Stepped-type construction method for preferential gas migration passage of coal seam stope

摘要

Disclosed is a stepped-type construction method for a preferential gas migration passage of a coal seam stope, particularly applicable to gradual construction of a gas migration passage inside and outside stope coal and rock mass of a deep coal seam group first mining layer (1). Firstly, depending on the mining action of the first mining layer (1) mining, a gas migration passage is initially formed at the stope; then a preferential gas migration passage is respectively actively constructed and formed at an outside space and an inside space of the coal and rock mass by means of a deep entry retaining construction and stability maintenance method, and a manually guided pre-splitting and drilling method; and finally under the action of the mining force, further forming mutually communicating stope preferential gas migration passage systems. Through the combination of the action of the mining force and a manual active method, stepped-type construction of a "region-local area-region" stope gas migration passage for a deep coal seam group first mining layer (1) is achieved, solving the difficulty of forming a deep coal seam stope gas migration passage, and the difficulty of high efficiency flow enrichment of gas, aiding in centralised diversion governance of gas, and having widespread application value.