基于条分法的边坡演化动力学预测模型

A Dynamic Prediction Model Based on Slice Method for the Evolution of Slopes

在传统条分法的基础上,考虑降雨引起地下水位变化,采用太沙基一维固结理论描述超孔隙水压力消散,基于条块连续变形假定,提出了一种新的边坡演化动力学预测模型。该模型认为滑体内部的速度和变形具有不均匀性,条块变形引起条间力变化,结合牛顿运动定律进行滑坡动力学分析,可以模拟滑坡运动的全过程,并预测滑坡的最大滑速和滑程。采用该模型模拟了千将坪滑坡启动以后的运动过程,结果与实际基本相符。表明该模型具有较大的工程应用价值。

On the basis of traditional slice method and assuming that the deformation of slice is continuous, a dy- namic prediction model for the evolution of slopes is developed. In the model, the groundwater level variation caused by rainfall is taken into account, and the dissipation of the excess pore-fluid pressure in the saturated layer is governed by Terzaghi＇ s one-dimensional consolidation theory. It is believed that the speed and deformation of the sliding mass are of inhomogeneity, and the changes of inter-slice forces are caused by the deformation of slice. Through dynamics analysis of landslide using Newton＇ s laws of motion, the new model can simulate the whole slid- ing process and predict the maximum sliding speed and maximum sliding distance. The model is adopted to simu- late the movement process of Qianjiangpin landslide, and the result of computer simulation is in well accordance with actual cases.