采空区瓦斯宏观流动通道的高位钻孔抽采技术

发布时间：2018-07-03 08:31

本文选题：瓦斯抽采 + 高位钻孔　；参考：《采矿与安全工程学报》2017年02期

【摘要】：采场顶板来压极易将采空区内瓦斯压出引发上隅角瓦斯超限甚至瓦斯爆炸。基于岩体的尺寸及时间效应分析了采空区瓦斯宏观流动通道的演化发育规律,应用离散元数值软件计算了顶板来压前后瓦斯宏观流动通道的变化,结合关键层理论研究了基于顶板来压影响及瓦斯宏观流动通道变化的高位抽采钻孔终孔位置、钻场间距及钻孔接续的确定方法及设计技术。结果表明:采空区基本顶载荷作用时间越长,垮断距越大,岩层裂隙越发育;顶板来压及接近来压时瓦斯宏观流动通道最为发育,贯通性最好,其水平裂隙宽度是来压前的3倍,最利于瓦斯抽采。现场应用来压时抽采效率提高约55%,避免了瓦斯超限。
[Abstract]:It is easy to press gas out of goaf by roof pressure in stope and cause gas overrun or even gas explosion in upper corner. Based on the size and time effect of rock mass, the evolution and development rule of gas macroscopic flow channel in goaf is analyzed, and the change of gas macroscopic flow channel before and after roof pressure is calculated by using discrete element numerical software. Based on the theory of key layer, the determination method and design technology of the final hole position, the spacing of drilling field and the continuity of boreholes in high mining based on the influence of roof pressure and the change of gas macroscopic flow channel are studied. The results show that the longer the action time of the basic top load in the goaf, the larger the fault gap, the more developed the rock fissure, and the more developed the gas macroscopic flow channel is when the roof pressure is coming and approaching the pressure, and the transfixibility is the best. The width of horizontal fissure is 3 times of that before pressure, which is most favorable for gas drainage. The site should be used to pressure drainage efficiency about 55 measures to avoid gas overrun.
【作者单位】：中国矿业大学(北京)资源与安全工程学院;
【基金】：国家重点研发计划项目(2016YFC0600708) 国家重点基础研究发展计划(973)项目(2011CB201204) 中央高校基本科研业务费专项资金项目(2011YZ05)
【分类号】：TD712.6

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