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Advanced stress release construction method for severe large deformation tunnel

A technology of stress release and construction method, applied in tunnels, tunnel linings, earthwork drilling and other directions, can solve the problems of large force, large deformation of the tunnel, large burial depth, etc., to achieve easy control, ensure stability, and simple process. Effect

Pending Publication Date: 2022-03-04
THE 3RD ENG CO LTD OF CHINA RAILWAY 16TH BUREAU GRP CO LTD
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  • Description
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AI Technical Summary

Problems solved by technology

Tunnels constructed in such a complex environment generally face problems such as large buried depth and heavy stress. If weak surrounding rock is encountered during construction, large deformation of the tunnel is prone to occur

Method used

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  • Advanced stress release construction method for severe large deformation tunnel
  • Advanced stress release construction method for severe large deformation tunnel
  • Advanced stress release construction method for severe large deformation tunnel

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Embodiment Construction

[0033] The present invention will be further described now in conjunction with accompanying drawing.

[0034] see Figure 1-4 , the present invention provides a construction method for advanced stress release of severe large deformation tunnel, comprising the following steps:

[0035] S1: The distance from the excavation of the main tunnel 1 to the severe deformation section 2 of the tunnel is a multiple of the diameter of the main tunnel, and the construction is stopped, and D is the diameter of the main tunnel;

[0036] S2: Excavate a connecting cross passage 3 perpendicular to the main tunnel on one side of the excavation surface of the main tunnel. The excavation length is 3-4D, and the hole diameter is 0.4-0.6D. If it is too long, it cannot play the role of stress release, if it is too short, it will affect the stability of the positive hole;

[0037] S3: Excavate the advanced parallel pilot tunnel at the end of the connecting cross passage 3, the advanced parallel pilo...

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Abstract

The invention relates to the technical field of tunnel construction methods, in particular to an advanced stress release construction method for a seriously large-deformation tunnel, which comprises the following steps: stopping construction when the distance from a main tunnel to a seriously large-deformation section of the tunnel is a multiple of the hole diameter of the main tunnel, excavating a connecting transverse channel, stopping main tunnel construction during the period, excavating an advanced parallel pilot tunnel, and excavating an advanced parallel pilot tunnel; the leading parallel pilot tunnel is parallel to the main tunnel, the excavation direction is also consistent, main tunnel construction is recovered, and the distance between the excavation face of the parallel pilot tunnel and the excavation face of the main tunnel is kept to be 5-6 D. Compared with the prior art, stress release in the excavation process is effectively achieved in the mode that the connecting transverse channel and the leading parallel pilot tunnel are arranged in the main tunnel excavation process, and the construction efficiency is improved. Meanwhile, the size of the excavated hole diameter and construction quality control are strictly restrained, the supporting stability is guaranteed, the construction difficulty of the seriously-deformed tunnel is effectively reduced, the working procedure is simple, excavation and primary supporting of all the parts are easy to control, and the construction risk is reduced.

Description

technical field [0001] The invention relates to the technical field of tunnel construction methods, in particular to a construction method for advanced stress release of severe large deformation tunnels. Background technique [0002] my country is a mountainous country, especially in the southwestern region, where mountains are densely covered with high altitudes. Tunnels constructed in such a complex environment generally face problems such as large burial depth and large stress. If weak surrounding rock is encountered during construction, large deformation of the tunnel is prone to occur. How to safely, efficiently and economically construct tunnels with severe large deformation is a difficult problem faced by engineering circles. [0003] In the prior art, when the tunnel passes through the weak surrounding rock section with high ground stress, due to the effect of excavation and unloading, the surrounding rock will be greatly deformed, and the strength of the primary su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/10E21D11/18E21D20/00E21D21/00
CPCE21D11/105E21D11/107E21D11/183E21D21/0026E21D20/00
Inventor 马栋谭忠盛王凤喜张贺伟田伟权王双存林克王武现孙毅赵金鹏
Owner THE 3RD ENG CO LTD OF CHINA RAILWAY 16TH BUREAU GRP CO LTD
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