淮南矿区谢桥矿A组煤底板灰岩组分结构及水化学特征分析

A组煤(1煤)是矿井延伸开采的主要煤层,受底板承压岩溶水威胁。随着开采深度的增加,A组煤层底板灰岩突水几率也随之逐渐增大。采集谢桥矿A组煤层底板石炭系太原组石灰岩样品及对应层位的太灰水样品,并对不同层石灰岩样品进行显微镜下、X射线衍射(XRD)以及X射线荧光光谱(XRF)分析,对水样进行常规离子组分的测试分析,探讨了A组煤石灰岩矿物组成、化学组分及离子含量之间的关系。研究结果表明:太原组C2Ⅰ层和C2Ⅲ层石灰岩孔隙发育,溶蚀能力强,为含水层;C2Ⅱ层石灰岩裂隙不发育,岩溶不发育,为相对隔水层;太灰水中Ca2+、Mg2+、Na+、K+含量主要与石灰岩组成、pH值以及阳离子交换作用有关;Cl-含量与沉积水体盐度相一致。将岩石的矿物学特征与地下水化学组成同时进行研究对A组煤开采可行性分析具有重要现实意义。

Coal Group A Floor Limestone Component Structure and Hydrochemical Characteristics in Xieqiao Coalmine,Huainan Mining Area

The coal group A （coal No.1） is the main coal seam during extension mining stage, the mining will be threatened by confined karst water. Along with the mining depth deepening, probability of coal group A floor limestone water bursting will gradually increase. The Xieqiao coalmine coal group A floor Carboniferous Taiyuan Formation limestone samples and corresponding horizon Taiyuan For-mation limestone water samples were collected. And carried out different layer limestone samples microscopic, X-ray diffraction （XRD） and X-ray fluorescence （XRF） analyses, water samples routine ion component testing analysis;discussed relations between coal group A limestone mineral composition, chemical constituent and ion content. The result has shown：limestone C2I and C2III in Taiyuan For-mation have developed pores and easy to be corroded, thus are aquifers;fissures and karst not developed in limestone C 2II thus a rela-tive aquifuge;Ca2＋, Mg2＋, Na＋and K＋contents in limestone water are related to limestone composition, pH value and cation exchange;Cl-content is consistent with salinity of water during the limestone was deposited. To study the rock mineralogical characteristics and groundwater chemical constituents simultaneously has important practical significance in coal group A mining feasibility analysis.