Stability analysis before and after support of a multi-stage structural surfaces landslide mass

Abstract

A typical multi-stage structural surfaces landslide mass is located in Sichuan Province, Southwest China, is used as the research object. Based on the site survey and related data collection and analysis, the topography, geomorphology, stratigraphic lithology, and geological structure of the study area were identified, and the engineering geological conditions and signs of deformation and damage of the landslide mass were analyzed and studied. The stability characteristics of four different levels of structural sliding surfaces on the main section of the landslide mass under natural condition, condition of rainstorm, and condition of earthquake were comprehensively analyzed using the transfer coefficient method and Geo5 geotechnical analysis software. The results show that the stability of the four sliding surfaces ( ab, bc, ad , and ae ) of the landslide mass is basically stable, basically stable, stable, and stable under natural condition; basically stable, less stable, stable, and stable under condition of earthquake; and less stable, unstable, stable, and stable under condition of rainstorm. It is found that the stability of the above two slip surfaces is relatively poor. Then, the anchor support design was chosen to reinforce the landslide mass, and the stability of the supported landslide mass was verified by Geo5 software.