Double-roadway arrangement non-pillar mining method for high-gas-burst coal seam

Abstract

The invention discloses a double-roadway arrangement non-pillar mining method for a high-gas-burst coal seam and belongs to the field of underground coal mine supporting and mining. The double-roadwayarrangement non-pillar mining method comprises the steps that an outer side roadway of a double-roadway tunneling working face is arranged outside a supporting pressure peak value area through a project analogy method or a stress monitoring method; during double-roadway tunneling, the length of a connection roadway between double roadways is 150-200 m, and thus the supporting cost is reduced; when the working face is stoped, gob-side entry retaining is conducted along the inner side roadway, air enters from two crossheading grooves of the working face, and the two crossheading grooves and theouter side roadway form a Y-shaped ventilation system; double-roadway tunneling of the next working face is also conducted through the method, and the air return roadway of the previous working faceis also turned into the air inlet roadway; and the steps are repeated, and high-gas-burst coal seam non-pillar mining of all the working faces is completed sequentially. By adopting the double-roadwayarrangement non-pillar mining method for the high-gas-burst coal seam, the roadway tunneling quantity can be decreased, the invalid roadway tunneling and outer side roadway supporting strength and cost are reduced, and non-pillar mining is achieved.

Description

technical field [0001] The invention relates to a coal pillar-free mining method, and is especially suitable for a coal-pillar-free mining method with double lane arrangement in a high-gas outburst coal seam used in underground mining. Background technique [0002] For a long time, the roadway excavation of high-gas outburst coal seam has been greatly affected by gas, which is the main factor restricting the rapid excavation of coal seam roadway, affecting production connection and safety. For a single coal seam with high gas outbursts, double-lane excavation is required for roadway excavation, which has a large amount of roadway construction, many excavation heads, large air volume, high outburst prevention pressure, high 10,000-ton excavation rate, excavation succession, and tight mine air volume. In addition, in order to prevent the gas from exceeding the limit in the corner of the working face, the "U+L" ventilation method was often used in the past, and the gas in the t...

AI Technical Summary

Problems solved by technology

For a single coal seam with high gas outburst, the roadway excavation needs to adopt double-lane excavation, which has a large amount of roadway construction, many excavation heads, large air volume, high outburst prevention pressure, high 10,000-ton excavation rate, excavation succession, and tight air volume in the mine

In addition, in order to prevent the gas from exceeding the limit in the corner of the working face, the "U+L" ventilation method was often used in the past, and the gas in the tail lane was processed through the goaf, which made it difficult to effectively control the gas. It is easy to cause the occurrence of gas and power failure in the working face

In addition, if the multi-lane layout is adopted, the loss of coal resources will be large, and the tail lane may be within the influence of mining, and the cost of roadway support and maintenance will be high

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