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Soft Rock Large Deformation Tunnel Support System and Its Construction Method

A construction method and large deformation technology, applied in tunnels, tunnel linings, earthwork drilling and mining, etc., can solve problems such as large deformation of soft rock tunnels, and achieve the effect of improving self-supporting capacity, reducing deformation, and simple and compact steps

Inactive Publication Date: 2017-05-31
CHANGAN UNIV
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  • Claims
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Problems solved by technology

[0005] The purpose of the present invention is to aim at the defects and deficiencies in the prior art, to provide a support system and construction method for soft rock large deformation tunnels, which can effectively solve the problem of encroachment caused by large deformation of soft rock tunnels, thereby ensuring tunnel construction Security and post-operations security

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  • Soft Rock Large Deformation Tunnel Support System and Its Construction Method
  • Soft Rock Large Deformation Tunnel Support System and Its Construction Method
  • Soft Rock Large Deformation Tunnel Support System and Its Construction Method

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Embodiment Construction

[0035] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0036] see figure 1 , the support system provided by the present invention includes: advanced support, primary support, waterproof layer 5 and secondary lining 7 arranged sequentially from outside to inside along the radial direction of the tunnel. Anchor rod 1, initial spraying layer 2, steel mesh 11, steel arch frame 3 and re-spraying layer 4.

[0037] The advance support is formed by grouting the advance small conduit 10, which is an important measure for pre-reinforcement. see Figure 4 , the advanced small catheter 10 is constructed along the circumferential direction of the tunnel within 120° of the vault at the tunnel face, the circumferential distance of the advanced small catheter 10 is 30-50cm, the extrapolation angle is 3-5°, and the length is 6-8m .

[0038]The extended anchor 1 adopts self-advancing grouting anchor, and the length of the anch...

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Abstract

A support system and construction method for large deformation tunnels in soft rock, including main structures such as advance support, primary support, waterproof layer and secondary lining, and each structure is constructed sequentially following the construction process. The advance support is to strengthen the surrounding rock through the advance small conduit grouting. The initial support consists of an extended anchor rod, a primary spray layer, a steel arch frame and a respray layer. There are also lock foot anchor rods and steel arches at the upper steps and arch feet. Frames are welded, adjacent steel arches are connected by longitudinal connecting bars, and finally secondary lining is applied to form a supporting system. The steps of the invention are simple and interlocking, avoiding the problem of support delay caused by idle work, and have beneficial effects on controlling the large deformation of the tunnel.

Description

technical field [0001] The invention relates to the field of construction methods for large-deformation tunnels in soft surrounding rock, in particular to a support system for large-deformation tunnels in soft rock and a construction method thereof. Background technique [0002] With the development of my country's transportation industry, more and more highway tunnels have been put into construction. my country is a country with complex geology, and it is inevitable to build tunnels in soft rock and large deformation geological areas. At present, the commonly used method for tunnel construction is the new Austrian method. The new Austrian method follows the principle of "less disturbance, early spraying and anchoring, frequent measurement, and tight sealing". It has wide adaptability to tunnels under ordinary geological conditions. However, for special geological conditions For tunnels under certain conditions, such as soft rock with large deformation, it is difficult to en...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D11/00E21D11/10E21D20/00E21D11/18
CPCE21D11/00E21D11/105E21D11/18E21D11/38E21D20/00
Inventor 谢永利张玉伟翁效林李又云
Owner CHANGAN UNIV
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