Abstract:
With the continuous construction and operation of cascade hydropower stations on Jinsha River, coupled with frequent extreme rainfalls, the geohazards in Huidong County show a frequent tendency, seriously threatening local people's production and living. Based on the collected data of historical geohazards and detailed field geological survey, the paper analyzes and summarizes the development and distribution characteristics of geohazards in Huidong County, and the relationship between collapse-landslide and disaster-inducing factors such as landform, stratigraphic lithology, geological structure, slope structure and human engineering activities combined with GIS analysis method. The results show that the distribution of landslide in the area is affected first by geological structure and engineering geological rock formation, and then by landform and slope structure. The elevation, gradient and slope structure have good correlation with landslide development, while the collapse is controlled by engineering geological rock formation and highly correlated to gradient, relief intensity and slope structure. Considering the main disaster-inducing conditions in Huidong County, the whole county can be divided into four major disaster-pregnant geological condition areas. By description of the disaster-inducing characteristics and development laws in each area, the geological conditions of landslide disaster pregnancy in Huidong County are further recognized, which will expectedly help the local disaster prevention and reduction system, and provide reference for other geological disaster risk investigation and evaluation.