Analysis and Suggestion on Slope Stability of Xinxin Opencut Coal Mine
In order to adapt to the policy of eliminating outdated production capacity and promoting the optimization and upgrading of the coal industry in Inner Mongolia Autonomous Region,and to ensure the safety production of coal mines,the original Xinxin Coal Mine changes its original underground mining to opencut mining by expanding its production scale and improving the recovery rate of resource reserves.Based on the geological characteristics of the well field,taking the slopes of the mining site and the waste dump inside the mine as the research object,a slope landslide model is constructed.Through theoretical analysis and calculation,the landslide mode of Xinxin opencut coal mine is determined to be a slope sliding form of"tensile crack--circular arc type landslide";The stability coefficient of the slope with a maximum depth of 75 m inside the well field is 1.312,which meets the requirements of the safety reserve coefficient;The slope angle is 18°,and the stability coefficients for the dumping height of 60 m and 80 m in the waste dump are 1.342 and 1.308,respectively;Coal seams belong to weak layers in rock strata.In opencut coal mine production,mining,slope,groundwater drainage,ground surface waterproofing and drainage,surface displacement monitoring,and underground displacement monitoring should be included in dynamic engineering geological exploration for implementing dynamic evaluation,so as to constantly grasp the slope situation.
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