Geological Disasters Geo-hazard Susceptibility Evaluation Of Across The Gao Ligong Mountains Area In Darui-Railway (The High Earthquake Intensity Region)

Darui-Railway through in south of Hengduan Mountains which is in the south-east of qinghai-tibet plateau. It is the firstⅠlevel railway which through the Hengduan Moun- tains in our country. The geological environmental conditions of the research region that across Gao Ligong Mountains area is complex.There devleloped many geological hazards, such as collapses, landslide, debris flow and so on. With the implementation of the strategic development of western China, various kinds of linear geo-engineering projects( like highway, railway, oil pipeline) are large-scale constructed in this area.The engineering geological evaluation is under the spotlight. Wenchuan 8.0 earthquake to the state's infrastructure caused great destruction, economic lost serious, the rescue work hard to develop smoothly. So, thesis aims at the need of railway lines location, to evaluate the susceptibility of geological hazard for rainfall condition and strong earth- quake + rainfall condition.Based on the full analysis geological hazard material which survey in the field, sum- marize the research area geological hazards type and distribution, conclude the influen- cing factors of geological disasters geo-hazard susceptibility. Combined with the geol- ogical hazards distribution of Wenchuan 8.0 earthquake proposing"Three factors ten effect"and Longling 7.4 earthquake's, establish rainfall condition and strong earthqua- ke + rainfall condition evaluation index system which take the historical factors, the basic factors and inducing factors as the first level evaluation index. Compared with the rainfall condition, the other considering the faults control factors which associated with earthquake. Both conditions are selection fuzzy comprehensive evaluation model as the basic mathematical model. Using analytic hierarchy process( AHP) determining the evaluation indexes weights. The evaluation process based on ArcGIS software platform. 1:50000 scale navigation piece interpretation frontpiece is divided into about 1.49 million sssessment units. Choose nujiang river fracture, lushui-ruili fracture, longling- lancang river fracture as the seismogenic fault of strong earthquake + rainfall condition. Two kinds of geological disasters geo-hazard susceptibility are evaluated, that accord- ing to four level geo-hazard susceptibility, they are low in geo-hazard susceptibility, geo-hazard susceptibility, high geo-hazard susceptibility and remotest geo-hazard susceptibility.The evaluation results show that different conditions and under different fracture seismogenic its evaluation results significantly different. The area of the remotest geo- hazard susceptibility region is around 200~300 km2 when in the rainfall condition and in the condition of nujiang river fracture, lushui-ruili fracture, longling-lancang river fracture seismogenic. They accounted the total area for 7.2%, 8.4%, 9.2%, 6.7%. The remotest geo-hazard susceptibility area along the railway lines are mainly concentrated in eastern of nujiang river deep steep zone, and the zone of fracture intensive develop- ment in Gao Ligong Mountains and Ao Zidi. Contrast the distribution of geological hazards of Longling earthquake in 1976 ( nujiang river fracture seismogenic), the eva- luation results and objective reality are mostly fitted. A strong technical support in engineering construction is provided by evaluation model.