide failure along the arc surface.