许疃煤矿3_220工作面含水层下开采安全性评价

Safety Evaluation of Mining under Aquifer in 3_220 Working Face of Xutuan Coal Mine

依据许疃煤矿3_220工作面地面勘探资料和井下防治水工程成果,对该工作面含水层下开采安全性进行了综合评价。研究结果表明:3_220工作面主要充水含水层是煤层顶板砂岩裂隙含水层和"四含",前者不会对工作面开采构成威胁,后者富水性弱,且可疏放,有疏干的可能性;工作面设计留设的最小煤(岩)柱高度远大于计算高度,故综合评价结果表明含水层下3_220工作面开采是安全可行的。

Based on the ground exploration data of 3220 working face and the results of underground water prevention and control project in Xutuan coal mine, comprehensively evaluates the safety of mining under the aquifer. The results show that the main water-filled aquifer in the 3220 working face is the coal seam fissure aquifer of the coal seam roof and the "four-inclusive". The former does not pose a threat to the mining of the working face. The latter is weak in water and can be drained or even completely drained.The minimum coal(rock) column height of the working face design is much larger than the calculated height, so the comprehensive evaluation results show that the mining of the 3220 working face under the aquifer is safe and feasible.