Study on slope stability of coal pillar instability in goaf with inclined coal seam
In order to explore the influence of coal pillar instability in goaf on the slope stability under the disturbance of open-underground combined mining in Pingzhuang West open-pit mine,the evolution law of slope stress-displacement-plastic zone and the change of safety factor of coal pillar instability in different mining stages and goaf of Pingzhuang West open-pit mine were studied by the similar simulation experiment and numerical simulation method.The results show that the collapse of coal pillars in goaf significantly affects the upper-middle part of slope,leading to the formation of cracks in the stress concen-tration area.During the coal seam mining period,the topin the middle part of slope reaches the critical value of shear failure.However,with the collapse of coal pillars in goaf,the center of gravity of slope moves backward,and the shear stress decrea-ses,which inhibits the downward sliding of slopeto some extent.The collapse of coal pillars in goaf reduces the safety factor of slope,and the slope changes from stable to basic stable state,then the stability decreases,and the possibility of landslide in-creases.The research results can provide theoretical guidance for the underground mining ofopen-pit mines.
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