Evaluation And Stability Of Rock Mass Quality Of Slope Slope In

Currently, more and more people attach importance to the mining industry with the rapid development of the world economy, but the instability and collapse phenomenon of the mine stope slope is very common in the mining industry, threating to the security of State property and people’s lives seriously. So instability and prevention of mine stope slope is still huge problems to be solved. This article according to above problems, evaluate the quality and stability of rock about stope slopes of marble mine in Yunnan Yingjiang County, optimal design stope slope and provide the basis for the exploitation of marble.Study area is located Gaoligong group metamorphic belt, where the marble has good quality and high Semi-finished product rate. The author researched the study area through collectting data, field surveys, sampling, testing and numerical simulation work. The main contents are:(1)Basic identified stratigraphy, tectonics, igneous rocks, groundwater types, aquifer(impermeable layer) characteristics, groundwater recharge, runoff and discharge conditions, engineering geological rock group, structural surface characteristics and environmental geology in the study area and obtained various engineering physical and mechanical parameters of the rock group through collectting geological data related to the study area and hydrogeological investigations, engineering geological mapping, drilling and catalog all types of rock and soil sampling, testing, etc.(2)The rock geomechanics RMR classification is used for appraising rock quality in each study area, evaluation results:RMR total score of argillite (upper plate rock) is51, the quality level is Ⅲ and the rock belongs to a quality general rock; marble (ore) of RMR total score of68.2, quality grade Ⅱ, are of good quality rock; sandy slate (footwall rock) of RMR total score of70.6, quality grade to Ⅱ, belongs to good quality rock. It can be seen in the mining process in Dali rock, argillite formation excavation slope stability greatly influenced by the rock quality, engineering layout direction, surface water and other factors.(3)Reference mining and exploitation program similar to the study area, the slope stope is designed, on the basis of the evaluation results based on rock quality and use CSMR highwall mining stope method for the stability after grading, classification showed that Sandy slate slope stability belongs to II grade level.The slope is stable, but may occur locally off the block,and corresponding reinforcement method is point-like reinforcement.Argillite Slope stability belongs to III grade level. Then local slope is stable, the destruction of small-scale flat or wedge may occur, and the system reinforcement method should be used to reinforce the slope. The results show: sandy slate is better stability after highwall mining; argillite locally stable slope, to improve its stability, it should be appropriate mitigation final slope angle.(4)Based on the principles of finite element strength reduction and stope ANSYS software to simulate the slope setting, combined with slope instability criterion to analyze its stability, slope stability factor is obtained. Simulation shows that:the study area after stope slope excavation, slope stability argillite coefficient of1.17, in the limit equilibrium state, sandy slate slope stability factor of1.28, is in a stable condition.(5)The author comparatived the results of the numerical simulation and Slope stability CSMR grading method, the results of two methods are basically same, that sandy slate slope is more stable than the argillite one. Sandy slate slope is in a steady state and the argillite slope is in the limit equilibrium state.argillite slope angle of slope needs to be optimized, structural parameters slope optimized for:step height and width remain unchanged platform, stairs slope angle is reduced to65°, the final slope angle is reduced to49°, and numerical simulation shows that optimized argillite slope stability factor is1.25, which belongs to stable state.Research methods and conclusions can be generalized to study a similar slope mines, has a certain reference value.