Interaction between blast stress waves and cracks

YANG Renshu; XU Peng; CHEN Cheng

doi:10.11883/bzycj-2018-0480

Volume 39 Issue 8

Aug. 2019

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YANG Renshu, XU Peng, CHEN Cheng. Interaction between blast stress waves and cracks[J]. Explosion And Shock Waves, 2019, 39(8): 081102. doi: 10.11883/bzycj-2018-0480

Citation:

YANG Renshu, XU Peng, CHEN Cheng. Interaction between blast stress waves and cracks[J]. Explosion And Shock Waves, 2019, 39(8): 081102. doi: 10.11883/bzycj-2018-0480

YANG Renshu, XU Peng, CHEN Cheng. Interaction between blast stress waves and cracks[J]. Explosion And Shock Waves, 2019, 39(8): 081102. doi: 10.11883/bzycj-2018-0480

Citation:

YANG Renshu, XU Peng, CHEN Cheng. Interaction between blast stress waves and cracks[J]. Explosion And Shock Waves, 2019, 39(8): 081102. doi: 10.11883/bzycj-2018-0480

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Interaction between blast stress waves and cracks

doi: 10.11883/bzycj-2018-0480

YANG Renshu^{1, 2
,},
XU Peng^{1, 3
,
,},
CHEN Cheng^{1, 3}

1.
China State Key Laboratory for Geomechanics & Deep Underground Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China
2.
Civil and Resource Engineering School, University of Science & Technology Beijing, Beijing 100083
3.
School of Mechanics and Civil Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China

Received Date: 2018-11-29
Rev Recd Date: 2019-04-28
Publish Date: 2019-08-01

Abstract

Abstract

In this paper we investigated the interaction mechanism between blast stress waves and cracks, and examined the variation of the dynamic characteristics of prefabricated horizontal static crack and horizontal motion crack produced by a split-tube holder charge under the normal incidence blast stress wave using the transmitted explosion dynamic caustics optical experiment system. The results showed that when the normal incident blast stress wave interacted with the stationary crack, the P wave causes the crack to close and then open, and the S wave formed a wavy speckle on the crack wall surface and the speckle alternately expands up and down along the stress wave propagation direction. The stress field surrounding the moving crack tip exerted a significant influence on the crack initiation and propagation of the static cracks. The blast stress wave generated by the post-explosion blasthole had an obvious impact on the dynamic characteristics of the horizontal directional motion crack produced by the first blasthole. When the direction of the propagation of the blast stress wave coincided with the direction of the propagation of the moving crack, the P wave causes the crack propagation velocity and the stress intensity factor ${\rm{K}}_{\rm{I}}^{\rm{d}}$ to decrease at first and then increase, the S wave promoted the crack propagation and the crack propagation was strengthened after the wave-crack interaction. When the direction of the propagation of the blast stress wave was opposite to the direction of the moving crack propagation, the P wave suppressed the expansion of the moving crack, and the moving crack propagation velocity and the stress intensity factor $K_{\rm{I}}^{\rm{d}}$ were gradually reduced after the wave-crack interaction.
- blast stress wave with normally incidence,
- stationary crack,
- blasting moving crack,
- wave-crack interaction

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References

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