Gas control technology by static pressure water injection in borehole of Weijiadi coal mine

doi:10.16265/j.cnki.issn1003-3033.2023.S2.0014

Abstract

Abstract:

In order to reduce the concentration of gas and dust during the mining of the mining face, the 1st coal seam of the east 1100 mining face in the east 1 mining area of the Weijiadi coal mine was taken as the research object, and the gas and dust control test of coal seam by water injection was carried out. Static pressure water injection was adopted to inject water into the coal seam of the mining face, and the single-hole water injection volume was calculated to be 6.9 m³. The water injection time was 1.7 h, and the water injection position was set at about 16 m in front of the mining face. By measuring the moisture change of coal samples at different positions from the water injection borehole in the mining face, it was concluded that the infiltration radius of the water injection hole was about 10 m. The results show that water injection in the coal seam can not only reduce the average gas volume fraction in the return air flow but also control the gas desorption index and the maximum amount of drilling cuttings in the coal seam, and it can ensure a reasonable change of the gas volume fraction in the upper corner.

Key words: water injection in coal seam, borehole, gas control, mining face, dust fall, gas volume fraction

CLC Number:

X936

WEN Jiandong, LIU Xuan, LI Zuoquan, MIAO Zaiquan, WANG Beibei. Gas control technology by static pressure water injection in borehole of Weijiadi coal mine[J]. China Safety Science Journal, 2023, 33(S2): 60-64.

Figures/Tables 5

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注水状态	日期	时间	瓦斯探头检测平均体积分数/%
未注水	2023-03-08	0:00—8:00	0.255
	2023-03-09	16:00—00:00	0.249
	2023-03-10	8:00—16:00	0.232
	2023-03-11	8:00—16:00	0.255
	2023-03-12	16:00—00:00	0.257
注水	2023-03-09	8:00—16:00	0.161
	2023-03-10	16:00—00:00	0.178
	2023-03-11	0:00—8:00	0.173
	2023-03-12	0:00—8:00	0.161
	2023-03-13	8:00—16:00	0.172

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