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High-ground stress soft rock highway tunnel supporting method

A technology for highway tunnels and high ground stress, applied in tunnels, tunnel linings, underground chambers, etc., can solve problems such as primary lining and secondary lining cracking and damage, difficulty in guaranteeing tunnel construction quality, and affecting construction progress, etc., to achieve long-term guarantee The effect of safety and stability, avoiding multiple renovations, and speeding up the construction progress

Active Publication Date: 2013-03-27
CCCC SECOND HIGHWAY CONSULTANTS CO LTD
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Problems solved by technology

At present, conventional support measures are difficult to adapt to the large deformation requirements of soft rock tunnels. During the construction process, the primary and secondary linings are frequently cracked and damaged. After support, the tunnel deformation exceeds the limit and requires continuous renovation. Seriously affect the construction progress, increase the construction cost, and bring more safety hazards to the construction, and the construction quality of the tunnel is difficult to guarantee

Method used

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  • High-ground stress soft rock highway tunnel supporting method
  • High-ground stress soft rock highway tunnel supporting method
  • High-ground stress soft rock highway tunnel supporting method

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Embodiment Construction

[0032] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0033] The principle of the high ground stress soft rock highway tunnel support method is as follows: Aiming at the characteristics of high stress level of surrounding rock and large deformation of the tunnel in the high ground stress soft rock highway tunnel, anchor shotcrete support + foam concrete buffer layer + secondary shotcrete + secondary lining The composite lining support form fully absorbs the large deformation of the surrounding rock and jointly bears the pressure of the surrounding rock. At the same time, the inverted arch anchor rod and anchor cable are used to control the upward deformation of the tunnel bottom, effectively protecting the permanent structure of the tunnel and ensuring the safety and stability of the tunnel.

[0034] A high ground stress soft rock highway tunnel support method, the specific construction steps are as follows:

[0035] 1. ...

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Abstract

The invention discloses a high-ground stress soft rock highway tunnel supporting method. The high-ground stress soft rock highway tunnel supporting method comprises the steps of: A. excavating upper steps, and carrying out anchor-plate retaining construction; B. erecting second I-shaped steel supports for the upper steps after ending anchor-plate retaining; C. building foamed concrete buffer layers for the upper steps; D. carrying out secondary injection concrete construction on the upper steps; E. excavating lower steps and erecting first I-shaped steel supports for the lower steps, and spraying concrete; F. pouring plastic concrete into the lower steps; G. erecting second I-shaped steel supports for the lower steps, and spraying the concrete; H. carrying out secondary lining construction on the lower steps; J. backfilling inverted arches; and K. carrying out secondary lining construction on the upper steps, that is, determining the erection position of a formwork by measurement lofting, carrying out arch crown backfill grouting by the concrete having the same grade with a tunnel lining, and dismantling a plug mold after the strength of the arch crown concrete is satisfied. The high-ground stress soft rock highway tunnel supporting method has an obvious effect on control on large deformation of a soft rock tunnel under a high-ground stress, is simple, convenient and easy and is simple in operation and low in cost.

Description

technical field [0001] The invention relates to the technical field of road tunnel construction, in particular to a method for supporting road tunnels in high ground stress soft rock. Background technique [0002] The terrain and geological conditions in western China are complex, and a large number of bridge and tunnel projects are encountered in the construction of high-grade highways. Due to the special geological and topographical conditions, long tunnels with weak surrounding rocks that pass through areas of high geostress and have harsh engineering geological environments have emerged in recent years, which has brought major challenges to the design and construction of long expressway tunnels. The biggest problem in high ground stress soft rock tunnel engineering is the structural design, construction and later maintenance of the soft rock tunnel. The prominent features of these tunnels are weak surrounding rock, high ground stress, high pressure-intensity ratio, larg...

Claims

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Application Information

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IPC IPC(8): E21D21/00E21D11/10E21D11/38
Inventor 郭小红程勇李昕陈飞飞舒恒宋继宏罗昌宏刘江申思然邵然陈卫忠戴永浩伍国军
Owner CCCC SECOND HIGHWAY CONSULTANTS CO LTD
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