The Risk Disater Assessment Of Geologic Disastere In Sichuan-Tibet Highway

Geological disasters frequently outbreaking brought serious impact on transportation of Sichuan-Tibet Highway, which not only affect the economic and social development but also directly threat people's lives and property. Through field investigation, large collection of literature retrieval of Sichuan-Tibet Highway, combined with expert advice, thesis analyzed geological environment, summarized the development characteristics and influencing factors of geologic disasters, established geologic hazard evaluation index system for risk evaluation of Sichuan-Tibet Highway to provide the basis for prevention and control of geological disasters, the research is as follows:(1) Summarized the development characteristics of geologic disasters of Sichuan-Tibet Highway:through the detailed analysis of development characteristics include geological hazards type and distribution along Sichuan-Tibet Highway, studied internal and external dynamic geological processes which affected the formation of geologic disasters of Sichuan-Tibet Highway.(2) Constructed geologic hazard risk evaluation index system of Sichuan-Tibet Highway:take the geological hazards along Sichuan-Tibet Highway as the research object, analyzed four major geological hazards of debris, collapse,landslide and water damage according to the characteristics and harm degree of geological hazards selected subgrade position, formation lithology, geological structure, rainstorm, average annual rainfall, average temperature, landform type, earthquake intensity and vegetation coverage as the main influence of geological disasters indicators to establish geological hazard risk evaluation index system of Sichuan-Tibet Highway.(3) Geological hazard risk evaluation of Sichuan-Tibet Highway:according to the information collected, combined with GIS and CAD etc software to obtain geological hazard risk map of main indexes. Using AHP method and fuzzy evaluation to determine the index weights. Divided Sichuan-Tibet Highway to 15 segments by cities and counties along the way, evaluated geological disaster risk according to the weight of each index, and finally get risk zoning map with combination of geological hazard elements and comprehensive consideration.Sichuan-Tibet Highway can be divided into dangerous area, high easy-happening area, medium easy-happening area, low easy-happening area, each in terms of their sections of 2,7,5,1. The dangerous area is 2.4% of total Sichuan-Tibet highway length, and it is 52.2 km. The high easy-happening area is 43.8% of total highway length, and it is 941.1 km. The medium easy-happening area is 40.4% of total highway length, and it is 867.1 km. The low easy-happening area is 13.4% of total highway length, and it is 288.6 km. The results is actual.