关键词: 滑坡, 构造应力, 地震, 北川断裂带, 龙门山断裂

Abstract: The Beichuan fault zone is located in the middle part of the central Longmenshan fault zone, Sichuan, where the new and old landslides develop well and the tectonic activity is the dominant factor affecting landslides in the area. The influence of tectonic activity on landslide disaster is analyzed by means of documentary record, field investigation, etc. The results show that:① The integrality of the surface rock mass was reformed by lateral compression and uneven elevation of the structure, which caused structural differences of the rock masses located at different structural positions or slopes and further controlled the spatial development law of landslide. At the same time, the spatial exposure relations of the detailed structural plane formed the initial boundary conditions for the occurrence of landslide.② As a violent external representation of tectonic activity, seismic dynamic load induced landslide directly and loosed the rock mass at the same time.③ After "5.12" earthquake, the direction of regional tectonic stress was nearly 90 degrees deflection, aggravating the deformation and failure of loosed rock mass. The post-earthquake stress deflection was the main internal dynamic factor affecting regional slope stability

Key words: landslide, tectonic stress, earthquake, Beichuan fault zone, Longmenshan fault