Coordination deformation support system suitable for soft-rock large-deformation tunnel, and support method of support system

A large deformation and tunnel technology, applied in the coordinated deformation support system and its support field, can solve the problems of limited deformation capacity, increased engineering cost, initial support rupture, etc., to reduce requirements, save engineering cost, and have good integrity. Effect

Inactive Publication Date: 2016-09-14
INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 1. The surrounding rock undergoes large deformation over time, and the traditional primary lining is a concrete layer sprayed along the surface of the surrounding rock as a whole. Its deformation capacity is limited, and it is easy to appear blocks, falling off, crushing, etc., resulting in primary support rupture
[0007] 2. Due to the above defects of the primary lining structure, in t

Method used

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  • Coordination deformation support system suitable for soft-rock large-deformation tunnel, and support method of support system
  • Coordination deformation support system suitable for soft-rock large-deformation tunnel, and support method of support system
  • Coordination deformation support system suitable for soft-rock large-deformation tunnel, and support method of support system

Examples

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Effect test

Embodiment 1

[0044] A support system suitable for soft rock tunnels such as figure 1 As shown, it includes an anchor rod 1, a primary lining (that is, the first protective layer) composed of a concrete sprayed layer 2 and a compressible pad 3, a foam concrete filling layer 4, a secondary lining 5 and an inverted arch 6.

[0045] Wherein, the bolt 1 goes deep into the stable rock mass, the first protective layer is closely attached to the inner wall of the surrounding rock, the inner side of the first protective layer is provided with a foamed concrete filling layer 4, and the inner side of the foamed concrete filled layer 4 is provided with a secondary lining 5.

[0046]The foam concrete filling layer 4 can absorb the long-term deformation of the surrounding rock, reduce the deformation pressure of the secondary lining caused by the long-term deformation of the surrounding rock, and ensure the long-term stability of the secondary lining. The foamed concrete filling layer 4 and the first pr...

Embodiment 2

[0067] The formula of the thickener added in the foam concrete is: silica fume: 60 parts; bentonite: 70 parts; xanthan gum: 1 part. Pour into a container and stir until smooth. When the thickener is in use, the weight of the thickener accounts for 8% of the weight of the cement in the foam concrete.

Embodiment 3

[0069] The formula of the thickener added in the foam concrete is: silica fume: 100 parts; bentonite: 40 parts; polyacrylamide: 0.3 parts. Pour into a container and stir until smooth. When the thickener is in use, it is added according to the weight of the thickener accounting for 10% of the weight of the cement in the foam concrete.

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Abstract

The present invention relates to a coordination deformation support system suitable for a soft-rock large-deformation tunnel, and a support method of the support system. The system comprises a tunnel primary support structure and a secondary lining; the tunnel primary support structure comprises an anchoring support structure deep into a stable rock, a first protection layer tightly attached to an inner wall of the surrounding rock, and a foam concrete filling layer positioned at an inner side of the first protection layer; the secondary lining is disposed at an inner side of the foam concrete filling layer; and the first protection layer is formed by a concrete spraying layer having the same thickness in the radial direction of the tunnel and a plurality of compressible cushion blocks. The concrete layer is separated by the compressible cushion blocks, integral flexibility of the concrete layer is largely enhanced, flexible support characteristics of a primary lining can be fully showed, fracture of the primary lining caused by large deformation of the soft rock is prevented, and integrity of the support system is good under combined effects of the foam concrete filling layer, the anchoring support structure and the secondary lining.

Description

technical field [0001] The invention belongs to the technical field of highway tunnel construction, and in particular relates to a coordinated deformation support system and a support method suitable for soft rock large deformation tunnels. Background technique [0002] A tunnel is a complex of surrounding rock and supporting structures. Tunnel excavation destroys the initial stress balance of the strata, resulting in stress release of the surrounding rock and deformation of the cavern. Excessive deformation will lead to loosening or even collapse of the surrounding rock. Around the cavern after excavation, steel, concrete and other supports are applied to provide resistance to the surrounding of the cavern and control the deformation of the surrounding rock. This support system in the tunnel after excavation is called the support of the tunnel. [0003] After the excavation of the tunnel, the outer layer of flexible support (usually shotcrete support) close to the surround...

Claims

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Application Information

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IPC IPC(8): E21D11/00E21D11/10E21D20/00
CPCE21D11/003E21D11/105E21D20/00
Inventor 田洪铭陈卫忠谭贤君伍国军于洪丹赵武胜
Owner INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI
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