The Stability Evaluation Model Of Open Pit Mine Slope Based On Game-variable Weight Extension Cloud Theory

The slope of open-pit mine is prone to instability and many accidents occur,and the degree of accident damage is usually serious.Therefore,it is particularly important to evaluate the stability of open-pit slope scientifically and effectively.However,there are various uncertainties in the open-pit mine slope stability evaluation system.The traditional evaluation model cannot solve the uncertainty problem in the evaluation system,and different evaluation theories focus on different characteristics,and a single evaluation method is difficult to meet all the characteristics of the evaluation system.In view of this,this paper establishes a dynamic coupling evaluation model of slope stability of open-pit mine based on game-variable weight extension cloud theory on the basis of digging and screening factors affecting slope stability of open-pit mine.It mainly focuses on five aspects: the establishment of evaluation index system,the determination of index weight,the construction of evaluation model,the comparison and inspection of various evaluation models and the application of evaluation models in engineering examples.The main research results are as follows:(1)This paper takes the stope slope of Jiepailing Open-pit Mine as the application object of model engineering example,comprehensively applies the theoretical analysis,expert consultation,frequency analysis and maximum uncorrelated analysis.The influencing factors of slope stability in open-pit mine were excavated,screened and tested,finally 5 first-class indexes such as rock quality index and slope geometric conditions and19 second-class indexes such as rock mass structure characteristics,bulk density and final slope angle were selected to construct a comprehensive evaluation index system.(2)In order to improve the accuracy of subjective constant weight,the improved FAHP method is used to calculate subjective constant weight,and the fuzzy judgment matrix is constructed by experts using ternary judgment scoring method,which is more in line with people's thinking characteristics Considering the contrast intensity and conflict between indexes,CRITIC method is used to calculate objective constant weights.To give consideration to subjective and objective factors and avoid the imbalance of constant weights,the game theory model is used to determine the optimal comprehensive constant weights.To fully consider the influence of the state value of the evaluation index on its weight and avoid the defect that the weight of the same index of different slopes remains unchanged forever,the variable weight theory is introduced to dynamically modify the comprehensive constant weight according to the state value of the index itself,and obtain the dynamic optimal comprehensive weight.(3)Aiming at the problem of incomplete evaluation occurring in a single evaluation method,an extension cloud comprehensive evaluation model coupled with cloud model and matter-element extension model is constructed on the basis of dynamic optimal comprehensive weight,which organically combines the two to achieve complementary advantages.Make full use of the advantages of the two models in dealing with fuzzy problems thus increase the accuracy of evaluation results.(4)A variety of evaluation models are used to evaluate the stability of the bench sections of three open-pit mine slopes.The comparative analysis shows that the evaluation model constructed in this paper has high accuracy,and its evaluation results are consistent with the actual situation,and the specific situation of the stability grade of the slope step section can be intuitively seen from the grade concept nephogram,which is obviously superior to other models,thus proving that the evaluation model constructed in this paper is not only scientific and reliable,but also has high accuracy.(5)Finally,the evaluation index system and evaluation model are applied to the slope stability evaluation of Jiepailing open-pit mine,and the evaluation results are consistent with the actual situation of the slope.The Geostudio software is used for simulation verification,and the results further prove the reliability of the comprehensive evaluation model constructed in this paper.