Dynamic stress analysis and application for gas drainage through strata by presplitting blasting
Deep-hole pre-splitting blasting technology is recently applied to gas drainage through strata for increasing drainage rate in coal mine.At the background of the underground engineering practice, this study is to combine the 3-D numerical simulation with field test of drainage.Relations between dynamic stress distribution of each borehole and drainage effect after explosion are discussed.Layouts of control holes and blasting holes are analyzed according to the characteristics of gas drainage through strata.Mathematical models of deep-hole presplitting blasting through strata are established.As a blasting hole is oriented crossing a seam with an angle, dynamic stress distribution of different coal seam sections are extremely uneven;charge length of blast holes is an important factor affecting their radial extent of damage, while destruction radius increases 33% when the charge length increased 73%.The dynamic stress of the center control hole is the biggest to other control holes.The average of gas drainage volume in blasting holes is 55% larger than that of control holes.
M.Gong B.Wen H.Wang F.W.Zhang
University of Science and Technology Beijing, Beijing, China Chongqing Energy Investment Group, Chongqing, China
国际会议
The 3rd ISRM Young Scholars Symposium on Rock Mechanics(第三届国际岩石力学青年学者论坛)
北京
英文
669-674
2014-11-08（万方平台首次上网日期，不代表论文的发表时间）