Study on technique for controlling gas abnormal effusing of working face for coal seam poor in gas under extremely intensive mining condition

doi:10.16265/j.cnki.issn1003-3033.2017.01.013

Abstract

Abstract: In order to solve the problems of sudden increase in gas emission during coal cutting, the amount of gas emission continues to increase in goaf, and gas exceeding seriously at the upper corner under "U" type ventilation in the working face for coal seam poor in gas under extremely intensive mining condition. Tashan coal mine was taken as an example, and experiments were carried out to study the inhibition effect of coal seam water injection on gas emission during the fall of coal. A combined control technique for tnm-staging evacuation in the dedicated gas roadway of goaf was developed. The results show that the sudden increase of gas emission can be controlled by using the technology of coal seam water injection during mining, that the maximum volume fraction of gas in return air can be lowered to 0.58%, that U+I-type ventilation of natural evacuation is established during incipient mining in dedicated gas roadway, and the share of windblown gas reaches 30 m³/min, and that the gas emission is raised to 40 m³/min through inclosed vacuum drainage during the middle and later periods of mining.The technology controlled gas density of working face under critical value 0.6% during mining time, which protected mining face with high efficiency and safety.

Key words: low content, ultrahigh strength, water injection technology for coal seam, gas roadway, closed drain

CLC Number:

X936

WANG Chunguang. Study on technique for controlling gas abnormal effusing of working face for coal seam poor in gas under extremely intensive mining condition[J]. China Safety Science Journal, 2017, 27(1): 71-76.

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