Effect of two parallel cracks on main propagating cracks under blasting

WAN Duanying; ZHU Zheming; LIU Ruifeng; LIU Bang

doi:10.11883/bzycj-2019-0008

Volume 39 Issue 8

Aug. 2019

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WAN Duanying, ZHU Zheming, LIU Ruifeng, LIU Bang. Effect of two parallel cracks on main propagating cracks under blasting[J]. Explosion And Shock Waves, 2019, 39(8): 083105. doi: 10.11883/bzycj-2019-0008

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WAN Duanying, ZHU Zheming, LIU Ruifeng, LIU Bang. Effect of two parallel cracks on main propagating cracks under blasting[J]. Explosion And Shock Waves, 2019, 39(8): 083105. doi: 10.11883/bzycj-2019-0008

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Effect of two parallel cracks on main propagating cracks under blasting

doi: 10.11883/bzycj-2019-0008

WAN Duanying^{1, 2
,},
ZHU Zheming^{1, 2
,
,},
LIU Ruifeng^{1, 2},
LIU Bang^{1, 2}

1.
MOE Key Laboratory of Deep Earth Science and Engineering, Sichuan University, Chengdu 610065, Sichuan, China
2.
College of Architecture and Environment, Sichuan University, Chengdu 610065, Sichuan, China

Received Date: 2019-01-11
Rev Recd Date: 2019-02-25

Available Online: 2019-07-25

Publish Date: 2019-08-01

Abstract

Abstract

There are many cracks inside the rock mass. In this paper, taking a pair of parallel cracks as an example, we studied the effect of two parallel cracks on the main crack’s propagation behavior and investigated the relationship of the main crack’s extended length with the two parallel cracks’ spacing, using experiment and numerical simulation. In our experiments, we used a circular sandstone specimen including a center hole charged with a detonator and pre-existing cracks and a test system consisting of an oscilloscope, an ultra-dynamic strain amplifier and crack propagation gauges (CPGs), and monitored the propagation velocity and length of the main crack. In our simulation we used the AUTODYN code to investigate the propagation behavior of the main crack and the two parallel cracks. We described the state of the rock material using the linear equation of state and the maximum tensile stress failure criteria, and designed some target points between the two parallel cracks to record the stress history. The experiments and numerical simulation show that the compressive stress perpendicular to the direction of the main crack occurs between the two parallel cracks under explosive loading; that, as a result of just following the shock waves and encountering the parallel crack surfaces, the rarefactional waves change into compressive waves, thus leading to the confinement of the propagating cracks; and that this compressive stress is related to the spacing between the two parallel cracks, and leads to differences in the main crack’s confinement, propagation velocity, and eventual propagation length.
- explosive stress wave,
- crack propagation,
- crack arrest,
- parallel cracks

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References(26)

