基于采空区瓦斯运移规律的抽采钻场设计

为了对高瓦斯工作面采空区抽采钻场进行设计，使采空区及工作面上隅角瓦斯得到有效控制，通过数值模拟分析了采场覆岩结构及裂隙发育规律；根据模拟结果利用实验室试验分析了抽采钻孔在不同位置时采空区瓦斯的运移规律，得出终孔位置距煤层顶板上方30m左右，距回风巷水平距离10～20m时抽采效果最佳；且终孔高度应根据工作面覆岩结构形态有所区别，靠近回风巷的钻孔高度应控制在规则冒落带上部，靠近工作面中部的钻孔应布置在裂隙带内。

Design on Borehole Drilling Site for Mine Gas Drainage Based on Gas Migration Features in Goaf

In order to conduct a design on a borehole drilling site for the mine gas drainage from the goaf of the high gassy coal mining face and to effectively control the gas at the top corner of the goaf and the top corner of the coal mining face,the numerical simulation was applied to study the overburden strata structures and the fracturing development law of the coal mining face.According to the simulation results,the lab experiments were applied to analyze the gas migration features of the gas drainage boreholes in different location of the goaf.The borehole terminal location measured had a distance about 30 m in the roof above seam.When the borehole terminal location had a horizontal distance of 10~20 m to the air returning gateway,the gas drainage effect would be best.The borehole terminal height would be different based on the overburden strata structure above the coal mining face.The borehole height near the air returning gateway should be controlled above the regular falling zone.The borehole near the middle of the coal mining face should be set in the cracking zone.