关键词: 岩土工程, 陇南石鸡坝乡, 地质灾害, 信息量法, 易发性评价, 危险性评价

Abstract: According to the latest investigation and cataloguing data of geological hazards in Shijiba township of Baishuijiang River Basin in Longnan area, Gansu province, and on the basis of the analysis of the geological environment background and the characteristics of the development and distribution of geological hazards in the study area, the influence of disaster-causing factors on the development and distribution of geological hazards was analyzed comprehensively by using Arcgis 10.2 software platform. The disaster-causing factors included such as topography and geomorphy, geological structure, engineering geological rock formation, slope structure type, river erosion, vegetation cover, rainfall, earthquake and human engineering activities. By using information quantity method, the geo-hazard susceptibility and geo-hazard risk were assessed and zoned successfully. The method of combining information quantity method with qualitative evaluation method was used to realize the division of the susceptibility and risk assessment of debris flow geological hazards. The research results show that the area with high risk of landslides covers 14.22 km2, accounting for 3.30%; the area with medium risk of landslides covers 51.05 km2, accounting for 11.83%; the area with low risk of landslides covers 95.32 km2, accounting for 22.09%; the area with little probability of landslides covers 270.93 km2, accounting for 62.79% of the total study area. There are 17 high risk debris flows, 59 medium risk debris flows and 1 low risk debris flow. The assessment results can provide reference for the geo-hazard risk assessment and geo-hazard prevention and mitigation.

Key words: geotechnical engineering, Shijiba town in Longnan area, geo-hazards, information quantity method, susceptibility assessment, risk assessment