Tunnel primary support reinforcement treatment method

Abstract

The invention relates to a tunnel primary support reinforcement treatment method. The method comprises the following steps of constructing an intercepting ditch in a confluence ponding area, and draining the earth surface confluence ponding area; measuring and setting out a tunnel primary support risk section, determining a primary support reinforcing position, and grouting the primary support reinforcing position by arranging a small grouting guide pipe to realize primary support reinforcing; according to a clearance convergence monitoring point, a vault subsidence monitoring point and a ground surface subsidence monitoring point which are arranged at the primary support risk section, detecting the deformation amount of the primary support and the surrounding rock variation amount of theprimary support after grouting; and when the deformation amount of the primary support is not within the threshold range of the deformation amount of the primary support and the variation amount of the primary support surrounding rock is not within the threshold range of the variation amount of the primary support surrounding rock, carrying out slurry mixing and re-grouting. According to the method, the intercepting ditch is built in the water accumulation area to realize intercepting and drainage; and after grouting reinforcement of the primary support, continuous monitoring is conducted, grout is readjusted, unstable surrounding rock and the primary support are grouted again, and the stability of the primary support is guaranteed.

Description

technical field [0001] The invention relates to the technical field of civil engineering, in particular to a processing method for initial support and reinforcement of a tunnel. Background technique [0002] During the construction of mountain highway tunnels, unfavorable geological conditions such as karst cavities and water-rich fault fracture zones are encountered from time to time, and the unfavorable geology can easily lead to water inrush and mud inrush and tunnel deformation. In karst tunnels with abundant water and developed fissures, the excavation of the tunnel can easily induce water inrush, while the initial support cracking water inrush occurs with the inrush water, which endangers the safety of tunnel construction and operators, and seriously affects the tunnel. In the later construction and operation, it is necessary to deal with the water and mud inrush and tunnel deformation often caused by bad geological conditions in a timely and effective manner. [0003...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the above technical problems, especially when the tunnel is in a complex karst pipeline system, such as the development of surrounding rock joints, fissures and fracture structures, and the groundwater is very rich, the effect of primary support and reinforcement through the existing technology is poor, which affects the tunnel. For the later construction and operation issues, the following technical solutions are proposed:

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