Maiduoshan Coal Mine, Shenhua Ningxia Coal Industry Co., Ltd.

针对封闭不良地质勘探钻孔探测困难的问题,采用物探、钻探综合方法对圈定封闭不良勘探钻孔进行样查,由于封闭不良勘探钻孔可以连通煤层顶、底板含水层,其周边区域视电阻率较低,利用瞬变电磁法圈定了掘进巷道前方的低阻异常区,进而对异常区范围内施工钻孔进行验证,探查封闭不良勘探钻孔情况,对比麦垛山煤矿130604工作面巷道掘进实际揭露资料,与探查结果一致。结果表明:采用物探方法可以显著缩小异常区的范围,对异常区施工扇形探放钻孔,这样可以进一步确定是否存在封闭不良勘探钻孔,这2种方法相综合,可以有效避免巷道掘进过程中发生封闭不良勘探钻孔水害事故。

Based on the difficulty of detecting the geological borehole sealing's quality surrounding tunnel, the authors studied how to circle the low resistivity anom aly area combined with geophysical prospecting and drilling method.Due to the poor sealing borehole could connect the roof and floor aquifer, the apparent resistivity of area surrounding the poor sealing borehole was low.Transient electromagnetic method was used to circle the low resistivity anomaly area in front of tunnel, and this ano maly area was verified by drilling borehole to detect the poor sealing borehole . According to the actual information of No.130604 working face when driving in Maiduosh an Mine, the theoretical results were consistent with the actual situation.The result showed that, the range of anomaly area could be reduced by geophysical prospectin g significantly, drilling fan-shaped borehole for the anomaly area could determine whether there was a poor sealing borehole further.Based on the two methods, the wat er disaster of poor sealing borehole could be avoided effectively during drivage.