湖北秭归千将坪滑坡微破裂过程震动分析

Vibration Analysis of Micro-rupture Process in the Qianjiangping Landslide in Zigui,Hubei Province

基于湖北秭归千将坪岩质滑坡地形、地质、水文特征,运用GeoStudio软件中的QUAKEW模块建立滑坡震动分析模型。通过设置土层、岩层动弹性模量和泊松比,处理并加载卢家山台记录的四次破裂事件数据,并进行动力学分析,模拟千将坪滑坡的破裂蠕滑滑动过程。结果表明,千将坪滑坡不单受自身静力作用,还经历了微破裂-蠕滑-再破裂-蠕滑-滑动的微破裂动力过程,为岩质滑坡预警的可行性提出了新的探索思路。

In this study,based on the topographic,geological,and hydrological characteristics of the Qianjiangping landslide,we have built a vibration analysis model using the QUAKEW module of GeoStudio software.We set the dynamic elastic modulus and Poisson’s ratio of the soil and rock;further,we processed and loaded the data of four rupture events recorded by Lujiashan seismic station.Then,we used the model to simulate the landslide creep and slide processes.The results show that the Qianjiangping landslide was under static load and also experienced a microrupturing process that involved following subprocesses in sequence:microrupture,creep slip,rerupture,creep slip,and landslide.This model could provide some new ideas for feasibility studies on rock landslide forecasts.