Study On The Stability Of Slope Influenced In Wu Jiata Open-pit Mines By The Underground Vacant Area

The open-pit mine of Wu Jiata is the Shendong Tianlong Group companies belongs to the large opencast coal mine, its coal seam distribution is relatively shallow,the coal seam outcrop has directly exposed at the surface or riverbed, in such a coal seam distribution conditions,it created favorable conditions for local small coal mines mining, the2-1#and2-2#coal seam large area mining in the mining realm,distributed more different standardized mined-out areas in the realm of open-pit mining. Thus the opencast workings stairs or under the slope appears mined-out area in open-pit mining and underground mining at the junction,it will lead to Open-pit slope rock mass sinking,movement and deformation,decreased stability and other issues,it bring a great harm to the open-pit mining, and creating a safety hazard for open-pit mine in the production.Papers for the actual conditions of the Wujiata open-pit mine, through the selected typical cross section, to establish the slope calculation model of first mining district, use the rigid limit equilibrium method and FEM strength reduction to meticulous research the slope deformation,destroy rule and stability under the mined-out area impact conditions of the2-1#2-2#coal seams, derive slope safety factor and failure mode in different mined-out area level distribution location and mined-out area span value. Under the influence of slope formed sliding failure along the2-2#seam floor;Under the influence of the mined-out area of different distance the mined-out area and slope surface, The diferent mined-out area span value formed mined-out area roof slump destruction, Sliding failure along the mined-out area and the slope of the composite to destroy several major failure mode,the safety factor of the slope change. In this thesis, the research of the open-pit slope distortion destroy rule under the influence of underground vacant area also has a certain guiding significance.