Fine numerical simulation of row-hole blasting in tunnel excavation

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (11) : 154-162.

GUAN Zhenchang1, ZHU Lingfeng1, YU Bolin2

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Abstract

Here, aiming at common surrounding rock conditions and blast hole types in tunnel blasting excavation, five kinds of blast hole fine models were established on LS-DYNA numerical platform, and the fluid-structure interaction algorithm was used to simulate the transient process of row-hole blasting.Firstly, the pressure crushing zone was formed instantly around blast hole, and the initial crack was continuously expanded due to action of air wedge to form the surrounding rock fracture zone.Then the detonation pressure wave was reflected at free face, and its reflected tensile wave made a large range of parallel cracks appear on surrounding rock near free face.Finally, radii of the crushing zone and fracture zone were about 3-4 times and 22-24 times of blast hole radius, respectively.The pressure time history curve on the boundary of blast hole crushing zone received attention, it was shown that obvious multi-peak form including the first peak, the second one and negative one appear; the main peak value and the axial decoupling coefficient have a power exponential decay relationship; if averaging peak pressures on blasting contours, the simplified triangle shape load on each blasting contour can be obtained, it can be applied in the following work, such as, far-field vibration effect evaluation.

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row-hole blasting / fluid-solid interaction / fine numerical simulation / crack propagation / pressure time history curve

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GUAN Zhenchang1, ZHU Lingfeng1, YU Bolin2. Fine numerical simulation of row-hole blasting in tunnel excavation[J]. Journal of Vibration and Shock, 2021, 40(11): 154-162

