冻结钻孔突水综合防治技术的应用与研究

Integrated Control Technology Application and Study on Water Inrush of Freezing Holes

冻结法凿井工程中,采用全深冻结时,冻结深度一般超出井筒深度15m左右。冻结结束后由于封孔质量不达标等问题,冻结孔极可能会成为各含水层之间的导水通道。巷道掘进过程中,揭露下部冻结钻孔时,易发生突水,可能会导致井筒倾斜、淹井等重大灾害事故。本文结合纳林河二号矿井井筒的具体情况,在动水条件下,采用在地面对冻结钻孔射孔注浆与井筒分水平针对冻结管壁后注浆相结合的封堵新技术,成功完成对井筒周围冻结管环形空间的充填及含水层的封堵,为今后类似工程提供宝贵经验。

In shaft sinking project with ground freezing,when deep thick freezing is used,the freezing depth is 15m more than the shaft depth.Because of unqualified sealing and other problems after the freezing,the holes are most likely to become water channels of different aquifers.During the driving,uncovering the holes in the lower part is liable to water inrush,which may cause borehole deviation,inundation and other serious disasters.Considering No.2 well shaft,Nalinhe Mine,under the condition of water flowing,injection grouting for freezing holes on the ground and backwall grouting for freezing pipes are combined to fill the pipes' ring space and to seal the aquifers successfully,which is valuable for the similar projects.