A kind of asymmetric support method for soft rock tunnel side wall

Abstract

The invention discloses an asymmetric type support method for the side wall of a soft rock tunnel. The asymmetric type support method comprises the following steps that (1), a basic mechanical parameter of surrounding rock is determined; (2), a tunnel side wall asymmetric support structure is determined, wherein each tunnel side wall support system in the tunnel side wall asymmetric support structure comprise left side wall support units and right side wall support units, and each side wall support unit is of an asymmetric support structure; (3), construction of tunnel excavation and tunnel side wall synchronous support is carried out; (4), construction of next segment excavation and the tunnel side wall synchronous support construction is carried out; (5), step 4 is repeated for severaltimes until the entire construction process of excavation of the soft rock tunnel and synchronous support construction of side walls of the tunnel is completed. The asymmetric type support method is simple in steps, reasonable in design and convenient to realize, and good in using effect; and through the analysis of the deformation condition of the surrounding rock of the tunnel side wall under the state of the ripping-slipping shear failure, the tunnel side wall asymmetric support structure is used for effectively supporting the side wall of the tunnel, and the deformation of the surroundingrock of the side wall of the soft rock tunnel can be effectively controlled.

Description

technical field

[0001] The invention belongs to the technical field of tunnel construction, and in particular relates to an asymmetric support method for the side wall of a soft rock 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, energy accumulat...

Examples

Embodiment Construction

[0043] Such as figure 1 An asymmetric support method for the side wall of a soft rock tunnel is shown. The soft rock tunnel 1 is excavated and the tunnel side wall is supported in multiple segments along the longitudinal extension direction of the tunnel from the back to the front. The excavation and tunnel side wall support construction methods of the above sections are all the same; the soft rock tunnel 1 is a deep buried tunnel, and the buried depth of the soft rock tunnel 1 is H≥2B, where B is the opening of the soft rock tunnel 1. Excavation width, the units of H and B are m; for any segment excavation and tunnel side wall support construction, the following steps are included:

[0044] Step 1. Determination of the basic mechanical parameters of the surrounding rock: through indoor tests on the rock samples taken from the site, the basic mechanical parameters of the surrounding rock in the current construction section are tested, and the test results are recorded synchro...

technical field

[0001] The invention belongs to the technical field of tunnel construction, and in particular relates to an asymmetric support method for the side wall of a soft rock 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, energy accumulat...

Examples

Embodiment Construction

[0043] Such as figure 1 An asymmetric support method for the side wall of a soft rock tunnel is shown. The soft rock tunnel 1 is excavated and the tunnel side wall is supported in multiple segments along the longitudinal extension direction of the tunnel from the back to the front. The excavation and tunnel side wall support construction methods of the above sections are all the same; the soft rock tunnel 1 is a deep buried tunnel, and the buried depth of the soft rock tunnel 1 is H≥2B, where B is the opening of the soft rock tunnel 1. Excavation width, the units of H and B are m; for any segment excavation and tunnel side wall support construction, the following steps are included:

[0044] Step 1. Determination of the basic mechanical parameters of the surrounding rock: through indoor tests on the rock samples taken from the site, the basic mechanical parameters of the surrounding rock in the current construction section are tested, and the test results are recorded synchro...

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