Stability Evaluation of the Roof of Mountain No.4 Coal in Dongzhouyao Mine Field
Due to experinecing complex tectonic action and sedimentary action,there are significant differences in the stability of the roof in different main mining coal seams or different parts of the same main mining coal seam.In order to avoid safety accidents such as roof caving,collapse and others happen during the production process of the mine,the Mountain No.4 main mining coal seam in Dongzhouyao Mine Field is taken as the research object.Starting from the perspective of the natural causes of the roof,the sedimentary conditions,structural characteristics,rock mechanical properties and other factors that affect the stability of the coal seam roof are analyzed.Nine evaluation indicators,including the combination of roof lithology,dominant lithology,sand content,direct roof thickness,roof structure,degree of fracture development,degree of plane deformation,compressive strength and tensile strength are determined.A hierarchical evaluation model is established,and the fuzzy mathematics comprehensive discrimination method is applied to comprehensively evaluate the stability of the roof,the distribution range of highly stable area,stable area,and moderately stable area in the roof of Mountain 4 coal is obtained.The evaluation results provide a theoretical basis for coal mine roof management,roof hidden danger governance,and efficient mining.
coal seam roofcomprehensive evaluation of stabilityinfluence factorfuzzy mathematical discriminant method
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