矿井井壁淋水治理技术实践
2019-05-13仇美玲冯国栋
仇美玲 冯国栋

【摘 要】济宁二号煤矿主井于1989年11月24日~1991年4月30日施工建设,运行30年来井壁出水导致井筒设备锈蚀严重,维护工作量增大,工作环境恶劣,同时存在井筒出水涌沙、垮塌的风险。济宁二号煤矿采取壁后注浆治理后,原明水点及新生的出水点被有效封堵,消除了井壁出水涌沙的隐患,改善了井筒内工作环境,保障了主井井筒的安全运行。
【关键词】井壁;淋水;涌沙;垮塌;注浆;治理
中图分类号: TD745 文献标识码: A 文章编号: 2095-2457(2019)08-0171-003
DOI:10.19694/j.cnki.issn2095-2457.2019.08.074
【Abstract】The main shaft of Jining No.2 Coal Mine was constructed from November 24,1989 to April 30,1991. After 30years of operation,wellbore equipment was seriously corroded,maintenance workload increased,and working environment was harsh.At the same time,there were risks of wellbore water gushing sand and collapse.After the wall post-grouting treatment was adopted in Jining No.2 Coal Mine,the original open water point and the new water outlet point were effectively blocked,eliminating the hidden danger of water and sand gushing from the well wall,improving the working environment in the well bore and ensuring the safe operation of the main well bore.
【Key words】Wall of a well;Water drenching;Sand gushing;Collapse;Grouting;Governance
1 概况
1.1 井筒结构
济宁二号煤矿主井井筒净径φ6.0m,井口设计标高+38.00m,井深666.25m。松散层厚度181.30m,冻结深度258m。冻结段井壁为普通双层钢筋混凝土井壁,内、外层厚度分别为400mm、350mm;基岩段采用钻爆法施工,井壁为单层素混凝土井壁,厚度400mm。冻结段外层钢筋混凝土井壁表面铺设25-50mm厚的泡沫塑料板。井筒内布置一对提升箕斗,提升方位270°。安装球扁钢组合罐道,工字钢罐道梁,罐道梁采用支座固定,井筒内铺设通信、信号电缆。
1.2 井壁出水区段
根据现场观察,主井在松散层段主要存在4个显见的出水点,分布于井深45-53m段,出水点均位于罐道梁梁座附近,四个出水点总涌水量约为6.3m3/h。
针对主井井深52.9m西南、西北侧两个水量较大的水点,2013年曾尝试用螺丝刀将棉纱与锚固剂的混合物填入罐道梁梁座与井壁的缝隙,待锚固剂凝固后,采用木楔打进出水口以期起到封堵出水的目的,由于水量及水压较大,封堵效果不理想。
1.3 出水区段地层情况
井筒主要地层从上到下依次为第四系、侏罗系、二叠系和石炭系。……
