A stepwise construction method of dominant gas migration channel in coal seam stope

Abstract

A step-by-step construction method of dominant gas migration channels in coal seam stopes, especially suitable for the step-by-step construction of gas migration channels inside and outside coal rocks in the first mining layer stope of deep coal seam groups. First, rely on the mining action of the first mining layer to initially form a gas migration channel in the stope; then, through the construction of deep entry retaining, the method of maintaining stability and the method of artificially guided pre-splitting drilling, the advantages are formed in the external space and interior of the coal and rock mass. Gas migration channel; Finally, under the action of mining stress, an interconnected stope dominant gas migration channel system is further formed. The present invention combines the mining stress action with the manual active method, realizes the stepwise construction of stope gas migration channels in the first mining layer of the deep coal seam group "region-part-region", and solves the problem of gas migration in the deep coal seam stope Difficulty in channel formation and difficulty in efficient flow and enrichment of gas is conducive to the centralized diversion and treatment of gas, and has a wide range of application values.

Description

technical field [0001] The invention relates to a step-by-step construction method of a dominant gas migration channel in a coal seam stope, which is especially suitable for the step-by-step construction of the internal and external gas migration channels in the first mining layer of a deep coal seam group. Background technique [0002] my country's coal mining has gradually entered the era of deep well mining. After the mining of the first mining layer of the deep coal seam group, the mining gas in the layer and the pressure relief gas from the adjacent coal seam flood into the mining space, and the gas problem is becoming more and more serious. The applicability of the traditional U-shaped ventilation method is reduced, and it is difficult to form a dominant air flow system. At the same time, with the increase of mining depth, the stress in the deep coal seam increases, the deformation of the roadway is serious, and it is difficult to construct the deep roadway. Advantageo...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a scientific and effective coal seam stope dominant gas migration channel ladder construction method that can effectively solve the problems of large gas, poor flow and difficult flow diversion in the first mining layer of deep coal seam groups. The internal and external spaces are respectively constructed to form advantageous gas migration channels, forming an interconnected stope dominant gas migration channel system, realizing the advantageous migration and efficient enrichment of stope gas, thus laying the foundation for comprehensive diversion management of stope gas

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