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

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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

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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

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References(20)

References

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