Sensitivity Ranking Theory based on CRITIC-GRA-AHP Method and its Application in Slope Stability Analysis
Slope stability is the basis of mine safety production.It is of great theoretical and practical significance to study the sensitivity order of influencing factors of slope stability.In view of the fact that the single subjective algorithm is greatly influenced by the subjective and the single objective algorithm has a large deviation from the actual situation and can only analyze the specific working conditions,a sensitivity ranking theory based on CRITIC-GRA-AHP method was proposed.Taking a limestone mine in northwest Sichuan as an example,on the basis of analyzing and determining the influencing factors of slope stability such as slope height,final slope angle,gravity,cohesion,internal friction angle and bulk modulus,the sensitivity of influencing factors of mine slope stability was analyzed by FLAC3D combined with the sensitivity ranking theory based on CRITIC-GRA-AHP algorithm.The results show that the sensitivity ranking of the influencing factors of slope stability under natural condition from large to small is cohesion,slope height,final slope angle,internal friction angle,gravity and bulk modulus.The sensitivity ranking of the influencing factors of slope stability under rainstorm condition from large to small is cohesion,slope height,internal friction angle,final slope angle,gravity and bulk modulus.The sensitivity ranking of the influencing factors of slope stability under seismic condition from large to small is slope height,internal friction angle,gravity,final slope angle,cohesion and bulk modulus.On this basis,the cloud model theory was used to optimize the final slope angle,and it is determined that the final slope angle of the mine slope is 51°.This analysis result is consistent with the actual situation of the mine.The research results can provide a reference for the prediction and prevention of similar mine slope disasters and subsequent engineering treatment.
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