Improved calculation model for the size of crushed zone around blasthole

Leng Zhen-dong; Lu Wen-bo; Chen Ming; Yan Peng; Hu Ying-guo

doi:10.11883/1001-1455(2015)01-0101-07

Volume 35 Issue 1

Feb. 2015

Turn off MathJax

Article Contents

Article Navigation > Explosion And Shock Waves > 2015 > 35(1): 101-107

Leng Zhen-dong, Lu Wen-bo, Chen Ming, Yan Peng, Hu Ying-guo. Improved calculation model for the size of crushed zone around blasthole[J]. Explosion And Shock Waves, 2015, 35(1): 101-107. doi: 10.11883/1001-1455(2015)01-0101-07

Citation:

Leng Zhen-dong, Lu Wen-bo, Chen Ming, Yan Peng, Hu Ying-guo. Improved calculation model for the size of crushed zone around blasthole[J]. Explosion And Shock Waves, 2015, 35(1): 101-107. doi: 10.11883/1001-1455(2015)01-0101-07

Citation:

PDF( 1159 KB)

Improved calculation model for the size of crushed zone around blasthole

doi: 10.11883/1001-1455(2015)01-0101-07

Leng Zhen-dong^{1, 2},
Lu Wen-bo^{1, 2
,
,},
Chen Ming^{1, 2},
Yan Peng^{1, 2},
Hu Ying-guo^{1, 2}

1.
State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, Hubei, China
2.
Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering Ministry of Education, Wuhan University, Wuhan 430072, Hubei, China

Received Date: 2013-05-03
Rev Recd Date: 2013-07-25
Publish Date: 2015-01-25

Abstract

Abstract

To explore the breakage mechanism of rocks around the blasthole and to accurately predict the size of the crushed zone in drilling and blasting, an improved calculation model for calculation the size of the crushed zone was presented. The four-region model was established with hoop compressive stress in the inner part of fractured zone and cavity expansion effect taken into account. The material in the crushed zone is assumed to be granular medium without cohesion but with internal friction. On this basis, the formula for the crushed zone radius in drilling blasting is derived by elastic-plastic mechanics theory. The analysis shows that the size of the crushed zone ranges from 1.2 to 5.0 times of the blasthole radius, and there are notable discrepancies among rock types. Compared with other models, the improved model is in better agreement with the experiment data.
- mechanics of explosion,
- calculation model,
- hoop stress,
- crushed zone,
- improvement,
- cavity expansion

FullText(HTML)

References(20)

References

[1]	Melnikov N V. Influence of explosive charge design on results of blasting[C]//International Symposium on Mining Research. Clark G B. London, Pergamon, 1962: 147-155.
[2]	朱红兵, 卢文波, 吴亮.空气间隔装药爆破机理研究[J].岩土力学, 2007, 28(5): 986-989. http://d.wanfangdata.com.cn/Periodical/ytlx200705025 Zhu Hong-bing, Lu Wen-bo, Wu Liang. Research on mechanism of air-decking technique in bench blasting[J]. Chinese Journal of Rock and Soil Mechanics, 2007, 28(5): 986-989. http://d.wanfangdata.com.cn/Periodical/ytlx200705025
[3]	王明洋, 邓宏见, 钱七虎.岩石中侵彻与爆炸作用的近区问题研究[J].岩石力学与工程学报, 2005, 24(16): 2859-2863. http://www.cnki.com.cn/Article/CJFDTotal-YSLX200516009.htm Wang Ming-yang, Deng Hong-jian, Qian Qi-hu. Study on problems of near cavity of penetration and explosion in rock[J]. Chinese Journal of Rock Mechanics and Engineering, 2005, 24(16): 2859-2863. http://www.cnki.com.cn/Article/CJFDTotal-YSLX200516009.htm
[4]	Jimeno E L, Carcedo F J A. Drilling and blasting of rocks[M]. Taylor & Francis Group, 1995.
[5]	Ouchterlony F, Moser P. On the branching-merging mechanism during dynamic crack growth as a major source of fines in rock blasting[C]//The 10th International Symposium on Rock Fragmentation by Blasting. New Delhi, India, 2012: 65-75.
[6]	钱七虎.岩石爆炸动力学的若干进展[J].岩石力学与工程学报, 2009, 28(10): 1945-1968. http://d.wanfangdata.com.cn/Periodical/yslxygcxb200910001 Qian Qi-hu. Some advances in rock blasting dynamics[J]. Chinese Journal of Rock Mechanics and Engineering, 2009, 28(10): 1945-1968. http://d.wanfangdata.com.cn/Periodical/yslxygcxb200910001
[7]	Szuladzinski G. Response of rock medium to explosive borehole pressure[C]//Proceedings of the Fourth International Symposium on Rock Fragmentation by Blasting-Fragblast-4. Vienna, Austria, 1993: 17-23.
[8]	Djordjevic N. A two-component of blast fragmentation[C]//Proceedings of the Sixth International Symposium on Rock Fragmentation by Blasting-Fragblast. Johannesburg, South Africa, 1999: 213-222.
[9]	Hustrulid W A. Blasting principles for open pit mining-Theoretical foundations[M]. Rotterdam: Balkema, 1999.
[10]	Vovk A A, Mikhalyuk A V, Belinskii I V. Development of fracture zones in rocks during camouflet blasting[J]. Journal of Mining Science, 1973, 9(4): 383-387. doi: 10.1007/BF02501169
[11]	Kanchibotla S S, Valery W, Morrell S. Modelling fines in blast fragmentation and its impact on crushing and grinding[C]//Proceedings of Explo'99-A Conference on Rock Breaking. Kalgoorlie, Australia, 1999: 137-181.
[12]	Esen S, Onederra I, Bilgin H A. Modelling the size of the crushed zone around a blast hole[J]. International Journal of Rock Mechanics and Mining Sciences, 2003, 40(4): 485-495. http://www.sciencedirect.com/science/article/pii/S1365160903000182
[13]	戴俊.岩石动力学特性与爆破理论[M].北京: 冶金工业出版社, 2002.
[14]	Hagan T N, Gibson I M. Lower blasthole pressures: A means of reducing costs when blasting rocks of low to moderate strength[J]. International Journal of Mining and Geological Engineering, 1988, 6(1): 1-13. doi: 10.1007/BF00881023
[15]	Ghosh A. Fractal and numerical models of explosive rock fragmentation[D]. Tucson: The University of Arizona, 1990.
[16]	Rakishev B, Rakisheva Z B. Basic characteristics of the stages of rock massif destruction by explosive crushing[C]//Asia-Pacific Symposium on Blasting Techniques. Kunming, China, 2011: 65-69.
[17]	亨利奇.爆炸动力学及其应用[M].熊建国, 等, 译.北京: 科学出版社, 1987.
[18]	杨善元.岩石爆破动力学基础[M].北京: 煤炭工业出版社, 1991.
[19]	Olsson M, Bergqvist I. Crack lengths from explosives in multiple hole blasting[C]//The Fifth International Symposium on Rock Fragmentation by Blasting. Montreal, Quebec, Canada, 1996: 187-191.
[20]	Slaughter S. Investigation of coal fines[R]. Internal Report, Julius Kruttschnitt Mineral Research Centre(JKMRC), Australia, 1991.