Study On Chongqing ChengDongXiang Landslide Risk Analysis And Control

Landslide disaster is one of the most common hazards of geological disasters, also is a kind of harm is the most serious disasters, not only constitute a great threat to human life and property security, will cause serious damage to the environment.Landslide risk analysis can be targeted for landslide prevention and control to provide effective basis, now has become a perfect land use planning and the powerful tool of the development of landslide disaster affected zone, and reduce the landslide potential casualties caused by the most effective way.First, on the basis of predecessors’ research results, the existing landslide risk analysis method of the vulnerability of hazard-affected bodies evaluation method was improved, change than just the vulnerability of hazard-affected bodies is defined as the average loss rate of hazard-affected bodies and the vulnerability of hazard-affected bodies as a body to body of hazard-affected bodies vulnerability and strength of landslide hazard in space position of hazard-affected bodies under the joint action of the results.In the landslide risk assessment considering the vulnerability of hazard-affected bodies and harm intensity to a review of the vulnerability of hazard-affected bodies, to improve the accuracy of the landslide risk assessment.Second, in the Liangping county ChengDongXiang landslide as the research object, using the improved method for risk analysis,The results are as follows:Landslide stability coefficient is1.03when in a natural state, is in unstable condition, the possibility of sliding;When heavy rains or sounds very stability coefficient is0.50, is in unstable condition, sliding probability.To predict once the landslide instability will endanger scope is:The whole landslide and the preceding50meters wide,90meters long area, covers an area of about7600square meters,According to the damage intensity space distribution, harm scope can be divided into four hazard intensity of different areas.According to the material structure or age assessment of the vulnerability of hazard-affected bodies, combined with the location of the intensity of landslide hazard vulnerability value of hazard-affected bodies.The time space of hazard-affected probability of hazard-affected bodies, by in the size of the landslide hazard scope of hazard-affected bodies and trapped within the scope of landslide hazard is decided by the time.After getting ChengDongXiang landslide instability probability, the vulnerability of hazard-affected bodies, hazard-affected probability, using risk assessment formula:Natural conditions under the condition of personnel loss risk degree is3.59, material loss risk degree is928015.06yuan.Saturated condition under the condition of personnel loss risk degree is6.38, material loss risk degree is1649804.54yuan.Finally, according to the landslide risk evaluation criterion, determining ChengDongXiang landslide risk is the unacceptable level risk.And for ChengDongXiang landslide prevention and control of actual situation proposed Suggestions:One is through (cut) ditch project, reducing surface water infiltration;Second, set up7root pile at the bottom of the landslide, improve the stability of the landslide.