倾倒式岩质崩塌运动过程数值模拟分析

Numerical analysis of the movement process of toppling fall

在延长县崩塌详细调查的基础上,采用数值模拟方法对倾倒式岩质崩塌运动过程进行了模拟,分析了其运动规律。根据崩塌的破坏形式和运动特点,将倾倒式崩塌的整个运动过程分为四个阶段:岩体原有节理的开裂变形阶段、岩体沿基座支点的倾倒运动阶段、崩塌体在一定初速度下的落体运动阶段、崩塌体的碰撞与堆积阶段。通过对倾倒式崩塌影响范围的理论计算结果、数值模拟结果和实际调查结果对比得出,数值模拟结果和实际调查结果基本一致,两者远大于理论计算结果,因此数值模拟结果可作为倾倒式崩塌的影响范围,可为崩塌灾害的防治提供科学依据。

Based on the detailed investigation of collapses in Yan chang City, The movement process of topplingCollapses is simulated with numerical simulation methods, and movement law of toppling collapses is analysised.According to collapses failure mode and movement characteristics, The whole movement process of topplingcollapses isdivided into four stages ： the cracking and deformation of rock mass joints, the toppling of rock mass along the fulcrumbase, the falling of collapse bodies in certain initial velocity, collision and accumulation of collapse bodies;Accordingto the result of theoretiacal calculation and numerical simulation and actual survey , the result of the numericalsimulation and actual survey is the same, and they are all above the theoretiacal calculation. Therefore, the results ofnumerical simulation can be used as the influence scope of toppling collapses, and it provides a scientific basis for theprevention and treatment of the collapse hazard.