Gas axial isolation belt in tunnel gas accumulation area and construction method thereof

A technology for gathering areas and isolation zones, which is applied in tunnels, tunnel linings, gas discharge, etc., can solve problems that are likely to cause major safety accidents and serious safety problems, reduce the risk of seepage and diffusion, and reduce the pressure of gas seepage prevention Effect

Inactive Publication Date: 2019-01-01
CHINA RAILWAY 16TH BUREAU GRP CO LTD +1
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  • Claims
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AI Technical Summary

Problems solved by technology

The so-called gas tunnel refers to the tunnel that passes through the gas formation. Therefore, as more and more tunnels are built through the gas-containing formation, during the construction and operation of the tunnel, if the management and prevention are not done properly, it is easy to cause major safety accidents. Its safety problem is very serious

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  • Gas axial isolation belt in tunnel gas accumulation area and construction method thereof
  • Gas axial isolation belt in tunnel gas accumulation area and construction method thereof
  • Gas axial isolation belt in tunnel gas accumulation area and construction method thereof

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Embodiment Construction

[0033] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0034] see Figure 1-Figure 5 , a gas axial isolation zone in the gas accumulation area of ​​the tunnel, drawing on the concept of partition waterproofing in tunnel waterproofing, in the gas seepage prevention construction, a structure similar to a water stop is constructed to separate the high gas coal seam from the Generally separated by strata, it includes a regional grouting zone 1 and a gas isolation ring 3, both of which are set outside the head and tail of the tunnel 7, and the tunnel 7 is excavated in the coal seam where gas has accumulated 4, the high gas support 2 is applied at the initial position of the tunnel 7, and the anti-seepage support 5 of the coal penetration section is implemented at the end position of the tunnel 7.

[0035] Circumferential excavation is carried out on the outside of the beginni...

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PUM

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Abstract

The invention discloses a gas axial isolation belt in a tunnel gas accumulation area. The gas axial isolation belt comprises zone grouting belts and gas isolation rings. The zone grouting belts and the gas isolation rings are arranged on the outer sides of the head and tail positions of a tunnel. The tunnel is excavated on a coal seam with gas accumulation, the initial position of the tunnel is constructed with high gas support, the tail end position of the tunnel is constructed with coal penetrating section anti-seepage support, and the coal penetrating section anti-seepage support is constructed at a coal seam penetrating section of the tunnel. A coal seam on the outer side of the coal penetrating section anti-seepage support is arranged as the gas accumulation area. The gas isolation rings and the zone grouting zones are constructed on the outer sides of the head and tail positions of the tunnel, and gas is isolated by the interaction of the gas isolation rings and the zone groutingbelts to prevent the gas from diffusing in the axial direction of the tunnel, and the porosity and permeability coefficient of the area are reduced. The constructed gas axial isolation belt of the gas accumulation area of the tunnel can meet the gas anti-seepage requirements of a tunnel entrance working area, and can especially reduce the gas anti-seepage pressure in the later operation stage.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to a gas axial isolation zone in a gas accumulation area of ​​a tunnel and a construction method thereof. Background technique [0002] The current road construction is developing rapidly, the proportion of tunnels is large, and there are more and more gas tunnels. Gas is a colorless, odorless gas that is insoluble in water, with a relative density of 0.554 and a permeability 1.6 times that of air. The main component is alkanes, of which methane accounts for the vast majority. When it reaches a certain concentration, it can burn or explode. . The so-called gas tunnel refers to the tunnel that passes through the gas formation. Therefore, as more and more tunnels are built through the gas-containing formation, during the construction and operation of the tunnel, if the management and prevention are not done properly, it is easy to cause major safety accidents. Its safety...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/00E21D11/10E21F7/00
CPCE21D11/003E21D11/10E21F7/00
Inventor 马栋闫肃王武现李庚许李永刚杨彦岭黄志平田小路
Owner CHINA RAILWAY 16TH BUREAU GRP CO LTD
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