滑体失稳后运动过程三维弹簧变形块分析模型

 滑坡灾害危害程度评估需要掌握滑坡运动特征，而目前的研究主要基于定性分析模型，很难进行定量预测。为克服这一困难，建立一种简化的三维弹簧变形块模型，定量预测滑坡失稳后滑体运动过程。假设滑坡的运动形式是连续的，且滑体是可变形的，将滑体分为侧面竖直的三维条柱。考虑滑体内在变形，对三维运动方向受力和变形进行分析。根据作用于条柱侧面的力–变形关系，获得条柱在滑动过程中的变形与受力状态。考虑到条柱中能量的积累和释放，同时考虑摩擦引起的能量耗散，建立任意时刻滑体的加速度、速度和位移计算公式，获得滑坡在三维滑动过程滑动的最大距离、运动的最大速度及滑动历经的时间等。为实现滑坡滑动过程的三维可视化，基于Visual Basic语言程序编制滑坡失稳后运动过程分析程序，分析武隆鸡尾山滑坡的滑动距离、滑动的最大速度以及滑动历经的时间，对比分析表明，该模型与现有的软件模拟结果比较吻合。

A THREE-DIMENSIONAL MODEL WITH SPRING-DEFORMABLE-BLOCKS FOR POST-FAILURE MOTION OF LANDSLIDES

Assessment of landslide hazards often requires good knowledge of the moving characteristics of landslides. However，the current analysis is mainly based on qualitative models，which are not suitable for quantitative analysis. To overcome this shortcoming，a three-dimensional model of spring-deformable-blocks was formulated to produce the motion of landslides. The motion of landslides was assumed continuous and variable，and the sliding body was divided into a number of deformable columns. With the force acting on the side face of columns，the deformation of the column was obtained according to the relationship of force-deformation of sliding body. The formulas for the acceleration，velocity and displacement of sliding body were established considering the accumulation and the release of the deformation energy. The proposed model was implemented in a program based on Visual Basic for the visualization of the motion of landslides. The program was applied to analyze the sliding time，the maximum velocity and the displacement of the sliding body of Jiweishan landslide in Wulong， Chongqing. The results from the simulation was found to be in good agreement with the existing numerical results.