Gas control method for large-mining-height working face of high gas coal seam

Abstract

The invention provides a gas control method for a large-mining-height working face of a high gas coal seam, and belongs to the technical field of safety of mines. The gas control method comprises the steps of arranging a first bed extraction tunnel during excavating at the working face; upwards arranging a crossing hole through the first bed extraction tunnel to pre-extract gas; arranging and cutting holes in the bed extraction tunnel to pre-extract gas; arranging an inclined connection roadway to form a ventilation circuit; arranging a second bed extraction tunnel and a connection roadway; pre-extracting gas through the crossing hole which is upwards arranged through the first bed extraction tunnel; arranging a high extraction tunnel to reach a gob caving slit band; arranging the crossing hole in the high extraction tunnel; pumping gas at the high extraction tunnel. According to the gas control method for the large-mining-height working face of the high gas coal seam, gas pumping drilling holes are arranged in each tunnel, a gas treatment scheme under the combination of the bed extraction tunnel, the high extraction tunnel and the current coal seam extraction is created, and therefore, the gas emission rate in the excavating and recovery periods at the working face can be effectively reduced, the continuing speed of recovery at the working face is raised, the gas accumulated at the working face and upper corners and ultralimit of gas can be effectively avoided, and as a result, the safety in production at the working face can be ensured.

Description

technical field [0001] The invention belongs to the technical field of coal mine safety, in particular to a gas control method for a high-gas coal seam and a large mining height working face. Background technique [0002] For the high-gas coal seam and large mining height working face, the original gas content in the working face is high, and during the rapid excavation of the working face, gas exceeding the limit or even gas disaster accidents are prone to occur; in addition, during the mining period of the working face, the roof is affected by Under the influence of mining, deformation, subsidence and caving will occur, and then a larger goaf will be formed. The development height of the fissure will increase significantly, and the scope of communication with adjacent layers will be large. A large amount of gas is accumulated, and under the action of the concentration differential pressure, the gas in the goaf will flow to the working face again, and at the same time, it w...

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Problems solved by technology

[0006] However, after using the existing gas control method to control the gas in the high-gas coal seam working face with large mining height, it is found that the gas emission of the working face is still large during the excavation and mining, and the gas in the working face cannot reach the standard for a long time, and the working face is recovered. Continuation of tension

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