地震诱发滑坡破坏及失稳运动全过程的流形元模拟

Manifold Element Simulation of the Entire Process of Earthquake-induced Landslide Damage and Instability Movement

强震诱发的滑坡灾害常对自然环境和社会活动造成严重的破坏,为了对地震诱发滑坡风险进行评估、降低滑坡灾害影响,需要开展岩石边坡的地震动力响应和破坏后的失稳运动过程的研究。采用可模拟连续-离散问题的流形元方法对地震诱发的东河口滑坡动力响应和失稳破坏后的运动过程进行了模拟,对比了滑床地震波在岩体中传播对滑坡体动力响应、运动过程及堆积形态的影响。结果表明,与将滑床视为刚性的传统处理方法相比,通过将滑床视为弹性体可以正确地模拟地震波在山体内的传播过程以及斜坡表面动力响应的差异,所得到的滑坡体最终堆积形态与实际地形更吻合,研究成果可为地震诱发滑坡灾害评价提供工程参考。

Landslide disasters induced by strong earthquakes often cause serious damage to the natural environment and social activities.In order to assess the risk of earthquake-induced landslides and reduce the impact of landslide disasters,it is necessary to carry out the seismic dynamic response of rock slopes and the instability movement after damage.process research.The manifold element method that can simulate continuous-discrete problems was used to simulate the dynamic response and movement process of the earthquake-induced Donghekou landslide after instability and damage.The propagation of seismic waves in the slide bed in the rock mass was compared with the dynamic response and movement of the landslide body.process and accumulation morphology.The results show that compared with the traditional treatment method of treating the slide bed as rigid,by treating the slide bed as an elastic body,the propagation process of seismic waves in the mountain body and the difference in dynamic response of the slope surface can be correctly simulated.The resulting landslide body finally The accumulation shape is more consistent with the actual terrain,and the research results can provide engineering reference for earthquake-induced landslide hazard assessment.