孔内双点起爆条件下的爆炸能量传输与破岩效果分析

doi:10.13722/j.cnki.jrme.2019.0474

Abstract
Figure/Table
References (0)
Related Citation (15)

Download: PDF (732 KB) HTML (1 KB)
Export: BibTeX | EndNote (RIS)

Abstract In the process of rock fragmentation by blasting，the initiation mode has an important influence on the energy transmission and rock-breaking effect. The accumulated energy effect by collision of two oppositely traveling in-hole detonation waves was proved theoretically，and the energy transmission characteristics under the condition of dual initiation were analysed. The rock-breaking scopes under different initiation modes were calculated adopting a tension and compression-shear statistical damage model，and the fragmentation size distributions under different initiation modes were also investigated by comparing the field test results of bench blasting. The results show that when the two in-hole detonation waves collide in the middle of the borehole，the pressure near the collision point is greater than the sum of the strength of the two detonation waves and the local rock fragmentation degree is significantly improved. Under the condition of dual initiation，the volumes of tension and compression-shear failure zones of rock mass near the borehole are larger than those of bottom，top or middle initiation. When the initiation point position of in-hole dual initiation is changed，the volume of the compression-shear failure zone changes little but the volume of the tension failure zone changes obviously. Therefore，through reasonably designing the location and quantity of the initiation points，the spatial distribution of explosion energy can be adjusted by the collision of detonation wave and shock wave to improve the fragmentation degree of local rock and to meet different engineering requirements.

Key words： mechanics of explosion rock blasting dual initiation shock and detonation wave collision explosion energy transmission

	Service

	E-mail this article
	Add to my bookshelf
	Add to citation manager
	E-mail Alert
	RSS
	Articles by authors
	LENG Zhendong1
	2
	FAN Yong1
	LU Wenbo3
	GAO Qidong3
	ZHOU Junru3

Cite this article:

LENG Zhendong1,2,FAN Yong1, et al. Explosion energy transmission and rock-breaking effect of in-hole dual initiation[J]. , 2019, 38(12): 2451-2462.

URL:

http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2019.0474 OR http://www.rockmech.org/EN/Y2019/V38/I12/2451

