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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。
After the wellbore constructed by full deep freezing method is thawed on the frozen wall, the annular space outside the frozen hole and the frozen pipe can easily become a water conduit, which is a serious threat to mine safety. When the wellbore construction reaches the bottom hole water storage tank, the total water inflow will reach 25 m ~ 3 / h due to the thawing of the top local aquifer, resulting in the loss of large amount of water and “rock” As a result, a large hole is formed on the bottom side of the wellbore, which runs up along the freezing hole. Through the research and analysis, the “point-to-point fracturing” grouting method is adopted, the sub-step and deep-hole grouting are adopted to effectively manage the water damage in the annular space of the freezing hole, the water outlet channel is effectively blocked and the surrounding rock is obtained Significant reinforcement, the total wellbore water inflow dropped below 0.5 m ~ 3 / h.