Freezing Hole Annular Space Governance Technology of the Vertical Shaft

摘要

After the thaw of the frozen wall, the annular space of freezing holes and freezing wall of the shaft which constructed by full-freezing method could easily become a water channel which was a serious threat to the mine safety. The west air shaft of Qian Yingzi mine encountered this kind of situation. Through the investigation and analysis, we adopted "point to point splitting grouting method" to govern it and obtained a good effect on governance of the freezing hole annular space water channels. The effect of the governance is outstanding and provide scientific basis for the Wanbei Coal-electricity Group and the similar situation across the country.