| The contradiction between rapid urban development and geological disasters in the Loess Plateau of western Shanxi is becoming increasingly prominent.With the extreme rainfall events are becoming more frequent and the intensity of engineering activities are increasing,the characteristics of loess geo-hazards are becoming more frequent occurence,wide distribution,great harm,and heavy casualties are increasingly obvious,seriously affected the security operations of city and personnel property security.This study takes Linxian in Lvliang City as an example to carry out a comprehensive evaluation of the slope stability in the urban areas of the Loess Plateau in western Shanxi Province.The main conclusions are as follows:(1)Based on field geological surveys and geological hazards surveys,58 loess-hazard sites within urban areas were identified,geological disaster development characteristics and disaster models were summarized;6 slope areas and 96 slope units were divided.Field investigations were carring our for slope units one by one,and the types of slope structures were summarized,in the meantime identifing the stability of them.(2)Based on the limit equilibrium method and Monte Carlo simulation method,the Slope module of Geo-studio software was used to calculate the stability factor and instability probability of the slope units,and the stability of the slope units were analyzed.The results show that: under natural conditions,the overall stability of the slope units are well around the town.most of them are stable;under the rainfall conditions,the overall stability of the slope units are reduced,and the partial areas of slope present basically stable and potentially unstable.(3)Using SINMAP model to simulate and calculate the regional slope stability index under different rainfall conditions,the results show that:with the increase of rainfall intensity,the stable area are gradually decreased;under the extraordinary rainstorm conditions,the stable area accounts for about 3/5.The regional slope stability is significantly reduced;60% of the existing geological disaster sites are located in unstable and extremely unstable areas,and the numerical calculation results are in good agreement with the actual distribution of geological disasters and the results are reliable.(4)Based on comprehensive field qualitative identification,stability calculation of monomer slopes and regional slope stability index simulation,a comprehensive evaluation of the slope stability of Linxian in the Loess Plateau of western Shanxi was conducted: Under natural conditions,the number of stable slope units accounts for 80.2%,the area of stable slopes is 72.78%;under rainfall conditions,the number of stable slopes is 66.7%,the area of stable slopes is 62.12%;the calculation results of slope stability and the simulation results of regional slope stability index are mutually verified and the results tend to be consistent. |
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