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

Abstract

A typical multi-stage structural surfaces landslide mass located in Sichuan Province, SW 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 analysed and studied. The stability characteristics of four levels of structural slip surfaces on the main section of the landslide mass under natural, rainstorm and earthquake conditions were comprehensively analysed using the transfer coefficient method and Geo5 geotechnical analysis software. The results show that the stability of the four slip surfaces ( ab , bc , ad and ae ) of the landslide mass is basically stable, basically stable, stable and stable under natural conditions; basically stable, less stable, stable and stable under earthquake conditions; and less stable, unstable, stable and stable under rainstorm conditions. It is found that the stability of the two shallow slip surfaces ( ab and bc ) is relatively poor. An anchor support design was chosen to reinforce the landslide mass, and the stability of the supported landslide mass was verified by Geo5 software.