A method for exploring and discharging confined karst water during tunnel excavation

Abstract

The invention discloses an exploration and draining method for pressure-bearing karstic water in a tunneling process. The method comprises the steps that a high-pressure-bearing water karstic area is searched for through advanced geological prediction, the karstic area is locked, the boundary range is determined, a tunnel face is closed, and a drilling tool exits; a measuring and control device is designed and manufactured; the position of a hydraulic down-the-hole drill is determined, the angle is adjusted, and a base of the hydraulic down-the-hole drill is reinforced through a ground anchor; the tunnel face is reinforced through a reinforcing mesh in an anchoring and shotcreting mode in advance; a large-diameter drill bit drills out an installation section of the measuring and control device, and the measuring and control device is installed and reinforced; a drill bit with the diameter smaller than the diameter of a brake valve is replaced, and a drill rod passes in the brake valve and a draining pipe to continue to carry out drilling; after a drill bit of the hydraulic down-the-hole drill reaches the pressure-bearing karstic water position, drilling is stopped, and the drilling tool exits; the high-pressure-bearing karstic water is explored and drained through the measuring and control device and the hydraulic down-the-hole drill; the operation is repeatedly carried out till all water is explored and drained. The problems that surrounding rock unstability is caused by high-pressure-bearing karstic water bursting and mud bursting phenomena in the drilling machine tunneling process, and geological disasters are caused are solved.

Description

technical field [0001] The invention relates to the technical field of underground and tunnel construction, and mainly relates to a method for exploring and discharging high-pressure karst water during underground construction. This technology is applicable to the exploration and prediction of karst water in water-filled caverns of complex karst tunnels, and provides guarantee for safe construction of tunnels. technical background [0002] In the process of tunnel excavation in karst areas, high-pressure confined karst water is often encountered. Due to the complex development of karst, especially the loose structure of the weak interlayer medium, the self-supporting capacity is poor, and the pressure of the confined water is high and the capacity is large. Confined water inrush and mud inrush are more likely during excavation. The drilling and blasting method is commonly used in the construction of tunnels in mountainous areas. Once the pressurized water surges when the dr...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for detecting and discharging pressurized karst water during tunnel excavation, which is used to solve the problem of geological disasters caused by the inrush of highly pressurized karst water and the phenomenon of mud inrush caused by surrounding rock instability , to provide a safe environment for the excavation construction of karst tunnels under the action of high pressure water

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