Risk Assessment Of Geological Hazards After The Earthquake In Qiaojia County, Yunnan Province

After the August 3rd Ludian earthquake in Yunnan, triggered a lot of earthquake secondary geological disasters, causing heavy casualties and economic losses. The geological environment condition is complicated in Qiaojia County, and the vegetation rate is low and the distribution is not uniform. The entire landscape perplexing, deep valleys, high mountains and lofty hills, East and west sides of high terrain, the middle flat. The surface soil mass is loose and crack, causing the landslide, collapse, debris flow, ground collapse and other secondary geological disasters.The Zhaotong Qiaojia county of geological disasters after the earthquake as the research object, in the field geological survey, geological disaster data analyzing basis, analysis of geological disaster in Qiaojia county announced rules and development characteristics and formation conditions, based on the geological hazard formation conditions and influencing factors analysis, selection of slope, exposure, lithology, structure, water system and human engineering activities factors, the evaluation index system is established. By using GIS, fuzzy comprehensive evaluation method of Qiaojia county, geological hazards, evaluation and zoning. The results obtained are as follows:(1) the regional geological background and the engineering geological conditions of the area in Qiaojia county were analyzed in detail, and the complexity of the geological environment conditions in Qiaojia county was realized.(2) according to the interpretation of the various factors in the Arc GIS layer, through the comparison can be drawn, the partition of this paper and Qiaojia County geological hazards are generally consistent, mainly concentrated in the vicinity of the river basin and human activities.(3) in this paper, the risk assessment of geological hazards should be carried out, and some suggestions are put forward. To provide theoretical support for the post disaster reconstruction work in Qiaojia County, and to provide support and assistance to the people of Qiaojia County in a greater degree.