采空区瓦斯抽放钻孔终孔范围确定方法研究.pdfVIP

39 5 Vol39 No5 2011 5 CoalScience and Technology M ay 2011 1, 2 1, 2 1, 2 1, 2 1, 2 1, 2 赵勇明 , 蒋曙光 , 邵 昊 , 刘 彬 , 韩子维 , 迟洪有 ( 1 , 221008; 2 , 221116) : 为提高采空区瓦斯抽放效率, 通过对 岩采动裂隙椭抛带和 竖三带 理论的分析, 建 立了数学模型, 并分析了采空区瓦斯运移形态, 提出了采空区瓦斯抽放钻孔终孔应布置在内外抛椭 带之间, 同时也应位于该区域上 岩层的裂隙带下部及规则冒落带上部温庄矿采用此方法改造了 150301工作面采空区瓦斯抽放钻孔, 结果使瓦斯抽放量达到 72 3 / in, 且工作面风量由原来的 2 050 3 / in降低至 1 500 3 / in, 解决了上隅角瓦斯超限的难题, 保证了生产的正常进行 : 采空区; 瓦斯抽放; 椭抛带; 竖三带; 终孔范围 : TD7126 : A : 0253- 2336 ( 2011) 05- 0051- 03 Study on Determ ination M ethod of Borehole End Scope for Gas Drainage Borehole in Goaf 1, 2 1, 2 1, 2 1, 2 1, 2 1, 2 ZHAO Yong- ing , JIANG Shu-guang , SHAO Hao , LIU Bin , HAN Zi-wei , CHIHong-you ( 1. S tateK ey Lab of Coal R esources and Saf e ty M in ing, X uzhou 221008, Ch ina; 2. School of S af ety E ng ineering, Ch ina Un i ersity of M ining and T echnology, Xuzhou 221116, Ch ina) A bstrac t: In order to i prove the gas drainage efficiency in the goaf, w ith the analysis on the theory of the ellipticalparabolic zone and the vertical three zones, a athe atic odelwas established and the gas igration pattern in the goaf was analyzed. The paper pro- posed that borehole end of the gas drainageborehole in the goaf should be laid out at the location between the inner and outer of the ellipt-i cal parabolic zone and also should be located at the crack zone botto of the overburden strata and at the top of the nor al falling zone in that area. The ethodwas applied inW enzhuang M ine to reconstruct the gas drainage boreholes in the goaf ofNo150301 coal ining face. The results showed that