References

[1]	ZHU Z M, XIE H P, MOHANTY B. Numerical of blasting-induced damage in cylindrical rocks [J]. International Journal of Rock Mechanics and Mining Sciences, 2008, 45(2): 111–121. DOI: 10.1016/j.ijrmms.2007.04.012.
[2]	ZHU Z M. Numerical prediction of crater blasting and bench blasting [J]. International Journal of Rock Mechanics and Mining Sciences, 2009, 46(6): 1088–1096. DOI: 10.1016/j.ijrmms.2009.05.009.
[3]	FOURNEY W L, DICK R D, SIMHA K R Y. Model study of crater blasting [J]. Rock Mechanics and Rock Engineering, 1988, 21(3): 183–205. DOI: 10.1007/BF01032579.
[4]	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. DOI: 10.1016/j.ijrmms.2018.01.043.
[5]	LIU C, YANG J, YU B. Rock-breaking mechanism and experimental analysis of confined blasting of borehole surrounding rock [J]. International Journal of Mining Science and Technology, 2017, 27(5): 795–801. DOI: 10.1016/j.ijmst.2017.07.016.
[6]	LI C R, KANG L J, QI Q X, et al. The numerical analysis of borehole blasting and application in coal mine roof-weaken [J]. Procedia Earth and Planetary Science, 2009, 1(1): 451–459. DOI: 10.1016/j.proeps.2009.09.072.
[7]	YILMAZ O, UNLU T. Three dimensional numerical rock damage analysis under blasting load [J]. Tunnelling and Underground Space Technology Incorporating Trenchless Technology Research, 2013, 38(9): 266–278. DOI: 10.1016/j.tust.2013.07.007.
[8]	岳中文, 杨仁树. 爆炸载荷下裂纹扩展方向预测的研究 [J]. 实验力学, 2010, 25(4): 408–414. DOI: 1001-4888(2010)04-0408-07. YUE Zhongwen, YANG Renshu. Study of crack propagation direction prediction of explosion loading [J]. Journal of Experimental Mechanics, 2010, 25(4): 408–414. DOI: 1001-4888(2010)04-0408-07.
[9]	刘瑞峰, 朱哲明, 李盟, 等. 爆炸载荷下Ⅰ型裂纹的起裂及扩展规律研究 [J]. 岩石力学与工程学报, 2018, 37(2): 392–402. DOI: 10.13722/j.cnki.jrme.2017.1126. LIU Ruifeng, ZHU Zheming, LI Meng, et al. Initiation and propagation of mode I crack under blasting [J]. Chinese Journal of Rock Mechanics and Engineering, 2018, 37(2): 392–402. DOI: 10.13722/j.cnki.jrme.2017.1126.
[10]	杨仁树, 岳中文, 肖同社, 等. 节理介质断裂控制爆破裂纹扩展的动焦散试验研究 [J]. 岩石力学与工程学报, 2008, 27(2): 244–250. DOI: 10.3321/j.issn:1000-6915.2008.02.003. YANG Renshu, YUE Zhongwen, XIAO Tongshe, et al. Dynamic caustics experiment on crack propagation of jointed medium fracture with controlled blasting [J]. Chinese Journal of Rock Mechanics and Engineering, 2008, 27(2): 244–250. DOI: 10.3321/j.issn:1000-6915.2008.02.003.
[11]	岳中文, 郭洋, 王煦. 切槽孔爆炸载荷下裂纹扩展行为的实验研究 [J]. 岩石力学与工程学报, 2015, 34(10): 2018–2026. DOI: 10.13722/j.cnki.jrme.2015.0497. YUE Zhongwen, GUO Yang, WANG Xu. Experimental study of crack propagation under blasting load in notched boreholes [J]. Chinese Journal of Rock Mechanics and Engineering, 2015, 34(10): 2018–2026. DOI: 10.13722/j.cnki.jrme.2015.0497.
[12]	ZHU Z M, MOHANTY B, XIE H P. Numerical investigation of blasting-induced crack initiation and propagation in rocks [J]. International Journal of Rock Mechanics and Mining Sciences, 2007, 44(3): 412–424. DOI: 10.1016/j.ijrmms.2006.09.002.
[13]	朱哲明, 李元鑫, 周志荣, 等. 爆炸荷载下缺陷岩体的动态响应 [J]. 岩石力学与工程学报, 2011, 30(6): 1157–1167. DOI: 1000-6915(2011)06-1157-11. ZHU Zheming, LI Yuanxin, ZHOU Zhirong, et al. Dynamic response of defected rock under blasting load [J]. Chinese Journal of Rock Mechanics and Engineering, 2011, 30(6): 1157–1167. DOI: 1000-6915(2011)06-1157-11.
[14]	WANG Z L, KONIETZKY H, SHEN R F. Coupled finite element and discrete element method for underground blast in faulted rock masses [J]. Soil Dynamics and Earthquake Engineering, 2009, 29(6): 939–945. DOI: 10.1016/j.soildyn.2008.11.002.
