群孔抽水试验与同位素分析在煤矿水文地质勘查中的应用

Application of Group Boreholes Pumping Test and Isotopic Analysis in Coalmine Hydrogeological Exploration

田庄煤矿主采煤层为石炭系太原组16上及17煤层,威胁煤层开采的地下水水源主要为十下灰、十三、十四灰和奥灰含水层。其中十三、十四灰含水层水力联系密切,可按同一含水层看待。十下灰岩水为16上煤的直接充水水源,十三、十四灰灰岩水和奥灰灰岩水为16上及17煤层的底板间接充水水源,在构造地段有可能转化为直接充水水源。在研究煤矿群孔放水试验的基础上,全面分析了氢氧同位素资料,结果表明井田内十下灰和奥灰含水层有各自的补、径、排系统,正常情况下水力联系较弱;十三、十四灰含水层与十下灰和奥灰含水层均发生着水力联系,在采掘及导水断层的影响下,其含水层间地下水联系变得更加密切。两种研究的结论基本一致,增加了成果的科学性和可信性。

Coal seams Nos. 16U and 17 in Carboniferous Taiyuan Formation are main mineable coal seams in the Tianzhuang coalmine. The mining of above coal seams is threatened by Carboniferous limestone aquifers 10L, 13, 14 and Ordovician limestone aquit^r. In which aquifers 13 and 14 have close hydraulic connection, can be regarded as one aquifer. Aquifer 10L is direct water filling source of coal seam No. 16U, while aquifers 13, 14 and Ordovician limestone are indirect water filling source of coal seams Nos. 16U and 17, but call be direct water filling source because of faults. Based on coahnine group boreholes dewatering test, ronndly analyzed hydrogen and oxygen isotopic data, the result has shown that aquiters 10L and Ordovician limestone have their own recharge, runoff and discharge sys- tem, hydraulic connection is rather weak under normal conditiom aquifers 13, 14 and aquifers 10L and Ordovician limestone all have hy- draulic connections, under the impacts from winning, opening and water conducted fault, connection between them will be more closely. Conclusions of two researches are basically agreed, thus increased scientificity and dependability of results.