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| EXPERIMENTAL STUDY OF REGULARITY OF CRACK PROPAGATION UNDER BLASTING DYNAMIC LOADS |
| HU Rong1，2，ZHU Zheming1，2，HU Zheyuan1，2，KANG Jiming1，2 |
| (1. College of Architecture and Environment，Sichuan University，Chengdu，Sichuan 610065，China；2. Key Laboratory of Minstry of Education for Energy Engineering Safety and Disaster Mechanics，Sichuan University，Chengdu，Sichuan 610065，China) |
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Abstract In order to investigate the regularity of crack propagation under blasting dynamic loads，polymethyl methacrylate(PMMA) plates are employed to make samples containing a single crack and a borehole. The borehole is designed along the quadrant of a circle centered at one crack tip with radius of 60 mm. A detonator inside the borehole is fired to produce dynamic stress waves. The effects of incident angles of stress waves on crack initiation angles and propagation angles have been studied experimentally. The results show that：(1) As incident angle is 0°，crack initiation angle is 0°，i.e. the cracks propagate along the crack surface plane；(2) As incident angle is greater than 15° and less than 75°，wing-cracks occur along the pre-existing crack tips；(3) The wing-crack property is related to the incident angle of stress waves；(4) As incident angle is greater than 75°，new developed cracks are very small.
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Received: 05 November 2012
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| [1] 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.
[2] ZHU Z M，XIE H P，MOHANTY B. Numerical investigation of blasting-induced damage in cylindrical rocks[J]. International Journal of Rock Mechanics and Mining Sciences，2008，45(2)：111–121.
[3] ZHU Z M. Numerical prediction of crater blasting and bench blasting[J]. International Journal of Rock Mechanics and Mining Sciences，2009，46(6)：1 088–1 096.
[4] ZHOU Z T，ZHU Z M，JIN X X，et al. Numerical prediction of rock fracturing during the process of excavation[J]. International Journal of Geotechnical Earthquake Engineering，2010，1(2)：12–23.
[5] LI Y X，ZHU Z M，LI B X，et al. Study on the transmission and reflection of stress waves across joints[J]. International Journal of Rock Mechanics and Mining Sciences，2011，48(3)：364–371.
[6] LI Y X，ZHU Z M. Study on the velocity of P waves across a single joint based on fractal and damage theory[J]. Engineering Geology，2012，151：82–88.
[7] 朱哲明，李元鑫，周志荣，等. 缺陷岩体在爆炸荷载下的动态响应[J]. 岩石力学与工程学报，2011，30(6)：1 157–1 167.(ZHU Zheming，LI Yuanxin，ZHOU Zhirong，et al. The response of defected rock under blasting loads[J]. Chinese Journal of Rock Mechanics and Engineering，2011，30(6)：1 157–1 167.(in Chinese))
[8] PARK D，JEON B，JEON S. A numerical study on the screening of blast-induced waves for reducing ground vibration[J]. Rock Mechanics and Rock Engineering，2009，42(3)：449–473.
[9] 徐则民，黄润秋. 岩爆与爆破的关系[J]. 岩石力学与工程学报，2003，22(3)：414–419.(XU Zemin，HUANG Runqiu. Relationship between rock burst and blasting[J]. Chinese Journal Rock Mechanics and Engineering，2003，22(3)：414–419.(in Chinese))
[10] LOEBER J F，SIH G C. Diffraction of antiplane shear waves by a finite crack[J]. Acoustical Society of America，1968，44(1)：90–98.
[11] LOEBER J F，SIH G C. Wave propagation in an elastic solid with a line of discontinuity of finite crack[J]. Quarterly of Applied Mathematics，1969，27(2)：711–721.
[12] 阿肯巴赫. 弹性固体中波的传播[M]. 徐植信，洪锦如译. 上海：同济大学出版社，1992：370–386.(AKEN Bahe. Wave transmission in elastic solid[M]. Translated by XU Zhixing，HONG Jinru. Shanghai：Tongji University Press，1992：370–386.(in Chinese))
[13] HARRIS J G. Diffraction by a crack of a cylindrical longitudinal pulse[J]. Journal of Applied Mathematics and Physics，1980，31(3)：367–383.
[14] ROSSMANITH H P，DAEHNKE A，KNASMILLNER R E K，et al. Fracture mechanics applications to drilling and blasting[J]. Fatigue and Fracture Engineering Materials and Structures，1997，20(11)： 1 617–1 636.
[15] 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.(XIAO Tongshe，YANG Renshu，BIAN Yadong，et al. Dynamic caustics model experiment of blasting crack propagating on joint rock[J]. Journal of Experimental Mechanics，2006，21(4)：539–545.(in Chinese))
[16] 岳中文，杨仁树，郭东明，等. 爆炸应力波作用下缺陷介质裂纹扩展的动态分析[J]. 岩土力学，2009，30(4)：949–954.(YUE Zhongwen，YANG Renshu，GUO Dongming，et al. Dynamic analysis of crack propagation in media containing flaws under the explosive stress wave[J]. Rock and Soil Mechanics，2009，30(4)：949–954.(in Chinese))
[17] 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.(YANG Renshu，YUE Zhongwen，XIAO Tongshe，et al. Dynamic caustics experiment on crack propagation of joined medium fracture with controlled blasting[J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(2)：244–250.(in Chinese))
[18] 李 清，张 茜，李晟源，等. 爆炸应力波作用下分支裂纹动态力学特性实验[J]. 岩土力学，2011，32(10)：3 026–3 032.(LI Qing，ZHANG Xi，LI Shengyuan，et al. Experimental study of dynamic fracture behaviors of branched cracks under blasting stress wave[J]. Rock and Soil Mechanics，2011，32(10)：3 026–3 032.(in Chinese)) |
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2013, Vol. 32 
