Construction method for stability control of side walls of bias tunnel

Abstract

The invention discloses a construction method for stability control of side walls of a bias tunnel. The construction method comprises the first step of determining basic mechanical parameters of surrounding rock; the second step of determining tunnel side wall supporting schemes: respectively determining the tunnel side wall supporting schemes adopted for the left and right tunnel side walls of acurrently constructed section; the third step of performing tunnel excavation and tunnel side wall synchronous support construction; the fourth step of performing next section excavation and tunnel side wall synchronous support construction: executing the first step to the third step again, and performing next section excavation and tunnel side wall synchronous support construction; the fifth stepof repeating the fourth step many times, until all the excavation and tunnel side wall synchronous support construction process of the bias tunnel is completed. The method has simple steps, is convenient to implement and good in use effect, the support structure adopted for a tunnel side wall support system for the bias tunnel is designed according to the instability of the side walls of the tunnel, and the deformation and fracture of the side wall surrounding rock of the bias tunnel can be effectively controlled, and the construction cost is low.

Description

technical field [0001] The invention belongs to the technical field of tunnel construction, and in particular relates to a construction method for controlling the stability of a side wall of a biased tunnel. Background technique [0002] In recent years, with the rapid development of my country's transportation industry, a large number of deep-buried mountain tunnels will pass through water-rich and high-in-situ stress areas. Improper construction will easily lead to the reduction of the tunnel section and the instability of the supporting structure, which will seriously affect the rapid construction of the tunnel and the safe operation in the future. For a long time, many experts and scholars have carried out in-depth research on the deformation mechanism and support technology of soft rock tunnels (also known as weak surrounding rock tunnels). He Benguo et al. took the Muzhailing high geostress tunnel as the engineering background, analyzed the deformation characteristics,...

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Problems solved by technology

[0004] Although many research results have been obtained in the deformation of surrounding rock and support technology of soft rock tunnels, and the research on the collapse and floor heaving of soft rock tunnels is also relatively in-depth, but the research on the common tunnel spall disasters in soft rock tunnels is still incomplete. Rarely, on-site treatment measures for slabs still rely on construction experience, and the treatment effect is not ideal

Especially for soft rock tunnels with unstable side walls, there is almost no construction experience for reference

Moreover, when the soft rock tunnel being constructed is a biased tunnel, due to terrain asymmetry or geological stratum factors, the loads on both sides of the tunnel structure are asymmetrical, resulting in biased pressure, and the surrounding rock instability states of the side walls of the tunnel on both sides are inconsistent. Wall stability control construction is more difficult

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