Construction method of large-span asymmetrical double-arch railway tunnel under terrain bias pressure condition

An asymmetric technology for tunnel construction, applied in tunnels, tunnel linings, underground chambers, etc., can solve the problems of high engineering cost, large-area cracks in the lining, and single construction methods, so as to improve construction efficiency, reduce construction period, simplify The effect of construction steps

Active Publication Date: 2011-08-17
CHINA RAILWAY ERYUAN ENG GRP CO LTD +1
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Problems solved by technology

However, the construction method of three pilot tunnels has complicated construction procedures, and when the surrounding rock level is good, it directly affects the construction period and cost of the multi-arch tunnel.
[0004] Among them, after more than 30 years of road tunnel construction and scientific research, my country is still relatively weak in the construction of multi-arch tunnels. The main problems are reflected in the single construction method and complicated construc

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  • Construction method of large-span asymmetrical double-arch railway tunnel under terrain bias pressure condition
  • Construction method of large-span asymmetrical double-arch railway tunnel under terrain bias pressure condition
  • Construction method of large-span asymmetrical double-arch railway tunnel under terrain bias pressure condition

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Embodiment Construction

[0014] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0015] refer to figure 1 , the long-span asymmetrical double-arch railway tunnel is structurally composed of an inner cavern, a middle partition wall and an outer cavern. The construction method of the large-span asymmetrical double-arch railway tunnel under the terrain bias condition of the present invention comprises the following steps:

[0016] ① The pilot tunnel is excavated by steps, and the initial support of the pilot tunnel is implemented around the pilot tunnel;

[0017] ② After the central pilot tunnel is penetrated, pour the central partition wall backward along the tunnel axis toward the entrance, and after it reaches the design strength, set up temporary cross braces between the central partition wall of the outer cavern and the initial support of the central pilot tunnel;

[0018] ③ The inner cavern is excavated by steps, and the initia...

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Abstract

The invention provides a construction method of a large-span asymmetrical double-arch railway tunnel under a terrain bias pressure condition. The method is used for greatly shortening construction period and improving construction efficiency by simplifying construction steps. In the construction method, a middle pilot tunnel, an inside tunnel chamber and an outside tunnel chamber are sequentiallyexcavated, and unbalanced support systems are adopted in the inside tunnel chamber and the outside tunnel chamber, which effectively controls deformation of the top part of a middle partition wall and arch parts of the big main tunnel chamber and the small main tunnel chamber as well as side walls (the maximum deformation is controlled within 20mm), greatly shortens construction period, simplifies construction steps, improves construction efficiency by 30%, and the problem of water leakage on the top part of the middle partition wall is effectively solved.

Description

technical field [0001] The invention relates to a construction method of a railway tunnel, in particular to a construction method for constructing a large-span asymmetric double-arch railway tunnel under the condition of terrain bias. Background technique [0002] Double-arch tunnels have been practiced in my country for more than 30 years, and most of them are used in road tunnels. Interlaced with each other, the surrounding rock stress change and lining load conversion are very complicated, especially the middle wall is stressed, including compression, tension, bending, torsion and shearing. In addition, the stress distribution of the surrounding rock and the stress and deformation of the lining during the construction process are not clear. Crack or even collapse. [0003] At present, my country's multi-arch tunnel mainly adopts the construction method of three pilot tunnels, that is, the central pilot tunnel goes first, and the bilateral pilot tunnels follow up. The pu...

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Application Information

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IPC IPC(8): E21D9/00E21D11/10E21D11/38
Inventor 孙其清尚寒春郑宗溪赵万强高扬陶伟明曹彧谭永杰何达潘朋许怀何洋张俊儒刘鹤冰凌燕婷
Owner CHINA RAILWAY ERYUAN ENG GRP CO LTD
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