正明矿穿层钻孔有效抽放半径的研究

钻孔有效抽放半径是矿井瓦斯抽放措施中的一个重要参数,直接关系到抽放钻孔的设计、布置以及抽放时间的长短。以气体渗流理论通过fluent6.3建立了钻孔瓦斯抽放流动模型,来模拟在抽放钻孔周围瓦斯的运移规律,确定抽放半径大概范围。结合现场考察,采用SF6示踪法通过对数据的测定及分析,最终得出正明矿4#煤瓦斯抽放钻孔的有效抽放半径与抽放时间之间的关系,为瓦斯抽放钻孔的合理布置提供了科学依据。同时也为其他煤矿抽放半径的确定提供了参考依据。

Study on effective drainage radius of layer drilling at Zhengming mine

The effective drainage radius of drill hole is an important parameter in the mine gas drainage measures. It is directly related to the design of drainage borehole,arrangement and the length of drainage time. By using the numerical simulation software Fluent 6. 3 with the theory of gas flow,a flow model of borehole gas drainage was established to simulate the gas migration rule around the drainage borehole so as to determine the scope about drainage radius. Combing with on-site investigation,through the measurement and analysis on the data obtained by SF 6 tracer method,the relationship between the drainage time and the effective drainage of gas drainage borehole radius in the 4# coal seam of Zhengming mine was concluded. It provides a scientific basis for reasonable layout of gas drainage borehole,as well as a reference basis for the determination of other coal mine drainage radius.