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Soft rock tunnel excavation method based on anchor bolt stress

A technology for tunnel excavation and force analysis, which is applied in the direction of tunneling, bolt installation, earthwork drilling and mining, etc., to achieve the effects of convenient implementation, reasonable design, and simple method steps

Inactive Publication Date: 2017-03-15
XIAN UNIV OF SCI & TECH
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  • Claims
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a soft rock tunnel excavation method based on the force analysis of bolts in view of the deficiencies in the above-mentioned prior art. The method has simple steps, reasonable design, convenient implementation and good use effect. The surrounding rock deformation of soft rock tunnels determines the reserved excavation amount, which can effectively solve the problem of determining the reserved deformation amount of soft rock tunnels, and avoid the repair work of soft rock tunnels, and the construction cost is low

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  • Soft rock tunnel excavation method based on anchor bolt stress

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Embodiment Construction

[0040] Such as figure 1 Shown is a soft rock tunnel excavation method based on the force analysis of anchor bolts. The soft rock tunnel 1 to be constructed is excavated in multiple segments along the longitudinal extension direction of the tunnel from the back to the front. The multiple segments The excavation methods are the same; when excavating any segment of the soft rock tunnel 1, the following steps are included:

[0041] 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 synchronously;

[0042] Step 2. Determination of the reserved excavation volume of the tunnel: according to the basic mechanical parameters of the surrounding rock determined in the first step, the reserved excavation volume of the currently constructed section is determined; ...

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Abstract

The invention discloses a soft rock tunnel excavation method based on anchor bolt stress and the soft rock tunnel is excavated by a plurality of sections in a longitudinally direction of the tunnel from rear to front. The method for excavating any section of the soft rock tunnel comprises the following steps: first, determing the basic mechanical parameters of surrounding rock; second, determing the reserved excavation capacity of tunnels: determing the capacity of reserved excavation of the current construction section according to a theoretical value S of the soft rock tunnel inward displacement after the completion of supporting, the S is the sum of plastic displacement of surrounding rock in soft rock tunnel and displacement after shaping deformation of surrounding rock in soft rock tunnel; third, the tunnel is excavated; fourth, the next section is excavated; fifth, repeating step fourth until the full excavation of the soft rock tunnel is completed. The soft rock tunnel excavation method has the advantages of simple steps, reasonable design and convenient implementation, and has good effect. The excavation capacity is determined according to the deformation of the surrounding rock of the soft rock tunnel, which can solve the problem of the reserve deformation of the soft rock tunnel, avoid the problem of soft rock tunnel repair work and cost less.

Description

technical field [0001] The invention belongs to the technical field of tunnel construction, and in particular relates to a soft rock tunnel excavation method based on force analysis of bolts. Background technique [0002] In recent years, with the rapid development of my country's highway and railway construction, the construction of soft rock tunnels under the conditions of large buried depth and high ground stress has become one of the inevitable trends in the development of the transportation field. Wushaoling Tunnel, Zhongnanshan Tunnel and Xiakou Tunnel, etc. Due to the harsh engineering geological conditions, the self-supporting capacity of the surrounding rock is poor, and the deformation of the soft rock tunnel is severe. If the support is not timely or the plan is unreasonable, large deformation of the surrounding rock and damage to the lining structure will easily occur. For this reason, a large number of experts, scholars and on-site engineering technicians have c...

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Application Information

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IPC IPC(8): E21D9/00E21D20/00
CPCE21D9/00E21D20/00Y02E10/20
Inventor 于远祥陈宝平
Owner XIAN UNIV OF SCI & TECH
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