Coal seam stope advantageous gas transport pathway staged construction method

Abstract

The invention discloses a coal seam stope advantageous gas transport pathway staged construction method, particularly suitable for step-by-step construction of deep coal seam group first mining layer stope coal and rock mass inside-outside gas transport pathways. The method comprises the steps of firstly forming a gas transport pathway is preliminarily in a stope by mining action of first mining layer mining; then actively constructing in an outer space and an inner part of a coal and rock mass to form advantageous gas transport pathways by a deep entry retaining construction and stabilization method and a manual guide presplitting drilling method; finally, under the action of mining stress, further forming mutually communicated stope advantageous gas transport pathway systems. The mining stress action and a manual active method are combined to realize step-by-step construction of deep coal seam group area-local-area stope gas transport pathways, the problems that deep coal seam stope gas transport pathways are difficult to form, and efficient flowing and enrichment of gas is difficult to realize are solved, concentrated flow guide governance on the gas is facilitated, and the method has wide application value.

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

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