近距离上层老空区水害危险性评价方法——以巩留县塔拉迪煤矿为例

Water Hazard Assessment in the Close Distance Old Goaf

老空水害是新疆地区煤矿防治水的重点和难点,对于煤矿安全生产造成严重威胁。为摸清伊犁巩留县塔拉迪煤矿C8煤层老空水害问题,在矿井水文地质条件研究基础上,对老空区积水充水水源及充水通道进行分析,结合瞬变电磁和钻探成果,对C8煤层老空区进行积水量预测和水害评价。研究表明,C8煤层老空区充水水源主要为西山窑组砂岩孔裂隙含水层,充水通道主要为采动破坏后的导水裂缝带;瞬变电磁物探富水异常区富水性弱,两个富水异常区积水量预测为3188.12 m^(3)和7609.85 m^(3),二采区老空区涌水量为96.45 m^(3)/d;据划分标准,二采区仅在8-2富水异常区采空区范围内为高危险区,可采取主动探放方法进行疏排,保障下部C7煤层的安全开采。

Goaf water disasters is the key and difficult point for prevention and control of coal mine water in Xinjiang region,which poses a serious threat to coal mine safety production.The purpose of this article is to find out the problem of goaf water damage in C8 coal seam of Taradi Coal mine in Yili Gongliu County.On the basis of the study of mine hydrogeological conditions,the water source and water filling channel in goaf area are analyzed.Combined with transient electromagnetic and drilling results,the water volume prediction and water damage evaluation in goaf area of C8 coal seam are carried out.The results show that the main source of water filling in the goaf area of C8 coal seam is the sandstone pore fissure aquifer of the Xishanyao Formation,and the main water filling channel is the water-conducting fracture zone.The water-rich anomaly area of transient electromagnetic geophysical exploration shows weak water abundance,and the water volume of the two anomaly areas is predicted to be 3188.12 m^(3) and 7609.85 m^(3).The water inflow in the goaf area of the second mining area is 96.45m^(3)/d.According to the classification criteria,only within the goaf area of the 8-2 rich water anomaly area is a high risk area.The method of water exploration and discharge can be adopted to ensure the safe mining of the lower C7 coal seam.