Influence of charge structures on the slotted cartridge blasting effect

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (10) : 27-34.

YUE Zhongwen，ZHANG Shichun，QIU Peng，LI Zhanfei，YUAN Kai

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Abstract

A new testing system of digital laser dynamic caustics, combined with a numerical simulation analysis, was adopted to comparatively analyze the impact dynamic behaviors of slotted cartridges and the dynamic mechanical behaviors of explosive cracks when the coupling charge and uncoupled charge fitted in slotted pipe interior were used. The results show that slotted cartridges can realize obvious directional fracturecontrolled blasting, the propagation form of explosive main crack is dominated by the tensile fracture mode，and the wedge effect of explosive gas is an important driving force for the continuous expansion of crack. There are four minor cracks presented in a “x” cross shape with a certain angle to the slot direction and a tiny dense fissure area around borehole because of the impact effect of slotted pipe and transmitted pressure wave on borehole wall, and a greater angle and more fissures will be presented on coupling charge structures than on uncoupled charge structures. For uncoupled charge structures, the propagation distance of explosive main crack is longer, and the crack expansion velocity and dynamic stress intensity factor are larger. The numerical simulation results indicate that uncoupled charge structures reduce the impact effect of detonation wave on borehole wall and strengthen the quasi static effect of explosive gas. Compared with coupling charge structures uncoupled charge structures can increase the stress concentration of the specimen in slot direction and improve the fracture mechanics parameters of the main explosive crack.

Key words

slotted cartridge / charge structure / dynamic caustics / numerical simulation / crack propagation

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YUE Zhongwen，ZHANG Shichun，QIU Peng，LI Zhanfei，YUAN Kai. Influence of charge structures on the slotted cartridge blasting effect[J]. Journal of Vibration and Shock, 2018, 37(10): 27-34

