Abstract: Hunhe fault is the most important active fault in Fushun City, Liaoning Province. In order to deeply investigate the development of geological disasters along Hunhe fault, understand the relationship between disaster formation and the preexisting faults, and provide scientific basis for the prevention and early warning of geohazards. In this paper, we adopted the field investigation method and the ground deformation monitoring data to study. The disaster types and characteristics of Hunhe fault zone are clarified, and the formation mechanism of the fault zone disaster is analyzed. The results show that the ground fissures distributed along the hidden fault area, and extended 3002 400 m; The mining activities in the south of Fushun City induced the local tension and opening of the preexisting weak fault surface, which then extended and penetrated to the surface to form ground fissures. In the bedrock area where the fault extends, small landslides distributed along the fracture and the affected zones of the fault, and the main sliding direction is perpendicular to the fault strike or inclined at a large angle. These landslide formation mechanisms are related to the structural plane inside the rock mass. Especially, the structural planes along the slope  were coupled with the slope to form a sliding structure. Under the action of longterm rainfall, the structural planes soften, penetrate, and accelerate the creep deformation of rock and soil mass, and finally forms a landslide.

Key words: Hunhe fault, ground fissure, landslide, formation mechanism, structural plane