Risk Assessment Of Geological Hazard Of Slope In The Deep Valley Region Of Southwest China

The Slope geological hazard are widely developed in Mountains of Southwest China, slope mainly formed under the action of gravity of a product and slope will under the influence factors of rainfall, earthquake, human engineering activities further accelerated deformation and failure. Slope geological disasters continued to threaten people's lives and property safety; According to incomplete statistics, only in 2014 a year the country has more than 1 people were killed in the landslide geological disasters, direct economic losses of more than 1 billion. In this paper, based on the "Southwest deep valley area of geological disasters evaluation" project. In the field investigation and remote sensing interpretation based, combined with the collected data and of Tumen map range of geological hazard risk evaluation.1, According to field investigation there have total 179 slope deposits in research area, the collapse of deposits are 117, the landslide deposits are 62; These disasters mainly concentrated in the Tumen River and human activities area. The collapse of the development is mainly affected by stratum lithology, elevation, slope degree, slope, road, human engineering activities, the impact of the earthquake, the landslide of the development is mainly by lithology, slope, slope, drainage, roads, human engineering activities, rainfall, earthquake influence.2,Base on the research and analysis of slope geological hazard development features and distribution rules to reasonable select the slope geological hazard risk evaluation factors of which the basic factors, predisposing factors and historical factors. Firstly, the basic factors and predisposing factors in the study area were susceptibility evaluation. After obtaining prone zoning and evaluation by historical factors on the study area for risk assessment and evaluation of the results: high risk area, high- low risk area, low risk area and extremely low risk area.3, Through the selection of population density, building density, road density, land use, economic five factors in the study area were vulnerability assessment. Vulnerability assessment difficulties is the impact indicators of the acquisition, this paper to obtain the influencing factors by the special treatment. Combining AHP through vulnerability index calculation model, using raster calculator of Arc GIS to divide vulnerability areas: high vulnerability area, high- low area of vulnerability, low vulnerability area, extremely low vulnerability area.4, On the basis of the risk and vulnerability, through the risk = danger *vulnerability this model, using the Arc GIS of the grid function to divide and evaluate the risk of the study area.5. Geological works began to work in 1:50000 geological disaster survey in recent years and 1:50000 geological disaster risk assessment research is less in our country; By the amount of information of objective method combining with semi quantitative AHP to risk zoning and evaluation of slope geological hazards in the study area, the evaluation result is in line with the actual situation; For slope geological hazard vulnerability research. In this paper, the more special and novel method to obtain the vulnerability index in the study area, not only reduced the vulnerability of the difficulty, but also to improve the precision of vulnerability assessment. Base on hazard evaluation and vulnerability evaluation and using the evaluation model that have been identified by universal expert scholars to risk zoning and evaluation in the study area, evaluation method and evaluation of the results is not only in conformity with the actual situation, but also for the future risk zonation and evaluation of geological hazard to provide reliable reference.