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Construction technology of tunnel penetrating through overlapping section of rockburst section and low-gas area

A construction technique and low-gas technology, applied in tunnels, tunnel linings, gas discharge, etc., can solve the problems of increased technology and management risks in tunnel construction, and achieve the effects of reducing secondary disasters, weakening fragility, and reducing intensity

Inactive Publication Date: 2022-02-11
CCCC THIRD HARBOR ENG +2
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  • Application Information

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Problems solved by technology

When there are multiple unfavorable geological superimpositions, it will increase the technical and management risks to the tunnel construction

Method used

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  • Construction technology of tunnel penetrating through overlapping section of rockburst section and low-gas area
  • Construction technology of tunnel penetrating through overlapping section of rockburst section and low-gas area
  • Construction technology of tunnel penetrating through overlapping section of rockburst section and low-gas area

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with accompanying drawing.

[0024] see Figure 1 to Figure 4 , the construction technology of the tunnel crossing the rockburst section and the superimposed section of the low gas area of ​​the present invention adopts the excavation method of upper and lower steps, and includes the following steps:

[0025] Step 1. Before the excavation of the main tunnel in the superimposed section of the rockburst section and the low gas area, the geological radar method combined with the advanced drilling method is used to verify the advanced geological forecast, and initially determine whether there is coal seam or gas ahead; the advanced drilling method is to use the coal mine Drill five advance probe holes 11, 12, 13, 14, 15 on the tunnel face with a fully hydraulic tunnel drilling rig. The diameter of the advance probe holes is φ76mm, and four advance probe holes 11, 11, 12, 13, 14, arrange an advanced soundi...

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Abstract

The invention discloses a construction technology of tunnel penetrating through an overlapping section of a rockburst section and a low-gas area, which adopts an upper and lower step excavation method and comprises the following steps: 1, before a main tunnel of the tunnel is excavated, advanced geological forecast verification is performed by adopting an advanced drilling method; 2, stress release is conducted on the unexcavated rockburst section through an advanced exploding hole, a portable gas detector is used for detecting the gas concentration of the tunnel face and the working position, and high-pressure water spraying is conducted on the tunnel face and the tunnel wall before normal excavation; 3, eleven ultra-deep shot holes are drilled at first; 4, gas detection is conducted through the ultra-deep shot holes, and after the requirements are met, the eleven ultra-deep shot holes and the common shot holes are charged with explosives for blasting; 5, after the tunnel face is excavated, primary supporting is conducted; 6, a gas isolation layer is constructed; and 7,secondary lining is performed on the inner surface of the gas isolation layer by adopting C35 concrete doped with an airtight agent. The risk of accidents can be effectively reduced, and safe construction is ensured.

Description

technical field [0001] The invention relates to a construction technique for a tunnel passing through a superimposed section of a rockburst section and a low gas area. Background technique [0002] In recent years, the construction of highways and high-speed railways in Southwest my country has been booming, and a large number of tunnel projects have been produced. During the excavation of tunnels, it is inevitable to encounter various unfavorable geological areas, which threaten the safety of tunnel operators and affect the normal operation of tunnels. Serious hidden dangers to the safety of people's lives and property. Unfavorable geology is especially manifested as fractured and broken zones, rock bursts, water and mud inrush, karst and gas. When there are multiple unfavorable geological superpositions, it will increase the technical and management risks to the tunnel construction. Contents of the invention [0003] The purpose of the present invention is to overcome t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/10E21D11/38E21F7/00E21F17/00E21F17/18
CPCE21D11/10E21D11/105E21D11/102E21D11/38E21F7/00E21F17/00E21F17/18
Inventor 林李前陈航博蔡斌陈浩侯硕智
Owner CCCC THIRD HARBOR ENG
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