Research On Stability Of First Mining Area Eastern Slope In Huolinhe North Open-Pit Mine

The safe and effective recovery of the overlying pressure under the open pit slope can significantly improve the economic benefits of the open pit mine.The slope of the eastern in the Huolinhe North open-pit mine that is a typical soft rock slope.Eastern side slope has been in intermittent creep state all the time under 21 coal seam soft bedding and the gravity load of the inner dump.Restrict the 21 coal safety toe pressure drawdown.Therefore,it is very important to determine the reasonable depth and the spatial shape of the slope in order to improve the stability of the slopeThis paper discussed the research aiming at the problem of slope stability of coal mining pressure Huolinhe North open-pit mine.Based on the theory of slope engineering geological survey and influencing factors of slope stability and potential landslide mode prediction by using rigid body limit equilibrium and numerical simulation method to combine,respectively to two kinds of vertical mining and cross mining development way down deep influence on slope stability are analyzed.Then the slope stability with the excavation location and tracking the change of distance and slope stability with the excavation location and tracking the change of distance,thus the slope shape optimization was designed.Research shows that the potential landslide pattern of northeast slope along the 21 coal seam dip weak layer from an ellipsoidal bedding side interface cut layer sliding,dip weak layer are the main controlling factors of slope stability;the vertical mining way drawdown cannot effectively realize pressure coal mining;using cross mining mode deep down,double support mining and help in the dump by cross is the best way to coal mining;in cross mining conditions,reduce the tracking distance has important significance to control the stability of slope,the slope stability coefficient with the increase of the length of track distance negative exponential decrease;slope can meet the safety requirements the Northeast cross mining location for help setting up rock column 50m,excavation angle of 70°,tracing distance not exceeding 100m.