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综放开采技术是厚煤层开采工艺的重要发展方向之一,采用三维有限元离散方法,研究了不同采高、不同采深、不同煤体硬度条件下煤壁片帮规律,得到了不同条件下规律拟合公式.结果表明:采高、采深、煤体硬度都影响煤体片帮;随着采深和煤体硬度增加,煤层片帮几率和片帮区范围加大;煤体硬度、采深对煤壁片帮范围影响较小;随着采高增大,煤壁支承压力峰值降低,深入煤体深度增加;煤壁片帮与采深、采高和煤体硬度呈非线性关系.该结果为进一步定量研究大采高条件下煤壁片帮影响因素提供了理论依据.
The fully mechanized top coal caving mining technology is one of the important development directions of the thick coal seam mining technology. The three-dimensional finite element discretization method is used to study the coal sheet caving rule under different mining heights, different mining depths and different coal body hardness conditions, and under different conditions The results show that mining height, mining depth and coal hardness all affect coal slab. With the increase of coal mining depth and coal hardness, the probability of coal seam slab and the area of slab area increase. The hardness, Mining depth has little effect on the range of coal wall slab. With the increase of mining height, the peak pressure of bearing wall of coal wall decreases and the depth of coal body increases. The coal wall slab and mining depth, mining height and coal hardness show a nonlinear relationship The results provide a theoretical basis for further quantitative study of the influencing factors of coal wall slab in high mining height condition.