大同煤田北区寒武-奥陶系岩溶水水文地质条件现状分析

Analysis of the Cambrian-Ordovician Karst water hydrogeological conditions in the northern area of Datong Coalfield

大同煤田北区上部侏罗系煤层资源已近枯竭,多数矿井已转入石炭系煤层的开采,随着采深的增大,煤层底板寒武-奥陶系岩溶水对煤层的威胁日益突出。虽然本区石炭系上部煤层带压较小,且与奥陶系地层间距较大(约80~100 m),但受构造影响,已发生过开采5(3-5)号煤层导通岩溶水的涌水事件,岩溶水已逐渐成为开采石炭系煤层重要的充水水源。近年来,本区岩溶水水位变化较大,又缺乏区域层面系统的水文地质工作,因此通过全面收集区域内水文地质资料,进行岩溶水水文地质现状分析,对石炭系矿井开展底板岩溶水防治工作具有重要意义。

The upper Jurassic coal seam resources in the northern part of the Datong Coalfield were nearly exhausted,in recent years,most of the mines was diverted into the exploitation of carboniferous coal seams,with the increase of mining depth,the threat of cambrian-ordovician Karst water to coal seam was increasingly prominent.Although the upper carboniferous coal seam in this area with low belt pressure and a large interval(about 80~100 m)between it and the Ordovician strata,the water gushing event of Mining No.5(3-5)coal seam to conduct Karst water occurred due to the influence of structure Karst water gradually became an important water-filling source for the exploitation of carboniferous coal seams.The Karst water level in this area changed greatly,and there was a lack of systematic hydrogeological work at the regional level.It was of great significance to the prevention and control of floor Karst water in carboniferous mines.