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Construction method for super-large-section tunnel step of soft rock in karst cave development stratum

A technology with extra-large cross-section and construction method, which is applied in tunnels, tunnel linings, underground chambers, etc., and can solve problems such as increased difficulty in implementing karst cave treatment measures, inoperability of large machinery, and low degree of mechanization support.

Active Publication Date: 2021-08-17
RES INST OF HIGHWAY MINIST OF TRANSPORT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, a smaller guide tunnel will increase the relative size of the cave, and the hazard of the cave filling surge disaster will increase; the narrow working space will make it more difficult for construction personnel to evacuate safely, and large machinery will not be able to work after the disaster occurs; The karst caves are exposed one by one, and the karst caves are disturbed many times and the implementation of karst cave treatment measures is more difficult; a disaster in a single pilot tunnel causes the excavation of the face to stop, which will affect the construction progress of other pilot tunnels, and the construction organization is difficult
In addition, the working space of the partial excavation method is narrow and the process is complicated. It is impossible to use large-scale mechanical equipment such as multi-arm rock drilling rigs, arch installation machines, and wet spraying manipulators. The degree of mechanization is low, and it is difficult to achieve rapid construction of large-section tunnels.
[0004] With the development of surrounding rock reinforcement technology and large-scale construction machinery, the technical conditions for large-section or full-section excavation in soft rock large-section tunnels have gradually matured. In technology, there is no good solution to the problem of stratum construction with karst cave development

Method used

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  • Construction method for super-large-section tunnel step of soft rock in karst cave development stratum
  • Construction method for super-large-section tunnel step of soft rock in karst cave development stratum
  • Construction method for super-large-section tunnel step of soft rock in karst cave development stratum

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Comparison scheme
Effect test

Embodiment 1

[0075] Embodiment 1: This embodiment is a tunnel with three lanes and three centers, and the cross-sectional area of ​​the tunnel is about 167m 2 , the technical scheme of construction method comprises the following steps:

[0076] Step (1): Use geological radar to detect the range 30m in front of the face of the tunnel. The detection results show that the lithology of the face is soluble rock, the rock mass is relatively hard, the rock mass is broken, and the groundwater is not developed; the arch survey line The map shows that the radar wave reflection is strong in the 9-15m section in front of the tunnel face, and a large-scale karst cave may be developed. The groundwater in the measured section is not developed, and the surrounding rock is grade Ⅴ.

[0077] Step (2): According to the condition of the surrounding rock and the development of the karst cave, it is judged that the advanced support adopts the advanced large pipe shed. The design length of the advanced large pip...

Embodiment 2

[0083] Embodiment two: the present embodiment is a three-lane three-center circle tunnel, and the cross-sectional area of ​​the tunnel is about 167m 2 , the technical scheme of construction method comprises the following steps:

[0084] Step (1): Using geological radar to detect the area 30m in front of the face of the tunnel, the detection results show that the lithology of the face is soluble rock, the rock is relatively hard, the rock mass is broken, and the groundwater is not developed; the map shows that the measured section is basically maintained At present, the condition of the face is that the rock quality is relatively hard, the rock mass is broken, and there is no obvious water body, and the surrounding rock grade is V grade.

[0085] Step (2): According to the condition of the surrounding rock and the development of the karst cave, it is judged that the advanced support adopts the advanced large pipe shed. The design length of the advanced large pipe shed is 20m, a...

Embodiment 3

[0091] Embodiment three: the present embodiment is a three-lane three-center circle tunnel, and the cross-sectional area of ​​the tunnel is about 167m 2 , the technical scheme of construction method comprises the following steps:

[0092] Step (1): Using geological radar to detect the area 30m in front of the face of the tunnel, the detection results show that the lithology of the face is soluble rock, the rock is relatively hard, the rock mass is relatively broken, and the groundwater is not developed; the survey line map of the vault shows There is a section with strong radar reflection in the 3-9m section ahead, and it is speculated that there is a large-scale dissolved cavity in this section; the sidewall line map shows that there is a section with strong radar reflection in the section 2m-5m ahead, and it is speculated that there may be a weak interlayer or a dissolved cavity in this section. The stability of the surrounding rock is average, and the grade of the surroundi...

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Abstract

The invention relates to the technical field of tunnel advance support measure construction, in particular to a construction method for a super-large-section tunnel step of soft rock in a karst cave development stratum. The construction method includes the steps of (1) confirming a surrounding rock grade and a front surrounding rock condition; (2) judging a karst development condition according to the surrounding rock condition, judging whether a karst cave in front of a tunnel arch develops or not according to the karst development condition, and determining advance support measures and design parameters according to the surrounding rock grade and the karst cave development condition; and (3) synchronously excavating upper and lower steps according to step design parameters. Compared with the prior art, the construction method for the super-large-section tunnel step of the soft rock in the karst cave development stratum has the beneficial effects that the step construction method is applied to super-large-section tunnel construction of the karst cave development stratum, and the advance support measures are adopted according to the surrounding rock grade and karst cave development condition classification, so that primary support and karst cave treatment measures are determined according to a tunnel face karst cave exposure condition and a tunnel face state in a geological sketch result, a specific construction mode is adopted for the karst cave development stratum, and the method is targeted and more accurate.

Description

technical field [0001] The invention relates to the technical field of construction of advanced support measures for tunnels, in particular to a step construction method for tunnels with super large cross-sections in soft rock formations with developed karst caves. Background technique [0002] According to the section division standard of the International Tunneling Association, the cross-sectional area of ​​a super-large section tunnel is > 100m 2 , Highway extra-large section tunnels are generally three-lane or four-lane tunnels. For extra-large section tunnels with Class IV and Class V surrounding rocks, partial excavation methods such as CD method, CRD method, and double-side pilot pit method are generally used, that is, the entire excavation section is divided into multiple parts for excavation, and each part is excavated by temporary support. To protect and stabilize the surrounding rock, remove the temporary support after the support structure is closed, and the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/00E21D11/00E21D11/10G01V9/00F42D3/04
CPCE21D9/00E21D9/006E21D11/006E21D11/10G01V9/00
Inventor 万飞王华牢李磊张翾李雪峰
Owner RES INST OF HIGHWAY MINIST OF TRANSPORT
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