Analysis of empty hole effect in directional fracture controlled blasting

Yue Zhong-wen; Guo Yang; Xu Peng; Wang Xu; Song Yao

doi:10.11883/1001-1455-(2015)03-0304-08

Volume 35 Issue 3

Jun. 2015

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Yue Zhong-wen, Guo Yang, Xu Peng, Wang Xu, Song Yao. Analysis of empty hole effect in directional fracture controlled blasting[J]. Explosion And Shock Waves, 2015, 35(3): 304-311. doi: 10.11883/1001-1455-(2015)03-0304-08

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Yue Zhong-wen, Guo Yang, Xu Peng, Wang Xu, Song Yao. Analysis of empty hole effect in directional fracture controlled blasting[J]. Explosion And Shock Waves, 2015, 35(3): 304-311. doi: 10.11883/1001-1455-(2015)03-0304-08

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Analysis of empty hole effect in directional fracture controlled blasting

doi: 10.11883/1001-1455-(2015)03-0304-08

School of Mechanics & Civil Engineering, China University of Mining & Technology, Beijing 100083, China

Received Date: 2013-09-24
Rev Recd Date: 2014-01-06
Publish Date: 2015-05-25

Abstract

Abstract

A new experimental system of digital laser dynamic caustics was used and the distribution of dynamic stress field around empty holes and the influence of empty holes upon the main cracks expanding under the blasting loading were studied.Experimental results show that two blast-induced main cracks, which were oppositely expanding, deflected gradually to empty hole under the strong stress and penetrated empty hole.The angle between the principal stress direction and the line of two blasting holes center near the empty hole kept about 12°, and the principal stress direction did not change with the size of empty holes increasing; the interaction between explosive stress waves and empty holes produced reflective stretching waves, changed the stress field at the main crack tips, reduced expanding velocity of the main crack.The larger the diameter of empty hole was, the lower the main crack propagation velocity was.When the blast-induced main cracks expanded to empty hole, the dynamic stress intensity factor at crack tips appeared to rise again.
- mechanics of explosion,
- fracture controlled blasting,
- digital laser dynamic caustics,
- empty hole,
- blast-induced cracks

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References(13)

References

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