In order to resolve the problem of unreasonable slope shape in the original design of the southern slope of open-pit coal mine in Block Ⅱ of Tar Coalfield in Pakistan,a combination of two-dimensional and three-dimensional stability analysis methods was used to analyze the slope stability.Based on the simplified Bishop method and the way of residual thrust,as well as numerical simulation analysis methods,the spatial shape of the southern slope of the open-pit coal mine in Block Ⅱ of Tar Coalfield in Pakistan was optimized,the optimal spatial form of the boundary slope has been determined.The research results indicate that the tracking distance of the horizontal mining inner row in the south slope of the open-pit coal mine in Block II of Tar Coalfield should be controlled within 100 m.Compared to the primary design,the optimized slope spatial shape shows an overall increase of 2 ° in slope angle and an increase of 8.858×106 t in coal resources extracted,stripping ratio is 0.5,which is conducive to achieving the maximum extraction of coal resources.
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