Research On Risk Assessment Of Rock Cutting Slope Stability For Mountainous Operation Expressway

Aiming at the problems of slope stability and operation safety in mountainous operation expressway,this thesis relies on the maintenance project of rock cutting slope in Yueqian Section(Yuexi～Qianshan)of G3 5 Expressway from Jinan to Guangzhou in Anhui Province.The complexity and uncertainty of influencing factors of slope stability were fully considered.Based on the risk management theory,using the CRITIC method,combination weighting method of game theory and cloud model,the stability risk of rock cutting slope were analyzed and evaluated for the mountainous operation expressway.Thus,it can provide an effective method for scientific and reasonable evaluation of the actual slope stability risk.(1)By referring to the relevant literatures of slope stability risk assessment at home and abroad,the risk factors that may affect the stability of rock cutting slope in mountainous operation expressway were summarized and analyzed.Combined with the results of field investigation,these risk factors were identified by using the method of risk identification.Finally,the risk factors of rock cutting slope stability were determined for the mountainous operation expressway.(2)On the basis of the results of risk factor identification,and following the basic principle of evaluation index screening,the initial index system of risk evaluation of rock cutting slope stability was established for the mountainous operation expressway.According to the practice of rock cutting slope engineering in mountainous operation expressway,the initial index system was further accurately selected by CRITIC method,and the risk evaluation index system of rock cutting slope stability in mountainous operation expressway was established in accordance with the screening results.(3)Using the characteristic of cloud model to transform qualitative concepts into quantitative values,and according to the fuzziness and uncertainty of risk assessment index of slope stability,the advantages of cloud model in slope stability risk assessment were analyzed.In order to avoid the calculation one-sidedness of single weight,the subjective and objective weights obtained by AHP method and CRITIC method were coupled with game theory,which improves the scientific nature of index weight.On this basis,a risk assessment model of slope stability based on cloud model was constructed.(4)Combined with the actual engineering of rock cutting slope in mountainous operation expressway,the risk evaluation model of slope stability based on cloud model was applied to analyze and evaluate the slope stability risk.The final evaluation result is consistent with the actual situation.The risk evaluation model was compared with other evaluation methods to further verify the applicability and effectiveness of cloud model.