A Construction Method for Stability Control of Biased Tunnel Side Wall

Abstract

The invention discloses a construction method for controlling the stability of the side wall of a biased tunnel, comprising steps: step 1, determining the basic mechanical parameters of the surrounding rock; The tunnel side wall support scheme adopted by the side wall is determined separately; step 3, tunnel excavation and tunnel side wall synchronous support construction; step 4, next segment excavation and tunnel side wall synchronous support construction: repeat steps 1 to Step 3: Excavating the next segment and synchronously supporting the tunnel side wall; Step 5: Repeating step 4 several times until the entire excavation of the bias tunnel and the synchronously supporting the tunnel side wall are completed. The method of the invention has simple steps, is convenient to implement, and has good application effect. According to the judgment of the instability of the tunnel side wall, the support structure adopted in the tunnel side wall support system of the biased tunnel is designed, and the side wall enclosure of the biased tunnel can be effectively controlled. rock deformation and damage, 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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