地面防治水钻探技术在双系煤层上覆采空区积水治理中的应用

Application of Surface Drilling Process to Treatment of Accumulated Water in Goaf Areas Overlying Binary Coal Seam

针对双系煤层上覆采空区积水对下部煤层开采构成的威胁,提出在地面布置钻孔,穿越上部多层采空区,施工探放水孔与大直径抽水井的防治水钻探技术。采用该技术在大同矿区上覆侏罗系采空区的积水治理实践表明,地面探放水孔能够实现采空积水区与下部石炭系开采煤层巷道的贯通式放水,大直径抽水井可实现超大流量的采空区积水抽放,施工的9个地面探放水累计疏放采空区积水398.1万m3,5个大直径抽水井累计抽排采空区积水200余万立方米,取得了较好的贯通式放水和抽排效果。介绍了地面探放水孔与大直径抽水井钻探技术在同煤集团同忻矿上覆侏罗系采空区积水治理中的应用,可为其它类似开采条件的矿井上覆采空区积水治理提供参考。

In view of the dangers of accumulated water in the upper goafs to mining of the lower coal seam in the binary coal seam,it was proposed to drill exploration and drainage holes,plus large diameter pumping wells from surface through the upper multiple goaf areas for water discharge.The application of the process to treat the accumulated water in the Jurassic goaf in the Datong mining area indicated that the exploration and drainage hole can effectively drain water from the goaf to the lower Carboniferous coal seam roadway;while the large diameter pumping well can achieve discharge of the goaf at large flows.A total of 3.981 million m 3 of accumulated water in the goaf was drained by the 9 exploration and drainage wells,and more than 2 million cubic meters of accumulated water in the goaf discharged by the 5 large-diameter pumping wells,achieving good drainage results.This paper introduces the application of the exploration and drain well,and large-diameter pumping well drilling processes to the water control of the Jurassic goaf in the Tongmei Group Tongxin Mine,providing reference for the goaf water drainage in the similar mining condition.