Research On Stahility The Deformation Zone Of The South Slope In Zahanaoer Open-pit Mine

With the increase of open-pit mine production,the problem of open-pit slope stability is more and more prominent.Analyzing the stability of the slope and designing of the end to the shape of side slope are important preconditions for the safe and efficient mining of the overlying strata.This paper takes the deformation zone of south slope in Zahanaoer opencast mine as the engineering background.The stability of the slope of the deformation zone in the south was studied by using field investigation,theoretical analysis and numerical simulation.The three-dimensional space effect was discussed by using numerical simulation.Based on the three-dimensional space effect which cross exploitation and inner dumping has brought to unstable slope,the method of two dimension combined with three dimension was used,and every level of the slope was optimized to bounded parameters.Apart from that,the rationality of the optimized slope was verified by simulating the three-dimensional slope stability and the spatial deformation failure mechanismThe research shows that the consequent weak layer is the main factor which influence deformation and stability of the slope.The stress concentration of the foot of the slope resulted by the double effects of gravity of rock mass and the poisson effect is the important factor causing cross mining IVC coal seam in the south side of weak layer failure.The three dimensional stability of the south slope by cross mining decreases with the increase of the tracking distance,and the tracking distance between the cross section and the inner dumping should be controlled within 100m.The slope angle of the BK2 and BK4 sections are 24 and 23 respectively after the horizontal optimization,and the slope angle of the deep slope are up to 41 and 42 degrees respectively.