Slope stability of an alpine and high altitude mine based on limit equilibrium method and strength reduction method
In order to verify whether the stability of the designed slope of an open-pit mine in the western alpine and high-altitude area meets the requirements of the current specification,and to analyze the change rule of the displacement caused by open-pit mining,a representative typical profile is selected with reference to the end-of-area plan of the mine,and the geotechnical parameters of the rock and soil body of the slope of the mine are comprehensively determined by combining with the actual situation of the mine area,engineering geological condi-tions,and indoor physical-mechanical tests using the H-B criterion and so on.The stability of the designed slopes was verified by using the unbalanced thrust method and M-P method in the limit equilibrium method and the finite-difference strength discount method,with the safety coefficient as the index.The reliability of the strength discount method in calculating the potential sliding surface morphology and the safety coefficient is verified through the comparison of the calculation results of limit equilibrium and strength discount.On this basis,the displacement pattern of mine slopes under rock excavation,blasting and seismic loads before strength reduction is analyzed.The results of the study can provide a reference for quantitative analysis of slope stability in the design of open pit mines.
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