滑坡侵蚀离散元分析研究  

STUDY ON LANDSLIDE EROSION BY DISCRETE ELEMENT METHOD

作　　者：郑书彦[1] 李占斌[1] 李甲平 苟建忠 

机构地区：[1]西安理工大学水利水电学院 [2]甘肃省宁县气象局,甘肃宁县745200 [3]甘肃省地勘局,甘肃天水725400

出　　处：《岩石力学与工程学报》2005年第12期2124-2128,共5页Chinese Journal of Rock Mechanics and Engineering

基　　金：中国博士后科学基金资助项目(2003034413);陕西省自然科学基金资助项目(2000D08)

摘　　要：首先介绍了离散单元法分析原理,用铜王公路2#滑坡侵蚀实例建立了地质模型,根据黄土中实际最为发育的垂直节理面以及层面来划分单元及建立计算模型,滑坡体被这2组结构面分割成297个单元,滑体以下的滑床基岩部分作为固定单元处理。采用离散单元法对滑坡侵蚀运动过程中各演化阶段的平均速度、平均加速度,滑坡侵蚀体后缘、中部、前缘的合力、合力矩进行了分析研究,由此可将滑坡的演化过程划分为5个运动阶段:启动破坏、剧动加速、高速运动、碰撞减速、停滞缓动。The principle of discrete element analysis method is introduced and applied to simulate a real case of the No.2 landslide on Tong-Wang highway. The geological model is built up with consideration of vertical joints and strata planes as discrete discontinuities in loess. Then the landslide body is meshed into 297 units by the two sets of structural planes, while the units under the sliding bed which is bed rock are treated as fixed. Furthermore, discrete element method is used to analyze the typical characters of the erosion evolution process of landslide. The average velocity, average acceleration, resultant forces and moment in back, middle and front portion of the landslide are calculated. The results suggest that the evolution process of landslide can be divided into five stages, i.e. initial breaking stage, extensive accelerating stage, high speed moving stage, bumping deceleration stage and slow braking stage.

关 键 词：岩土力学 滑坡侵蚀 离散元 演化过程 

分 类 号：TU43[建筑科学—岩土工程]