倾斜煤层上顺槽沿空留巷顶板抽冒机理研究

Research on Mechanism of Roof Caving in Gob-Side Entry Retaining in Upper Roadway within Inclined Coal Seam

为了研究倾斜煤层上顺槽沿空留巷顶板的抽冒机理,本文结合长城三矿的生产地质条件,采用理论分析,研究了充填体上方直接顶极限平衡区的宽度,进而确定了煤层倾角是影响倾斜煤层上顺槽沿空留巷充填体上方直接顶稳定性的重要因素。再通过UDEC数值模拟软件,研究了充填体上方直接顶的变形、切向位移量、损伤程度、离层量等参数与煤层倾角的关联,为倾斜煤层中沿空留巷的应用及安全生产提供了理论基础。结果表明:直接顶变形量、切向位移量、损伤程度和离层量会随着煤层倾角的变大而变大,且顶板切向位移量和离层量的分布情况也会随之变化。

In order to study the mechanism of roof caving in gob-side entry retaining in upper roadway within inclined coal seam, combined with the production geological conditions of Changcheng No.3 Mine, the width of limit equilibrium area of direct roof above backfill is studied by theoretical analysis, and then it is determined that the dip angle of coal seam is the main factor affecting the stability of direct roof above backfill of gob side entry retaining in coal seam. Then, through UDEC numerical simulation software, the relationship between deformation, tangential displacement, damage de-gree, layer separation of the direct roof above backfill and coal seam dip angle is studied, which provides a theoretical basis for the application of gob-side entry retaining in inclined coal seam. Result shows that the deformation, tangential displacement, damage degree and separation amount of direct roof will rise with the increase of coal seam dip angle, and the distribution of tangential displacement and separation amount of direct roof will also change.