[15]	COOPER P W. Explosives engineering[M]. [S. l.]：Wiley & Sons，1996：202-204.
[4]	ZHANG Z X. Effect of double-primer placement on rock fracture and ore recovery[J]. International Journal of Rock Mechanics and Mining Sciences，2014，71：208-216.
[10]	STARFIELD A. Strain wave theory in rock blasting[C]// The Eighth Rock Mechanics Symposium. Minneapolis，Minnesota：[s. n.]，1996：538-548.
[6]	LIU L，CHEN M，LU W B，et al. Effect of the location of the detonation initiation point for bench blasting[J]. Shock and Vibration，2015，(6)：1-11.
[3]	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.
[13]	LIU L，KATSABANIS P D. A numerical study of the effects of accurate timing on rock fragmentation[J]. International Journal of Rock Mechanics and Mining Sciences，1997，34(5)：817-835.
[16]	LIN S C. Cylindrical shock waves produced by instantaneous energy release[J]. Journal of Applied Physics，1954，25(1)：54-57.
[23]	郑炳旭. 经山寺铁矿优化开采综合爆破技术[J]. 岩石力学与工程学报，2012，31(8)：1 530-1 536.(ZHENG Bingxu. Multiple blasting techniques for exploitation optimizing of Jinshan Temple iron mine[J]. Chinese Journal of Rock Mechanics and Engineering，2012，31(8)：1 530-1 536.(in Chinese))
[1]	GAO Q D，LU W B，YAN P，et al. Effect of initiation location on distribution and utilization of explosion energy during rock blasting[J]. Bulletin of Engineering Geology and the Environment，2018，(7)：1-15.
[11]	CHIAPPETTA R F. Precision detonators and their applications in improving fragmentation，reducing ground vibrations and increasing reliability—a look into the future. Blasting technology[C]// Proceeding of the 4th High Tech Seminar Blasting Technology Instrumentation and Explosives Applications. Tennessee：[s. n.]，1992：1-26.
[14]	冷振东，卢文波，范勇，等. 侧向起爆条件下的爆炸能量分布及其对破岩效果的影响[J]. 爆炸与冲击，2017，37(4)：661-669. (LENG Zhendong，LU Wenbo，FAN Yong，et al. Explosion energy distribution by side initiation and its effects on rock fragmentation[J]. Explosion and Shock Waves，2017，37(4)：661-669.(in Chinese))
[21]	刘亮，卢文波，陈明，等. 钻爆开挖条件下岩体临界破碎状态的损伤阈值统计研究[J]. 岩石力学与工程学报，2016，35(6)：1 133-1 140. (LIU Liang，LU Wenbo，CHEN Ming，et al. Statistic damage threshold of critical broken rock mass under blasting load[J]. Chinese Journal of Rock Mechanics and Engineering，2016，35(6)：1 133-1 140.(in Chinese))
[24]	吴发名，刘勇林，李洪涛，等. 基于原生节理统计和爆破裂纹模拟的堆石料块度分布预测[J]. 岩石力学与工程学报，2017，36(6)：1 341-1 352.(WU Faming，LIU Yonglin，LI Hongtao，et al. Fragmentation distribution prediction of rockfill materials based on primary joint?s statistics and blasting crack?s simulation[J]. Chinese Journal of Rock Mechanics and Engineering，2017，36(6)：1 341-1 352. (in Chinese))
[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.(in Chinese))
[19]	曹文贵，方祖烈. 岩石损伤软化统计本构模型之研究[J]. 岩石力学与工程学报，1998，17(6)：628-633.(CAO Wengui，FANG Zhulie. A study of statistical constitutive model for soft and damage rocks[J]. Chinese Journal of Rock Mechanics and Engineering，1998，17(6)：628-633.(in Chinese))
[2]	周传波，谷任国，罗学东. 坚硬岩石一次爆破成井掏槽方式的数值模拟研究[J]. 岩石力学与工程学报，2005，24(13)：2 298-2 303. (ZHOU Chuanbo，GU Renguo，LUO Xuedong. Numerical simulation on cutting mode of shaft excavation by one-step deep-hole blasting in hard rock[J]. Chinese Journal of Rock Mechanics and Engineering，2005，24(13)：2 298-2 303.(in Chinese))
[5]	龚敏，黎剑华. 延长药包不同位置起爆时的应力场[J]. 北京科技大学学报，2002，24(3)：248-253.(GONG Min，LI Jianhua. A research on stress field of column and strip-shaped charge in different detonated points[J]. Journal of University of Science and Technology Beijing，2002，24(3)：248-253.(in Chinese))
[7]	ONEDERRA I A，FURTNEY J K，SELLERS E，et al. Modelling blast induced damage from a fully coupled explosive charge[J]. International Journal of Rock Mechanics and Mining Sciences，2013，58：73-84.
[8]	向文飞，舒大强，朱传云. 起爆方式对条形药包爆炸应力场的影响分析[J]. 岩石力学与工程学报，2005，24(9)：1 624-1 628.(XIANG Wenfei，SHU Daqiang，ZHU Chuanyun. Impacts of detonating mode on blast stress field of linear explosive charge[J]. Chinese Journal of Rock Mechanics and Engineering，2005，24(9)：1 624-1 628.(in Chinese))
[12]	张世豪，韩晶，王华，等. 混凝土中多点同步爆炸能量聚集效应分析[J]. 爆破，2014，31(1)：19-24.(ZHANG Shihao，HAN Jing，WANG Hua，et al. Energy gathering effect of multi-point simultaneous explosion in concrete[J]. Blasting，2014，31(1)：19-24.(in Chinese))
[17]	杨建华，卢文波，胡英国，等. 隧洞开挖重复爆炸荷载作用下围岩累积损伤特性[J]. 岩土力学，2014，35(2)：511-518.(YANG Jianhua，LU Wenbo，HU Yingguo，et al. Accumulated damage in surrounding rocks due to repeated blasting loads during blasting excavation of tunnels[J]. Rock and Soil Mechanics，2014，35(2)：511-518.(in Chinese))
[18]	XIE L X，LU W B，ZHANG Q B，et al. Damage evolution mechanisms of rock in deep tunnels induced by cut blasting[J]. Tunnelling and Underground Space Technology，2016，58：257-270.
[20]	CLAYTON J D. A model for deformation and fragmentation in crushable brittle solids[J]. International Journal of Impact Engineering，2008，35(5)：269-289.
[22]	冷振东，卢文波，刘博文，等. 深孔梯段爆破中含不同坚硬程度岩层的控制爆破方法[P]. 中国：CN201410414296.1，2014-08-21. (LENG Zhendong，LU Wenbo，LIU Bowen，et al. Controlled blasting method for deep hole bench blasting with different hardness strata[P]. China：CN201410414296.1，2014-08-21.(in Chinese))