[15]	YI C, JOHANSSON D, GREBERG J. Effects of in-situ stresses on the fracturing of rock by blasting [J]. Computers and Geotechnics, 2018, 104: 321–330. DOI: 10.1016/j.compgeo.2017.12.004.
[16]	张玉柱, 卢文波, 陈明, 等. 爆炸应力波驱动的岩石开裂机制 [J]. 岩石力学与工程学报, 2014, 33(S1): 3144–3149. DOI: 1000-6915(2014)S1-3144-06. ZHANG Yuzhu, LU Wenbo, CHEN Ming, et al. Rock cracking mechanism driven by explosive stress wave [J]. Chinese Journal of Rock Mechanics and Engineering, 2014, 33(S1): 3144–3149. DOI: 1000-6915(2014)S1-3144-06.
[17]	钟波波, 李宏, 张永彬. 爆炸荷载作用下岩石动态裂纹扩展的数值模拟 [J]. 爆炸与冲击, 2016, 36(8): 825–831. DOI: 10.11883/1001-1455(2016)06-0825-07. ZHONG Bobo, LI Hong, ZHANG Yongbin. Numerical simulation of dynamic cracks propagation of rock under blasting loading [J]. Explosion and Shock Waves, 2016, 36(8): 825–831. DOI: 10.11883/1001-1455(2016)06-0825-07.
[18]	YU L, SU H, JING H, et al. Experimental study of the mechanical behavior of sandstone affected by blasting [J]. International Journal of Rock Mechanics and Mining Sciences, 2017, 93: 234–241. DOI: 10.1016/j.ijrmms.2017.02.002.
[19]	HE C, YANG J, YU Q. Laboratory study on the dynamic response of rock under blast loading with active confining pressure [J]. International Journal of Rock Mechanics and Mining Sciences, 2018, 102: 101–108. DOI: 10.1016/j.ijrmms.2018.01.011.
[20]	朱振海. 爆炸应力波对高速扩展裂纹影响的动态光弹性试验研究 [J]. 爆炸与冲击, 1993, 13(2): 178–185. ZHU Zhenhai. Dynamic photoelastic investigations of the effect of explosive stress waves on an extending-high speed crack [J]. Explosion and Shock Waves, 1993, 13(2): 178–185.
[21]	杨仁树, 陈程, 岳中文, 等. 正入射爆炸应力波与运动裂纹作用的动态光弹性实验研究 [J]. 煤炭学报, 2018, 43(1): 87–94. DOI: 10.13225/j.cnki.jccs.2017.0353. YANG Renshu, CHEN Cheng, YUE Zhongwen, et al. Dynamic photoelastic investigation of interaction of normal incidence blasting stress waves with running cracks [J]. Journal of China Coal Society, 2018, 43(1): 87–94. DOI: 10.13225/j.cnki.jccs.2017.0353.
[22]	郭东明, 闫鹏洋, 杨仁树, 等. 爆破开挖中巷道围岩缺陷扩展的动焦散模型试验研究 [J]. 采矿与安全工程学报, 2015, 32(5): 728–734. DOI: 10.13545/j.cnki.jmse.2015.05.005. GUO Dongming, YAN Pengyang, YANG Renshu, et al. Dynamic caustic model experimental study on the defects extension of roadway surrounding rock when blasting excavation [J]. Journal of Mining and Safety Engneering, 2015, 32(5): 728–734. DOI: 10.13545/j.cnki.jmse.2015.05.005.
[23]	肖同社, 杨仁树, 边亚东, 等. 含节理岩体爆生裂纹扩展的动焦散模型实验研究 [J]. 实验力学, 2006, 21(4): 539–545. DOI: 10.3969/j.issn.1001-4888.2006.04.020. XIAO Tongshe, YANG Renshu, BIAN Yadong, et al. Dynamic caustics mode experiment of blasting crack propagating on joint rock [J]. Journal of Experimental Mechanics, 2006, 21(4): 539–545. DOI: 10.3969/j.issn.1001-4888.2006.04.020.
[24]	RAVI-CHANDAR K, KNAUSS W G. An experimental investigation into dynamic fracture: on the interaction of stress waves with propagating cracks [J]. International Journal of Fracture, 1984, 26(3): 189–200. DOI: 10.1007/BF01140627.
[25]	胡荣, 朱哲明, 胡哲源, 等. 爆炸动载荷下裂纹扩展规律的实验研究 [J]. 岩石力学与工程学报, 2013, 32(7): 1476–1481. DOI: 10.3969/j.issn.1000-6915.2013.07.024. HU Rong, ZHU Zheming, HU Zheyuan, et al. Experimental study of regularity of crack propagation under blasting dynamic loads [J]. Chinese Journal of Rock Mechanics and Engineering, 2013, 32(7): 1476–1481. DOI: 10.3969/j.issn.1000-6915.2013.07.024.
[26]	褚怀保, 杨小林, 侯爱军, 等. 煤体中爆炸应力波传播与衰减规律模拟实验研究 [J]. 爆炸与冲击, 2012, 32(2): 244–250. DOI: 10.11883/1001-1455(2012)02-0185-05. CHU Huaibao, YANG Xiaolin, HOU Aijun, et al. A simulation-based experimental study on explosion stress wave propagation and attenuation in coal [J]. Explosion and Shock Waves, 2012, 32(2): 244–250. DOI: 10.11883/1001-1455(2012)02-0185-05.