福建省仙亭煤矿岩溶含水层突水机理分析

Karst Aquifer Water Bursting Mechanism Analyses in Xianting Coalmine, Fujian Province

1990年8月至1991年4月,仙亭煤矿在掘进+500 m后洋运输大巷时发生突水事件,最大突水量达423.7 m3/h,以后稳定在230 m3/h。矿井于1991年10月构筑永久性挡水墙进行堵水,把灰岩水突水危险区列为禁采区,关闭煤炭资源量(332+333)1 384.1万t。为探究突水的水害问题,根据煤矿开采历史状况,综合采用硐探、探水钻探、放水试验、重新封孔、帷幕注浆等手段,对突水通道、充水水源进行探测。研究结果发现,滑脱断层F突为突水通道,它切割煤系后连通F灰断层,与下部的岩溶水发生水力联系,突水水源为栖霞灰岩岩溶水。研究成果为盘活煤炭资源,进行矿井水害预防和治理提供了依据。

The water bursting happened in the Xianting coalmine during the heading of ＋500m Houyang main haulage roadway from August 1990 to April 1991 had maximum water inflow 423.7 m3/h, and stabilized at 230 m3/h. A permanent bulkhead had been built to block up water during October 1991; the limestone water bursting hazardous area has designated as the mining forbidden region, thus sealed off 13.84 million tons of coal resources（332＋333）. To probe into the water bursting hazard issue, on the basis of coalmine historic conditions, integratedly used measures of exploratory adit, water detecting drilling, dewatering test, borehole resealing and curtain grouting to carry out water bursting channel, water filling source detections. The results have found that the detachment fault F is the water bursting channel, after intersected the coal measures then connected underlying limestone, thus hydraulically connected karst water; water bursting source is from the Qixia limestone karst water. The study has provided reference for coal resources revitalization and mine water hazard prevention and control.