Study On Slope Stability Of Coal Broken And Rock Broken Section In South Slope Of Zhahanaoer Open-Pit Coal Mine

With the increasing expansion of the production scale of open-pit coal mine,the slope stability problem of open-pit coal mine is more serious,especially the problem of bedding soft rock landslide,which poses a great threat to the slope stability and safety production of open-pit mine.How to scientifically evaluate the slope stability of soft rock open-pit mines in combination with specific conditions,put forward a reasonable slope shape design scheme and a technically feasible slope stability control scheme,so that open-pit mines can achieve efficient,stable and safe production in open-pit mines,is the key to crack the treatment of soft rock landslides in open-pit mines.Based on the engineering background of the coal and rock breaking section in the south side of Zhahanaoer Open-pit Coal Mine,this paper summarizes the previous engineering geological data and engineering geological supplementary drilling,determines the location and shape of the weak layer,analyzes the influencing factors of stability,and determines the potential slip mode of the slope.The rigid body limit equilibrium method is used to optimize the shape design of the coal and rock broken sections and the south slope to the west of Zhahanaoer Open-pit Coal Mine.The numerical simulation method is used to analyze the three-dimensional stability of the slope of the deep composite step under different tracking distance conditions,so as to obtain the parameters of the optimal spatial form of the slope.The results show that the occurrence position of weak layer is 3B coal floor,4B coal floor and 4C coal floor.The landslide mode of the slope in the coal and rock broken section of the southern slope is that the local slope above the Quaternary floor is circular sliding,and the whole slope or the lower local slope is the cutting-bedding sliding with the weak layer as the bottom interface.The time relationship between the relocation of crushing station and the internal drainage pressure side directly affects the optimization results of the south slope morphology of the coal and rock broken section.The speed of the relocation of crushing station is the key to the optimization of the south slope morphology west of the coal and rock broken section.When the tracking distance between the horizontal mining working side and the inner dump is controlled within 50 m,the deep section shape of each area can be designed according to the combination form of 30 m transportation flat and 5 m security flat.The overall slope angles of Section 4,5 and 6 are 11.6 °,13.7 ° and 14.2 ° respectively,and the overall slope angles of Section 2 are 14.5 °,15.4 ° and 16.7 ° respectively.The paper has 49 figures,17 tables and 51 references.