无煤柱开采工作面采空区漏风及瓦斯运移特征

doi:10.16265/j.cnki.issn1003-3033.2024.11.1721

摘要/Abstract

摘要：

为掌握无煤柱开采Y型通风工作面不同回采时期采空区漏风及瓦斯运移特征,以晋能控股装备制造集团有限公司寺河煤矿2号井97312工作面为研究对象。采用六氟化硫(SF₆)示踪气体法分别测定与相邻97311工作面采空区不同连通状态下97312工作面及回采巷道的漏风区域分布、漏风类型和漏风量。利用数值模拟分析采空区内部漏风流场分布及瓦斯运移特征。结果表明:97312工作面沿风流方向依次形成正压—负压—正压—负压4段漏风区域;主进风巷97222巷为正压漏风;回风巷97224巷沿空留巷段主要为负压漏风,但在抽采管附近及巷道变形严重区域易形成正压漏风;与相邻采空区的连通状态对采空区内部漏风流场及瓦斯运移均有影响,采空区连通后,新增了1条漏风路径;97311采空区漏风流携带瓦斯向97312采空区运移,导致97312采空区、工作面及97224沿空留巷段处瓦斯体积分数升高;97311工作面封闭后,采空区连通段附近瓦斯体积分数降低。

关键词: 无煤柱, 工作面, 采空区漏风, 瓦斯运移, Y型通风, 沿空留巷, 采空区连通状态

Abstract:

To understand the characteristics of goaf air leakage and gas migration in different mining periods of Y-type ventilation working face without coal pillar mining, 97312 working face in Sihe No.2 coal mine of Jinneng Holding Equipment Manufacturing Group Co., Ltd. was selected. The sulfur hexafluoride (SF₆) tracer gas approach was used to determine the air leakage area distribution, air leakage type, and air leakage volume of 97312 working face and the roadways under different connectivity states with the adjacent 97311 working face goaf. The air leakage flow field distribution and gas migration characteristics in the goaf area were analyzed by numerical simulation. The results showed that 97312 working face had four air leakage areas of positive pressure-negative pressure-positive pressure-negative pressure along the wind direction. The main air intake roadway 97222 had positive pressure leakage. The air return roadway 97224 had mainly negative pressure air leakage along the gob-side entry retaining section, but positive pressure leakage was prone to occur near the extraction pipe and in the area where the roadway was severely deformed. After connectivity with the adjacent goaf area, an additional air leakage path was created. Moreover, the connection status with the adjacent goaf affected the internal air leakage flow field and gas migration of the goaf. Air leakage from the 97311 goaf area carried gas to the 97312 goaf, causing an increase in gas volume fraction in the 97312 goaf, working face, and the gob-side entry retaining section of the 97224 roadway. After the closure of the 97311 working face, the gas volume fraction near the connected goaf area decreased.

Key words: pillarless, coal mining face, air leakage in goaf, gas migration, Y-type ventilation, gob-side entry retaining, connection state of goaf

中图分类号:

X936

张遵国, 张宏虎, 唐朝, 袁新立, 陈永强. 无煤柱开采工作面采空区漏风及瓦斯运移特征[J]. 中国安全科学学报, 2024, 34(11): 119-130.

ZHANG Zunguo, ZHANG Honghu, TANG Chao, YUAN Xinli, CHEN Yongqiang. Characteristics of air leakage and gas migration in goaf of pillarless coal mining face[J]. China Safety Science Journal, 2024, 34(11): 119-130.

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97224巷	97224巷与97312面距离/m			n/%
	采空区连通前	采空区连通后	97311封闭后	n/%
	(0,150]	(0,200]	(0,200]	5
	(150,250]	(200,300]	(200,400]	6
	(250,280]	(300,330]	(400,600]	8
	(280,320]	(330,370]	(600,800]	12
97222巷	采空区连通后97222巷与 97311面距离/m	n/%	97311工作面封闭后 97222巷与97311面距离/m	n/%
	(0,300}	5	(0,100}	5
	(300,530}	4	(100,570}	1.5
	(530,570}	1.5	-	-

开采时期	几何名称	长×宽×高/(m×m×m)	几何名称	长×宽×高/(m×m×m)
采空区连通前	97222巷	50×5×2.6	97312采空区	320×215×40
	97224巷	370×5×2.6	顶板高位钻孔抽采孔	0.113×0.113
	97312工作面	220×5×1.65	采空区埋管抽采孔	0.457×0.457
采空区连通后	97222巷	580×5×2.6	97311采空区	570×175×40
	97224巷	470×5×2.6	97312采空区	370×215×40
	97311工作面	175×4×1.9	顶板高位抽采孔	0.113×0.113
	97312工作面	220×5×1.65	采空区埋管抽采孔	0.457×0.457
97311工作面封闭后	97222巷	150×5×2.6	97311采空区	570×170×40
	97224巷	860×5×2.6	97312采空区	800×215×40
	97311工作面	170×4×1.9	顶板高位抽采孔	0.113×0.113
	97312工作面	220×5×1.65	采空区埋管抽采孔	0.475×0.475

回采时期	97222巷进风量/ (m³·min^-1)	97224巷进风量/ (m³·min^-1)
采空区连通前	1 174	725
采空区连通后	1 664	628
97311工作面封闭后	1 252	1 205

开采时期	校验点	现场瓦斯体积分数	模拟瓦斯体积分数	误差
采空区连通前	97312工作面回风隅角	0.22~0.26	0.22~0.27	0.01
采空区连通前	97224巷尾	0.20	0.19	0.01
采空区连通后	97312工作面进风隅角	0.06~0.08	0.06~0.07	0.01
	97224巷胶带机头	0.04	0.04	0
	97224巷尾	0.20~0.38	0.20~0.34	0.04
97311工作面封闭后	97224巷沿空留巷段距离97312 工作面300m	0.20	0.25	0.05
97311工作面封闭后	97224巷沿空留巷段距离97312 工作面600m	0.30	0.27	0.03