滑坡速度计算的改进条分法

在阐述滑坡速度计算方法的基础上，提出了用改进条分法来进行滑坡速度的计算，该方法选取了沿滑面方向和垂直滑面方向来分析各个块体的受力特征，认为当前条块所受的前后块体相互作用力矢量和沿滑面方向及垂直滑面方向的加速度为零。根据牛顿定律建立动力学平衡方程，求解每一块体在各个运动阶段加速度，然后用基本运动学原理求解各个块体的运动时间及末速度，并与传统的条分法的求解结果进行了对比。本文以新滩滑坡为例，将研究区化分为18条块，用改进条分法求的加速度和速度比一般条分法偏大。

Improved Slice Method for Landslide Speed Calculation

The calculation of landslide speed is very complex. On the basis of the introduction of many research methods, improved slice method is put forward to calculate landslide speed in this paper. The method selects two directions, the direction perpendicular to the slip surface and the direction parallel to the slip surface,to analyze the mechanics of slices and assumes that the value of the acceleration perpendicular to the slip surface of slice is zero and the direction of resultant forces which are from the front slice and the back slice and act on the current slice is parallel to the slip surface. The Newton law is used to establish the kinetics equation of slice and the acceleration of slice is solved at each movement stage; then, the basic principles of kinematics are employed to solve the terminal speed and the movement time of all slices; at last, the results from improved slice method are compared with those from the common slice method. This paper takes the example of Xintan landslide in the Three-Gorges Reservoir area and divides the research area into 18 slices. It comes to the conclusion that the values of acceleration and speed from improved slice method are greater than those from the common slice method.