THE ANALYSIS OF GEOLOGICAL FEATURES AND FORMATION MECHANISM OF ERLANG LANDSLIDE IN GULIN COUNTY

Zhongdu landslide was the largest, strongest harm, and most difficulty management in Erlang town. Although after many governance, the landslide was still in the creep deformation. Through the field survey, they were analyzed firstly that the geological structure, landform, stratum lithology, and human activities in the landslide area. And then combined with regional geological structure, cause of the mechanism of the landslide are analyzed in detail. Zhongdu landslide was the ancient landslide collapse and local resurrection. In the ancient, there was a massive landslide in Erlang town caused by the Xiangjiachang fracture and the Chishui river erosion on the front of the slope. And the river was blocked by the landslide deposit. After, the landslide dam was failure, the front edge of the slope was long-term erosion by the river, and lead to the resistance sliding section of the slope reduced. In addition, Shajing fracture was hydraulic conductivity, and the tendency to the deposit landslide, dip Angle of 75.And the human activities on the slope were frequent. These were the main factors which caused the landslide sliding.