基于采动岩体裂隙发育规律的放顶煤采空区瓦斯治理模式
Goaf Gas Control Model for Top Coal Caving Based on Development Laws of Mining-induced Rock Fractures
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摘要: 为研究采动岩体垮落后综采放顶煤采空区瓦斯治理模式，基于采动岩体裂隙发育规律的重要性，针对某矿E1310综放工作面，采用MATLAB研究了采动岩体孔隙率和渗透率的分布规律，采用FLUENT数值模拟软件研究了4种通风方式、6个高抽巷抽采位置和41种抽采负压中最合理的采空区瓦斯治理模式。结果表明：“Y”型通风方式，上隅角瓦斯浓度为3%；高抽巷布置在距底板50 m、距回风巷50 m，上隅角瓦斯浓度降至0.5%；抽采负压为1.9 MPa，瓦斯不超限，工作面氧气浓度为22%。Abstract: To study the goaf gas control model of top coal caving after the collapse of mining-induced rock, based on the importance of the development laws of mining-induced rock fractures, in the view of E1310 fully-mechanized caving working face, the distribution of porosity and permeability of mining-induced rock was studied by using MATLAB. The most reasonable goaf gas control mode including 4 kinds of ventilation way, 6 extraction positions of high drainage roadway and 41 kinds of extraction negative pressure was studied by the numeral simulation software of FLUENT. The results show that the gas concentration at upper corner is 3% when it uses "Y" ventilation way. The gas concentration at upper corner dropped to 0.5% when high drainage roadway layouts in the 50 m away from floor and 50 m away from return airway. Gas is not overrun and the oxygen concentration is 22% at working face when the extraction negative pressure is 1.9 MPa.
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Keywords:
- mining-induced fractured rock mass /
- top coal caving /
- goaf /
- gas control model /
- numeral simulation
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