High ground stress soft rock stress-relief construction method

A construction method and high ground stress technology, applied in underground chambers, earthwork drilling, wellbore lining, etc., can solve problems such as difficulty in ensuring tunnel construction quality, lining cracking and damage, affecting construction progress, etc., achieving low cost and convenient operation. , the effect is obvious

Inactive Publication Date: 2010-02-10
INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI
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Problems solved by technology

At present, conventional construction methods are difficult to adapt to the large deformation requirements of soft rock tunnels. During the construction process, the lining is prone to cracking and damage, and continuous repair construction is re

Method used

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  • High ground stress soft rock stress-relief construction method
  • High ground stress soft rock stress-relief construction method

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Embodiment Construction

[0020] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0021] The principle of pressure relief method for high ground stress soft rock tunnels is as follows: according to the characteristics of large deformation of high ground stress soft rock tunnels, prestressed anchor cables are used to control the rise of the inverted arch of the tunnel, and foam boards are used to absorb the large rheological deformation of the tunnel.

[0022] A construction method for pressure relief of high ground stress soft rock, the specific construction steps are as follows:

[0023] 1. Anchor spray support construction, anchor spray support construction must closely follow the tunnel face. Remove dangerous rocks, and use high-pressure air to clean up the powder rock and sundries on the excavation surface. According to the design requirements, arrange the installation positions of stakeout bolts 1 along the circumference of the hole, and drill...

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Abstract

The invention discloses a high ground stress soft rock stress-relief construction method which comprises the following steps: A. anchor shotcreting constructing, tagging the anchor shotcreting constructing with heading, and eliminating dangerous rock; B. cystosepiment hanging, carrying out hanging construction on polystyrene cystosepiment; C. inverted arch excavating and U shape steel spanning, lining tunnel to a ring, and carrying out re-spraying with shotcrete on clearance of steel racks; D. inverted arch backfilling, carrying out construction of a waterproof barrier layer after completing spanning of the U shape steel so as to conserve concrete; E. waterproof barrier layer constructing, carrying out waterproof barrier layer constructing when the convergence rate of tunnel is stabilized;F. secondary lining constructing, carrying out secondary lining constructing when the waterproof barrier layer constructing is completed; and G. prestress anchor line constructing, determining a holesite of an anchor line and the drilling direction through field lofting, and clearing the location of the hole site. The construction method has obvious effect for controlling large deformation of the soft rock with the high ground stress, is simple and convenient, and has the advantages of simple operation, obvious effect and relatively low cost.

Description

technical field [0001] The design of the invention relates to the technical field of highway tunnel construction, and more specifically relates to a pressure relief construction method for high ground stress soft rock. Background technique [0002] With the continuous development of transportation infrastructure in western my country, especially the construction of high-grade highways, more and more soft rock tunnels pass through areas of high ground stress. The confining pressure of soft rock tunnel with high ground stress not only has large deformation, but also has highly nonlinear mechanical properties. At present, conventional construction methods are difficult to adapt to the large deformation requirements of soft rock tunnels. During the construction process, the lining is prone to cracking and damage, and continuous repair construction is required. This not only seriously affects the construction progress and increases construction costs, but also affects the constru...

Claims

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Application Information

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IPC IPC(8): E21D11/00E21D11/10
Inventor 陈卫忠田洪铭郭小红乔春江
Owner INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI
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