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.
CN113266372AActive Publication Date: 2021-08-17RES INST OF HIGHWAY MINIST OF TRANSPORT
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
RES INST OF HIGHWAY MINIST OF TRANSPORT
Publication Date
2021-08-17

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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.
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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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