Experiment on slotted tube blasting of axial decoupling coefficient charging

Yang Guoliang; Cheng Shuaijie; Wang Ping; Li Xuehai; Yan Yugang

doi:10.11883/1001-1455(2017)01-0134-06

Volume 37 Issue 1

Jan. 2017

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Yang Guoliang, Cheng Shuaijie, Wang Ping, Li Xuehai, Yan Yugang. Experiment on slotted tube blasting of axial decoupling coefficient charging[J]. Explosion And Shock Waves, 2017, 37(1): 134-139. doi: 10.11883/1001-1455(2017)01-0134-06

Citation:

Yang Guoliang, Cheng Shuaijie, Wang Ping, Li Xuehai, Yan Yugang. Experiment on slotted tube blasting of axial decoupling coefficient charging[J]. Explosion And Shock Waves, 2017, 37(1): 134-139. doi: 10.11883/1001-1455(2017)01-0134-06

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Experiment on slotted tube blasting of axial decoupling coefficient charging

doi: 10.11883/1001-1455(2017)01-0134-06

State Key Lab of Geomechanics and Deep Underground Engineering, China University of Mining & Technology, Beijing 100083, China

Received Date: 2015-05-18
Rev Recd Date: 2015-09-17
Publish Date: 2017-01-25

Abstract

Abstract

In this work we performed experimental tests using the dynamic strain test and high speed photography system to study the mechanism of the air-deck slotted charging structure blasting, with four axial air-deck structures adopted. The results show that the highest strain ratio reached 2.1 as the axial decoupling coefficient 1.5, and the corresponding function time of pressure was 9 μs. The best result of directional fracture was achieved. The crack propagation process was recorded by high-speed photography, which show that the propagation speed of the crack was not a constant. The expansion speed of the crack fluctuated with time, and illustrated the phenomenon. Finally, the field tests were performed in the underground tunneling and open slope projects with 1.50 and 1.66 as the axial decoupling coefficient respectively, and with good results achieved.
- mechanics of explosion,
- axial decoupling coefficient,
- strain ratio,
- directional fracture blasting,
- slotted tube

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References(12)

References

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