孙疃矿第四含水层分布特征及富水性评价

Distribution Characteristics and Evaluation of the Fourth Aquifer in Kongtong

为研究新生界第四含水层"四含"对于第一水平上覆安全煤岩柱留设类型的问题,通过钻探、岩芯取样、土工试验、X-射线衍射、电镜扫描半定量分析、抽(注)水试验等方法手段,研究了孙疃矿7211工作面松散层底部第四含水层"四含"岩性特征、矿物成分及其厚度分布和富水性特征,依据《煤矿防治水规定》及抽水试验结果,分析得出了7211工作面"四含"为"弱富水性"含水层类型,需留设防砂安全煤岩柱的结论。探明和正确评价工作面松散层底部"四含"的富水性特征,对于确定留设安全煤岩柱类型,提高煤炭资源的回采率,充分开发和利用煤炭资源具有重要的现实意义,也为矿井实现持续正常的安全生产提供可靠依据。

By drilling, core sampling, soil test, X - ray diffraction, semi - quantitative analysis with electron mi- croscope scanning, pumping - injecting test, the characteristics of lithology, mineral composition, thickness dis- tribution and watery of the fourth aquifer in loosen layer bottom in working face No. 7211 of Suntuan Coal Mine were studied. Based on ＂Regulation of Coal Mine Water Prevention and Control＂ and the pumping test results, some conclusions were obtained as the following： ＂the 4th aquifer＂ in working face No. 7211 belongs to weak wa- tery category and coal and rock pillars protecting against water are necessary. Detection and correct evaluation of water - rich features of ＂the 4th aquifer＂ in the loosen layer bottom in the working face has important practical significance in determining the type of pillars, improving recovery rate of coal resources, and developing and uti- lizing coal resources, and also provides a reliable basis for mine safety.