井筒冻结孔环形空间水害治理及效果评价  

Water Control and Effect Evaluation in Annular Space of Freezing Shaft Hole

作　　者：方沛[1] 

机构地区：[1]皖北煤电集团钱营孜煤矿,安徽宿州234000

出　　处：《煤矿安全》2015年第12期200-202,共3页Safety in Coal Mines

摘　　要：采用全深冻结法施工的井筒在冻结壁解冻后,冻结孔与冻结管外的环形空间极易成为导水通道,严重威胁矿井安全。钱营孜矿西风井采用全冻结法施工,井筒施工到井底水仓时,由于上部局部含水层解冻出水,总涌水量达到25 m^3/h,大量水"岩"的流失,造成井筒底一侧沿冻结孔向上冒落形成很大的空洞。通过调研、分析,采用"点对点割裂"注浆法,采用分段(次)、深孔注浆,有效的治理了冻结孔环形空间的水害,出水通道得到有效的封堵、围岩得到明显加固,井筒总涌水量降至0.5 m^3/h以下。If the shaft construction adopts full deep freezing method after the frozen wall thawing,the annular space between inside and outside the freezing hole easily becomes water channel,which is a serious threaten to mine safety. The west air shaft in Qianyingzi Coal Mine is constructed by full freezing method. When the shaft constructs to the well bottom sump,the upper local aquifer thaws out of the water,the total yield reaches to 25 m-3/ h. As large amounts of water rock runs off,one side of shaft bottom upwards along the freezing hole caving forms a big hole. Through the research analysis,point- to- point lacerate grouting and deep hole grouting by subsection were used,which effectively governed the annulus water in freezing hole. The water channel is also plugged obviously and the surrounding rock is reinforced,so shaft total yield dropped below 0.5 m-3/ h.

关 键 词：井筒 冻结孔 环形空间 导水通道 水害治理 

分 类 号：TD725[矿业工程—矿井通风与安全]