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Soft rock large-deformation tunnel supporting system and construction method thereof

A construction method and technology of large deformation, applied in tunnels, tunnel lining, earthwork drilling and other directions, can solve problems such as large deformation of soft rock tunnels, and achieve the effect of improving self-supporting capacity, good adaptability and ensuring safety

Inactive Publication Date: 2015-08-19
CHANGAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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  • Soft rock large-deformation tunnel supporting system and construction method thereof
  • Soft rock large-deformation tunnel supporting system and construction method thereof
  • Soft rock large-deformation tunnel supporting system and construction method thereof

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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

The invention discloses a soft rock large-deformation tunnel supporting system and a construction method thereof. The system comprises a forepoling, a preliminary bracing, a waterproof layer, a secondary lining and other main structures, wherein the structures are constructed in sequence according to construction procedures. Surrounding rock is reinforced through advanced small pipe grouting by means of the forepoling, the preliminary bracing comprises lengthened anchor rods, a primary spraying layer, steel arches and a re-jetting layer, feet-lock bolts are further arranged at the positions of an upper bench and arch feet to be welded to the steel arches, the adjacent steel arches are connected through longitudinal connecting ribs, and the secondary lining is constructed at last to form the supporting system. The steps are simple and linked with one another, supporting lag caused by idling of labor force is avoided, and large-deformation of tunnels is well controlled.

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 Applications(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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