Direct roof strong karst aquifer water tunnel boring technology to combat

Abstract：In mine of Xiaoma, when a 一5 seam coal seam roof in driving, a number of direct gray roof L5 strong karst aquifer water will inrush, which severely affected production safety.According to 一5 coal seam existence and hydrogeological conditions, on the basis of the analysis on deposits factor in water-filled and the combination of tunneling techniques, the technology of pre-grouting reinforcement is used in the eastern coal roadway driving track 一5 for prevention and treatment of roof water.They are a set of processess such as exploration holes along the seam, inquire hole tunneling out of coal, temporary support, exploration holes ahead of roof, undercover boring, drilling grouting and permanent support measures.Application of roof control technology ahead of pre-grouting process control roof water is domestic initiative.The practice proved that the roof control technology ahead of pre-grouting can control roof water inrush effectively and set a record in the technology of inrush in strong karst aquifer tunneling under the direct control of roof water.Its security benefit are effective and conspicuous, which can be used in the similar conditions of water prevention and controling.

Keyword：hydrogeology;strong karst aquifer;exploration holes;water prevention and treatment;