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Hydraulic fracturing initiation and propaga鄄 tion. Chin J Rock Mech Eng, 2013, 32(Suppl 2): 3169 (冯彦军, 康红普. 水力压裂起裂与扩展分析. 岩石力学与工 程学报, 2013, 32(增刊 2): 3169) [5] Gong M, Liu W B, Wang D S, et al. Controlled blasting tech鄄 nique to improve gas pre鄄drainage effect in a coal mine. J Univ Sci Technol Beijing, 2006, 28(3): 223 (龚敏, 刘万波, 王德胜, 等. 提高煤矿瓦斯抽放效果的控制 爆破技术. 北京科技大学学报, 2006, 28(3): 223) [6] Cai F, Liu Z G, Zhang C J, et al. Numerical simulation of impro鄄 ving permeability by deep鄄hole presplitting explosion in loose鄄soft and low permeability coal seam. J China Coal Soc, 2007, 32(5): 499 (蔡峰, 刘泽功, 张朝举, 等. 高瓦斯低透气性煤层深孔预裂 爆破增透数值模拟. 煤炭学报, 2007, 32(5): 499) [7] Zhu W C, Wei C H, Li S, et al. Numerical modeling on destress blasting in coal seam for enhancing gas drainage. Int J Rock Mech Min Sci, 2013, 59: 179 [8] Lei Y, Liu J J, Zhang S N, et al. Contrast test of different perme鄄 ability improvement technologies for gas鄄rich low鄄permeability coal seams. 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Experimental study and applica鄄 tion of directional focused energy blasting in deep boreholes. Chin J Rock Mech Eng, 2014, 33(12): 2490 (刘健, 刘泽功, 高魁, 等. 深孔定向聚能爆破增透机制模拟 试验研究及现场应用. 岩石力学与工程学报, 2014, 33 (12): 2490) [14] Guo D Y, Zhao J C, L俟 P F, et al. Dynamic effects of deep鄄hole cumulative blasting in coal seam and its application. Chin J Eng, 2016, 38(12): 1681 (郭德勇, 赵杰超, 吕鹏飞, 等. 煤层深孔聚能爆破动力效应 分析与应用. 工程科学学报, 2016, 38(12): 1681) [15] Rollins R R, Ucar R. Nonsymmetrical decoupling / / 19th U S Symposium on Rock Mechanics. Lake Tahoe, 1978: 193 [16] Zong Q, Meng D J. Influence of different kinds of hole charging structure on explosion energy transmission. Chin J Rock Mech Eng, 2003, 22(4): 641 (宗琦, 孟德君. 炮孔不同装药结构对爆破能量影响的理论 探讨. 岩石力学与工程学报, 2003, 22(4): 641) [17] Liu Y P, Gong M, Huang G H. Numerical analysis method for optimizing charging structure of deep鄄hole blasting and its appli鄄 cation. 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Adv Appl Mech, 1962, 7: 55 ·1494·