References

［1］李铮, 何川, 汪波, 等.城市隧道穿越复合地层的合理微差时间间隔［J］.爆炸与冲击, 2016, 36(1): 93-100.
LI Zheng, HE Chuan, WANG Bo, et al.Optimal microsecond time interval of urban tunnel passing through complex strata［J］.Explosion and Shock Waves, 2016, 36(1): 93-100.
［2］许红涛, 卢文波, 邹奕芳.钻孔爆破中环向裂纹形成机理的研究［J］.工程爆破, 2003, 9(3): 7-11.
XU Hongtao, LU Wenbo, ZOU Yifang.Study on the mechanism of the formation of circumferential cracks in drilling-and-blasting［J］.Engineering Blasting, 2003, 9(3): 7-11.
［3］刘达, 卢文波, 陈明, 等.隧洞钻爆开挖爆破振动主频衰减公式研究［J］.岩石力学与工程学报, 2018, 37(9): 2015-2026.
LIU Da, LU Wenbo, CHEN Ming, et al.Atten uation formula of the dominant frequency of blasting vibration during tunnel excavation［J］.Chinese Journal of Rock Mechanics and Engineering, 2018, 37(9): 2015-2026.
［4］YANG R S, DING C X, YANG L Y, et al.Study of decoupled charge blasting based on high-speed digital image correlation method［J］.Tunnelling and Underground Space Technology, 2019, 83: 51-59.
［5］李清, 于强, 朱各勇, 等.不同药量的切缝药包双孔爆破裂纹扩展规律试验［J］.岩石力学与工程学报, 2017, 36(9): 2205-2212.
LI Qing, YU Qiang, ZHU Geyong, et al.Experimental study of crack propagation under two-hole slotted cartridge blasting with different amounts of charge［J］.Chinese Journal of Rock Mechanics and Engineering, 2017, 36(9): 2205-2212.
［6］LI M, ZHU Z M, LIU R F, et al.Study of the effect of empty holes on propagating cracks under blasting loads［J］.International Journal of Rock Mechanics and Mining Sciences, 2018, 103: 186-194.
［7］林发展, 陈培煌, 刘四德, 等.钻爆法施工中单孔爆破的精细化数值模拟［J］.工程爆破, 2017, 23(6): 11-16.
LIN Fazhan, CHEN Peihuang, LIU Side, et al.Refined numerical simulation for the single-hole blasting in the drilling and blasting excavation［J］.Engineering Blasting, 2017, 23(6): 11-16.
［8］WEI X Y, ZHAO Z Y, GU J.Numerical simulations of rock mass damage induced by underground explosion［J］.International Journal of Rock Mechanics and Mining Sciences, 2009, 46(7): 1206-1213.
［9］高启栋, 卢文波, 冷振东, 等.隧洞开挖过程中掏槽孔起爆位置的优选［J］.振动与冲击, 2018, 37(9): 8-16.
GAO Qidong, LU Wenbo, LENG Zhendong, et al.Optimization of cut-hole’s detonating position in tunnel excavation［J］.Journal of Vibration and Shock, 2018, 37(9): 8-16.
［10］YI C P, JOHANSSON D, GREBERG J.Effects of in-situ stresses on the fracturing of rock by blasting［J］.Computers and Geotechnics, 2018, 104: 321-330.
［11］钟冬望, 何理, 操鹏, 等.爆破振动持时分析及微差爆破延期时间优选［J］.爆炸与冲击, 2016, 36(5): 703-709.
ZHONG Dongwang, HE Li, CAO Peng, et al.Analysis of blasting vibration duration and optimizing of delayed time interval for millisecond blasting［J］.Explosion and Shock Waves, 2016, 36(5): 703-709.
［12］史秀志, 邱贤阳, 周健, 等.超大断面高天井短微差类球状药包爆破成井技术与工程实例［J］.岩石力学与工程学报, 2016, 35(8): 1659-1667.
SHI Xiuzhi, QIU Xianyang, ZHOU Jian, et al.Technology and case study of ultra-large section and high shaft excavation by short-millisecond spherical blasting［J］.Chinese Journal of Rock Mechanics and Engineering, 2016, 35(8): 1659-1667.
［13］Livermore Software Technology Corporation.LS-DYNA keyword user’s manual version 971［M］.Livermore: Livermore Software Technology Corporation, 2007.
［14］工程地质手册编委会.工程地质手册［M］.4版.北京：中国建筑工业出版社, 2007.
［15］福州市规划设计研究院.福州市福马路提升改造工程（鼓山隧道）详细勘察阶段岩土工程勘察报告［R］.福州: 福州市规划设计研究院, 2017.
［16］夏祥, 李海波, 李俊如, 等.岩体爆生裂纹的数值模拟［J］.岩土力学, 2006, 27(11): 1987-1991.
XIA Xiang, LI Haibo, LI Junru, et al.Numerical simulation of blast-induced cracks in rock［J］.Rock and Soil Mechanics, 2006, 27(11): 1987-1991.
［17］李夕兵．岩石冲击动力学［M］．长沙：中南工业大学出版社，1994．
［18］刘优平, 龚敏, 黄刚海.深孔爆破装药结构优选数值分析方法及其应用［J］.岩土力学, 2012, 33(6): 1883-1888.
LIU Youping, GONG Min, HUANG Ganghai.Numerical analysis method for optimizing charging structure of deep-hole blasting and its application［J］.Rock and Soil Mechanics, 2012, 33(6): 1883-1888.
［19］贾磊, 解咏平, 李慎奎.爆破振动对邻近隧道衬砌安全的数值模拟分析［J］.振动与冲击, 2015, 34(11): 173-177.
JIA Lei, XIE Yongping, LI Shenkui.Numerical simulation for impact of blasting vibration on nearby tunnel lining safety［J］.Journal of Vibration and Shock, 2015, 34(11): 173-177.
［20］许红涛, 卢文波, 周小恒.爆破震动场动力有限元模拟中爆破荷载的等效施加方法［J］.武汉大学学报(工学版), 2008, 41(1): 67-71.
XU Hongtao, LU Wenbo, ZHOU Xiaoheng.An equivalent approach for acting blasting load in dynamic finite element simulation of blasting vibration［J］.Engineering Journal of Wuhan University, 2008, 41(1): 67-71.