Stereoscopic comprehensive pressure-relief gas drainage method suitable for extraction of soft rock protective layer

Abstract

The invention discloses a stereoscopic comprehensive pressure-relief gas drainage method suitable for extraction of a soft rock protective layer. The stereoscopic comprehensive pressure-relief gas drainage method comprises the steps of determining developing heights of roof and floor fissure zones after extraction of the soft rock protective layer according to cover rock structure characteristics in a stope; and determining construction conditions by analyzing specific zoning ranges of overlying and underlying protected seams. The stereoscopic comprehensive pressure-relief gas drainage method suitable for extraction of the soft rock protective layer puts forward an omnibearing stereoscopic comprehensive pressure-relief gas drainage method from overground to underground, from coal seam gas pre-extraction before mining, continuous pressure-relief gas drainage during mining to pressure-relief drainage strengthening after mining, so that effective linking and supplementing on the aspects of time, space and function are achieved; and various pressure-relief gas drainage measures are reasonably combined and fully used and mutually complement, so that relief-pressure gas drainage of protected seams is more reliable, reasonable, economical and effective.

Description

technical field [0001] The invention relates to a pressure-relieving gas drainage method for mining a protective layer, in particular to a three-dimensional comprehensive pressure-relieving gas drainage method suitable for mining a soft rock protective layer. Background technique [0002] As the mine extends to the deep, affected by the "three highs and one disturbance", the gas pressure and gas content in the deep coal seam are greater than those in the shallow coal seam, and it becomes more and more difficult to control mine gas, and the mining protection layer is a kind of Economical and effective regional gas control techniques have been proven by a large number of engineering practices. [0003] After entering the deep mining, the extension of mining is combined with complicated geological conditions, which leads to the upgrade of coal seams with no outburst risk or coal seams with less risk of outburst originally mined as protective layers to outburst coal seams or str...

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Problems solved by technology

[0003] After entering the deep mining, the extension of mining is combined with complicated geological conditions, which leads to the upgrade of coal seams with no outburst risk or coal seams with less risk of outburst originally mined as protective layers to outburst coal seams or strongly outburst coal seams, and the mining conditions of the protective layer are lost. It may be necessary to invest a large amount of drilling engineering to meet the conditions for mining the protective layer. The mining economic investment is large and the construction period is long, which causes the tension of mine excavation and seriously affects the economic benefits of the mine. Many mines are forced to choose to mine soft rock formations as the first mining. Regional Gas Control in Pressure Relief Layer

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