Risk Assessment Of Geological Disaster In Zhenba County

The risk assessment of geological disaster is to analyze the probability of occurrence of geological disaster in the study area and evaluate the loss caused by the disaster.At present,a lot of researches have been done on the risk assessment of soil landslide or rock landslide,but the comprehensive risk assessment of the two types of landslide still needs to be further developed.Based on the project of "geological hazard investigation and special research of Zhenba County Scale(I48E021024)in Renhe River Basin of the middle reaches of the Han River",the risk assessment of geological disasters in Zhenba County is carried out.The characteristics of slope structure in Zhenba County are analyzed in detail,and the development law of geological hazards is studied;Based on Bishop method,Monte-Carlo method and improved AHP-fuzzy comprehensive evaluation method,this paper evaluates the hazard of soil slope and rock slope,and analyzes the hazard of slope under the condition of10-year return period,50-year return period and 100-year return period 7-day rainfall.According to the vulnerability of buildings and people in Zhenba County,it systematically evaluates the risk of geological disasters under different rainfall conditions,and classifies them different risk levels.The conclusion is as follows:Under various working conditions,67.6%-79.2% of the low-risk areas are dominated,and there is no extremely high-risk area,Only in the latter two conditions,there are very few high-risk areas of 0.27%-0.98% at the slope toe.The change of the very low risk area is great,19.8% and 2.2% under the first two conditions respectively,and 0 under the latter two conditions.In the first three conditions,the medium risk area increased from 12.6% to 20.93%,and decreased to 20.82% in the last condition.The hazard of XP1001 and XP1005 slopes increases obviously with the increase of rainfall intensity,and it is very likely to slide again under rainstorm conditions.The other slopes are very low and low hazard under various conditions,so the possibility of sliding is very small.In this paper,the soil slope and rock slope are distinguished and different methods are used to evaluate the geological disaster risk of county;The weight determination method based on correlation degree is used to determine the index weight in Fuzzy-AHP.The research results provide a theoretical basis for engineering construction,disaster prevention andmitigation in Zhenba County.