礼县烂山滑坡特征及地震-降雨耦合作用下稳定性分析

在对礼县烂山滑坡进行工程地质调查的基础上,结合区域环境研究滑坡的主要特征和稳定性影响因素,得出其高陡的地形、不稳定的岩土体、已有的变形破坏以及研究区的降雨、地震和人类活动等因素造成该滑坡的发展趋势为稳定性差,危险性大。结合Geostudio软件对烂山滑坡分别处于天然、降雨、地震、地震降雨耦合四种状态下的14种工况进行数值模拟,定量分析了降雨强度、降雨持时、地震动时程三个参数对烂山滑坡非饱和土渗流、地震动力响应以及稳定性的影响,结果表明地震与降雨耦合作用对滑坡的稳定性有累计折减效应,地震对烂山滑坡的稳定性起控制性作用,降雨起到促进作用使得滑坡更容易发生。

Characteristics of Lanshan Landslide in Lixian County and Stability Analysis under Earthquake - Rainfall Actions

On the basis of engineering geological survey, combined the regional environment, the main characteristics and the factors affecting the stability of the Lanshan landslide in Lixian county is studied in this paper. It is concluded that the development trend of the landslide is poor and the risk is big, that caused by its high and steep terrain, unstable rock and soil mass, the deformation and failure, the rainfall, earthquake and human activities in the research area. The landslide in such 14 working conditions as the natural, rainfall, earthquake and coupling of earthquake and rainfall is simulated by Geostudio, and the impact of rainfall intensity, rainfall duration, ground motion on the seepage of unsaturated soil, the seismic response and the stability of Lanshan landslide is quantitative analyzed. The results show that the stability of the landslide is cumulative reduction under earthquake - rainfall actions, and the earthquake plays a controlling role, the rainfall plays a promoting role in the stability of the landslide,