Gas drainage drill hole arrangement method for large-section tunnel passing through small-included-angle coal seam

Abstract

The invention discloses a gas drainage drill hole arrangement method for a large-section tunnel passing through a small-included-angle coal seam. The method comprises the steps that a main hole of a tunnel is formed; a flat guide tunnel is formed in the side, away from the coal seam, of a main hole face; a main hole drill hole is formed in the main hole face, and a drainage pipeline is installed for gas drainage; a flat guide hole drill hole is formed in a flat guide hole face, and the drainage pipeline is installed for gas drainage. According to the gas drainage drill hole arrangement methodfor the large-section tunnel passing through the small-included-angle coal seam, the gas drainage is conducted on the side, close to the coal seam, of the main hole face through the main hole drill hole formed in the main hole face, and the gas drainage is conducted on the side, far away from the coal seam, of the main hole face through the flat guide hole drill hole formed in the flat guide holeface. The drilling depth of the side, far away from the coal seam, in the main hole is greatly reduced, the drilling construction difficulty is lowered, the gas drainage time is effectively saved, andthe gas drainage efficiency is improved.

Description

【Technical field】 [0001] The invention relates to the technical field of tunnel engineering, in particular to a method for arranging boreholes for gas drainage in small-angle coal seams in large-section tunnels. 【Background technique】 [0002] The construction of tunnels crossing gas-fired coal-measure strata occurs from time to time in the construction of highway traffic in mountainous areas in my country. The scientific design and safe construction of gas work areas are the controlling engineering of tunnel construction, which plays a vital role in the safety and reliability of tunnels. effect. According to the relevant national guidelines, the "four-in-one" gas prevention and control measures must be strictly implemented when the tunnel passes through the gas work area, and the tunnel excavation construction can only continue after the inspection indicators meet the standards. At present, most of the tunnel gas control methods follow the mine gas control measures, that is...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a large-section tunnel through small angle coal seam gas drainage drilling arrangement method to solve the problem of low coal seam gas drainage efficiency in the prior art

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