深部大倾角煤层综放开采覆岩运动及应力分布规律

Study On overburden movement and stress distribution law of fully mechanized caving mining in deep coal seam with large inclination angle

研究深部大倾角煤层综放开采覆岩结构及应力场分布演化规律,对于正确认识大倾角煤层综放采场矿压特征、保证工作面安全高效生产具有重要意义。以阳城煤矿3301工作面为工程背景,在分析大倾角工作面覆岩移动破坏演化规律的基础上,建立了深部倾角煤层综放开采三维数值计算模型,研究了煤层倾角对采场顶板应力分布的影响规律。结果表明,大倾角煤层综放采场顶板垮落沿工作面倾向方向呈现出非对称性,工作面中、上部顶板岩层运动较下部剧烈;且煤层倾角越大,顶底板围岩受剪破坏的可能性越大。

The evolution of the overburden structure and stress field distribution of integrated release mining of deep coal seams at large dip angles was studied,which is of great significance to the correct understanding of the mining pressure characteristics of integrated release mining of coal seams with large dip angles and ensuring the safe and efficient mining.On the basis of the analysis of the evolution law of the overburden damage movement and destruction of the large dip angle face,a three-dimensional numerical calculation model of the deep dip angle coal seam integrated release mining was established,and the influence of the dip angle of the coal seam on the stress distribution of the roof of the mining field was studied.The results showed that the collapse of the top plate of the integrated release of coal seam with large dip angle,going with asymmetry along the tendency direction of the working face,and the movement of the top plate in the middle and upper part of the working face was more severe than that in the lower part;and the larger the dip angle of the coal seam,the greater the possibility of shear damage to the surrounding rocks of the top and bottom plate.