东庞矿奥灰含水层水文地质条件研究

Study on hydrogeological conditions of ordovician ash aquifer of Dongpang Mine

东庞矿-300 m以深的9号煤奥灰突水系数大于临界值0.1 MPa/m,煤层开采受奥灰水严重威胁。针对这一问题,对井田内奥灰含水层的地质、水文地质资料进行收集整理,综合分析和研究,总结奥灰含水层的水文地质特征规律。研究结果表明,东庞井田内奥灰含水层具有一定程度的岩溶裂隙发育,岩溶发育的层段主要集中在峰峰组七段和八段;含水层主要涌水层位在峰峰组八段,但富水性极不均一,具有明显的分区性;SO42-、Ca2+、Mg2+可作为奥灰水的判别指示离子;奥灰含水层区域注浆改造的层段可以选为含水层顶界面以下0~40 m。

Ordovician limestone water bursting coefficient of -300 m No.9 coal seam of Dongpang Mine was bigger than critical value 0.1 MPa/m,mining threatened by Ordovician limestone water,geological and hydrogeological information of Ordovician ash aquifer were collected,rules of hydrogeological characteristics were summarized.The study result showed that there was karst-cranny developing in the mine,mostly in No.7 and No.8 phase of Fengfeng Group,main aquifer in No.8 phase of Fengfeng Group,with uneven watery and obvious zoning characteristics,SO_4^（2-）,Ca^（2＋）,Mg^（2＋） as discriminant ion,the grouting reconstruction of Ordovician aquifer area could be 0 ~ 40 m below top interface of aquifer.