References

[1] 罗勇，沈兆武. 切缝药包岩石定向断裂爆破的研究[J]. 振动与冲击，2006，25(4)：155-158.
LUO Yong, SHEN Zhaowu. Study on rock directional fracture blasting of Slotted cartridge[J]. Journal of Vibration and Shock, 2006, 25(4): 155-158.
[2] 姜琳琳．切缝药包定向断裂爆破机理与应用研究[D]．北京：中国矿业大学，2010．
JIANG Linlin. Mechanism and applicational of directional fracture blasting with slotted cartridge[D].Beijing: China University of Ming and Technology, 2010.
[3] 张志雄，郭银领，李林峰. 切缝药包爆破裂纹扩展机理研究[J].工程爆破，2007，13(2)：11-14.
ZHANG Zhixiong, GUO Yinling, LI Linfeng, et al. Study on mechanism of crack growth of cutting seam cartridge blating[J]. Engineering Blasting, 2007, 13(2): 11-14.
[4] 张志呈，肖正学，胡健. 岩石断裂控制爆破切缝药管的参数研究[J]. 化工矿物与加工，2006，35(11)：15-18.
ZHANG Zhichen, XIAO Zhengxue, HU Jian, et al. Study on slotted pipe parameters in rock fracture controlled blasting[J]. IM&P, 2006, 35(11): 15-18
[5] Langefors U. The modern technique of rock blasting[M]. Swe-den:Almqvist&Wiksells, 1983.
[6] 李显寅，蒲传金，肖定军．论切缝药包爆破的剪应力作用[J]. 爆破，2009，26(1)：19-21.
LI Xianyan, PU Chuanjin, XIAO Dingjun, et al. Discussion on shear stress of cutting seam cartridge blasting[J]. Blasting, 2009, 26(1): 19-21.
[7] 肖正学，陆渝生，张志程，等. 切缝药包聚能效应的动光弹试验[J]. 解放军理工大学学报：自然科学版，2005，6(5)：447-450.
XIAO Zhengxue, LU Yusheng, ZHANG Zhichen, et al. Dynamic photoelasticity experiment on energy cumulative effect of slit charge [J]. Journal of PLA University of Science and Technology, 2005, 6(5): 447-450.
[8] Wang Y. Study of the dynamic fracture effect using slottedcartridge decoupling charge blasting[J]. International Journal of Rock Mechanics and Mining Sciences, 2017, 96: 34-46.
[9] 高祥涛. 切缝药包爆轰冲击动力学行为研究[D]. 北京：中国矿业大学 (北京), 2013.
GAO Xiangtao. Detonation shock dynamic behavior of split-tube charge holder[D].Beijing: China University of Ming and Technology, 2013.
[10] 魏晨慧，万成，白羽，等. 不同地应力条件下切缝药包爆破的数值模拟[J]. 爆炸与冲击，2016，36(2)：161-169.
WEI CHenhui, WAN Cheng, BAI Yu, et al. Dynamic photoelasticity experiment on energy cumulative effect of slit charge [J]. Explosion and Shock Waves, 2016, 36(2): 161-169.
[11] 杨仁树，许鹏，杨立云等. 缺陷介质切槽爆破断裂行为的动焦散线实验[J]. 爆炸与冲击，2016，36(2)：145-152.
YANG Renshu，XU Peng，YANG Liyun，et al. Caustics experimental study of the fracture behavior of defective media with notched blasting[J]. EXPLOSION AND SHOCK WAVES，2016，36 (2)：145-152.
[12] 岳中文，郭洋，王煦等. 起爆时差对孔间裂纹扩展影响的动焦散实验研究[J]. 岩石力学与工程学报，2015，34(11)：2293-2300.
YUE Zhongwen，GUO Yang，WANG Xu，et al. Dynamic caustics study of influence of delayeded initiation on crack propagation between boreholes[J]. Chinese Journal of Rock Mechanics and Engineering，2015，34 (11)：2293-2300.
[13] 杨仁树，丁晨曦，杨立云，等．节理对爆生裂纹扩展影响的试验研究[J]．振动与冲击，2017，36(10)：26-30．
YANG Renshu, DING Chenxi, YANG Liyun, et al. Experimental study on the effects of joints on the blasting induced cracks propagation[J]. Journal of Vibration and Shock, 2017, 36 (10): 26-30.
[14] 岳中文，宋耀，邱鹏，等．冲击载荷下双预置裂纹三点弯曲梁动态断裂实验[J]．振动与冲击，2017，36(4)：151-156.
YUE Zhongwen, SONG Yao, QIU Peng, et al. A dynamic fracture experiment of a three-point-bend beam containing double pre-existing cracks under impact load[J]. Journal of Vibration and Shock, 2017, 36 (4): 151-156.
[15] 李清，梁媛，任可可，等. 聚能药卷的爆炸裂纹定向扩展过程试验研究[J]. 岩石力学与工程学报，2010，29(8)：1684-1689.
LI Qing, LIANG Yuan, REN Keke, et al. Experimental study of propagation of directional cracks with shaped charge under blasting load[J]. Chinese Journal of Rock Mechanics and Engineering, 2010, 29 (8): 1684-1689.
[16] Murphy N, Ali M, Ivankovic A. Dynamic crack bifurcation in PMMA[J]. Engineering fracture mechanics, 2006, 73(16): 2569-2587.
[17] Yue Z W, Yang L Y, Wang Y B. Experimental study of crack propagation in polymenthyl methacrylate material with double holes udder the directional controlled blasting[J]. Fatigue & Fracture of Engineering Materials & Structures, 2013, 36(8): 827-833.
[18] 岳中文，邱鹏，王煦，等．切槽孔掏槽爆破机理动态焦散线实验研究[J]．煤炭学报，2016，41(04)：858-863．
YUE Zhongwen, QIU Peng, WANG Xu, et al. Notched borehole cut blasting study by the method of dynamic caustics[J]. Journal of China Coal Society, 2016, 41 (04): 858-863.
[19] Papadopoulos G A. Fracture mechanics: the experimental method of caustics and the Det.-criterion of fracture[M]. New York: Springer, 1992: 134–204.
[20] Livermore Software Technology Corporation. LS-DYNA keyword user’s manual version 971[M]. Livermore, C A, USA: Livermore Software Technology Corporation, 2007.