单向荷载下不耦合装药预裂爆破效果研究
Study on effect of decoupling charge pre-splitting blasting under unidirectional load
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摘要: 为研究预裂爆破效果与不耦合系数及单向荷载的关系,以某矿新设回采工作面的现场试验为背景,简化地应力为竖直方向上的单向荷载,运用LS-DYNA软件对直径为73、89、94、104、130 mm的炮孔进行预裂爆破数值模拟,分析了预裂爆破裂隙扩展过程、单向荷载对裂隙扩展的影响、预裂效果与不耦合系数的关系。结果表明:在垂直于炮孔轴向的单向荷载作用下,爆破粉碎区和主裂隙长度不受其影响,对尖端裂隙可实现裂纹二次扩展;不耦合装药系数在1.14~2.03时,形成粉碎区所耗能量低于爆炸总能量的20%;综合炸药能量利用率和预裂效果,不耦合系数取1.63左右时,预裂效果最佳。Abstract: To study the relationship between the pre-splitting blasting effect and the decoupling coefficient and unidirectional load, based on the field test of a new mining face in a mine, the ground stress was simplified as the unidirectional load in the vertical direction, and the LS-DYNA software was used to simulate blast holes with diameters of 73, 89, 94, 104, and 130 mm were carried out to simulate the pre-splitting blasting crack propagation process, the influence of unidirectional load on the crack propagation, the relationship between the presplitting effect and the decoupling coefficient. The study results show that under the action of a unidirectional load perpendicular to the axial direction of the blast hole, the blasting crushing zone and the length of the main crack are not affected by it, and the tip cracks can achieve secondary extension; when the decoupled coefficient is between 1.14 to 2.03, the energy consumed to form the crushing zone is less than 20% of the total explosion energy; the comprehensive explosive energy utilization rate and pre-splitting effect, the pre-splitting effect is best when the decoupling coefficient is near 1.63.
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[1] 周林生,樊克恭,刘军,等. 冲击地压工作面爆破卸压效果的数值模拟[J].山东科技大学学报(自然科学版),2005,24(4):77-80. ZHOU Linsheng, FAN Kegong, LIU Jun, et al. Numerical simulation of the effect on pressure relief by blasting in working face with rock burst[J]. Journal of Shandong University of Science and Technology (Natural Science), 2005, 24(4): 77-80.
[2] 费鸿禄,洪陈超.应力波和爆生气体共同作用下裂隙区范围研究[J].爆破,2017,34(1):33-36. FEI Honglu, HONG Chenchao. Study on crushed and fracture zone range under combined action of stress and detonation gas[J]. Blasting, 2017, 34(1): 33-36.
[3] 张旭进.水平深孔超前预裂爆破技术研究及应用[D].太原:太原理工大学,2019. [4] 王洋洋.水平节理岩体爆破理论研究与数值分析[D].石家庄:石家庄铁道大学,2014. [5] 徐颖,孟益平,程玉生.装药不耦合系数对爆破裂纹控制的试验研究[J].岩石力学与工程学报,2002,21(12):1843-1847. XU Ying, MENG Yiping, CHENG Yusheng. Study on control of blast crack by decoupling charge index[J]. Chinese Journal of Rock Mechanics and Engineering, 2002, 21(12): 1843-1847.
[6] 谭元军,陈继府.空气间隔径向不耦合装药条件下柱状药包的破岩机理研究[J].爆破,2011,28(1):58. TAN Yuanjun, CHEN Jifu. Theory research of powder destroying with cylinder charge in rock under the condition of air interval decoupling charge along diameter[J]. Blasting, 2011, 28(1): 58.
[7] G W Ma, X M An. Numerical simulation of blasting-ind-uced rock fractures[J]. International Journal of Rock Mechanics & Mining Sciences, 2008, 45: 966. [8] 闫国斌,于亚伦. 空气与水介质不耦合装药爆破数值模拟[J].工程爆破,2009,15(4):13-19. YAN Guobin, YU Yalun. Numerical simulation of air and water medium decoupling charge blasting[J]. Engineering Blasting, 2009, 15(4): 13-19.
[9] 袁光英,王庆国.不耦合装药爆破效应数值分析[J]. 陕西理工学院学报(自然科学版),2013,29(5):28. YUAN Guangying, WANG Qingguo. Numerical analysis on decoupling charge blasting effect[J]. Journal of Shaanxi University of Technology(Natural Science Edition), 2013, 29(5): 28.
[10] 吕志强.钻屑法检验深孔爆破卸压技术效果[J].煤炭技术,2014,33(12):32-34. LYU Zhiqiang. Drilling cuttings method tests pressure releasing technique that effects of deep-hole blasting[J]. Coal Technology, 2014, 33(12): 32-34.
[11] 孙学笃,秦广鹏,曹民远.基于瞬变电磁法卸压深孔爆破效果研究[J].煤炭技术,2017,36(5):148-150. SUN Xuedu, QIN Guangpeng, CAO Minyuan. Study on deep hole blasting results of rock based on TEM[J]. Coal Technology, 2017, 36(5): 148-150.
[12] 戴俊.柱状装药爆破的岩石压碎圈与裂隙圈计算[J].辽宁工程技术大学学报(自然科学版),2001,20(2):144-147. DAI Jun. Calculation of radii of the broken and cracked areas in rock by a long charge explosion[J]. Journal of Liaoning Technical University(Natural Science), 2001, 20(2): 144-147.
[13] 姜鹏飞,唐德高,龙源.不耦合装药爆破对硬岩应力场影响的数值分析[J].岩土力学,2009,30(1):275. JIANG Pengfei, TANG Degao, LONG Yuan. Numerical analysis of influence of uncoupled explosive-charge structure on stress field in hard rocks[J]. Rock and Soil Mechanics, 2009, 30(1): 275.
[14] 程康,苏微倩,张桂涛,等.空气间隔装药技术周边孔间距对爆破效果的研究[J].爆破,2011,28(4):15. CHENG Kang, SU Weiqian, ZHANG Guitao, et al. Analysis on influence of contour boreholes space with air-decked charge on smooth blasting effect[J]. Blasting, 2011, 28(4): 15.
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