不同采高和关键层对导水裂隙带发育的影响

Influence of Different Mining Height and Key Stratum on Development of Water Flowing Fracture Zone

基于补连塔煤矿12407工作面煤层赋存特征,运用UDEC数值模拟软件建立不同采高的二维地质模型,结合关键层分析了不同采高下导水裂隙带的发育规律。结果表明,关键层对导水裂隙带的发育规律有较大的影响;导水裂隙带的发育高度与采高呈正相关关系;补连塔矿区平均导采比为18.7,说明补连塔矿区导水裂隙带发育较高。通过对补连塔矿区导水裂隙带发育规律的研究,可以预测不同采高对采空区上覆岩层的损伤程度,并提前采取措施,可防止工作面溃沙、透水和保护地表植被。

Based on the occurrence characteristics of coal seam at Bulianta Coal Mine 12407 working face,the 2D geological model for different mining height was established by using UDEC software,and we analyzed the development laws of water flowing fracture zone through key stratum. The results show that key stratum has a larger effect on the development law of water flowing fracture zone; the development height of water flowing fracture zone and mining height are positive correlation; the average ratio of height of water flowing fracture zone and mining height is 18. 7,which explains the development of higher water flowing fracture zone. The research on development law of water flowing fracture zone in Bulianta Mining Area can forecast damage degree of the overlying rock in different mining height in the mined- out area,and we can take measures to prevent sand inrush and water inrush at working face and protect plants on the surface.