Study on the Behavior of Blasting Crack Propagation under Different Crack Widths

JI Zhe; YUE Wenhao; SU Hong; GONG Yue; YAN Zhengtuan; LIU Buqing; CHEN Guodong; HAN Yujian

doi:10.11858/gywlxb.20240733

Volume 38 Issue 6

Nov 2024

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Chinese Journal of High Pressure Physics > 2024 > 38(6): 064107.

JI Zhe, YUE Wenhao, SU Hong, GONG Yue, YAN Zhengtuan, LIU Buqing, CHEN Guodong, HAN Yujian. Study on the Behavior of Blasting Crack Propagation under Different Crack Widths[J]. Chinese Journal of High Pressure Physics, 2024, 38(6): 064107. doi: 10.11858/gywlxb.20240733

Citation:

JI Zhe, YUE Wenhao, SU Hong, GONG Yue, YAN Zhengtuan, LIU Buqing, CHEN Guodong, HAN Yujian. Study on the Behavior of Blasting Crack Propagation under Different Crack Widths[J]. Chinese Journal of High Pressure Physics, 2024, 38(6): 064107. doi: 10.11858/gywlxb.20240733

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Study on the Behavior of Blasting Crack Propagation under Different Crack Widths

doi: 10.11858/gywlxb.20240733

School of Chemical and Blasting Engineering, Anhui University of Science and Technology, Huainan 232000, Anhui, China

Received Date: 26 Feb 2024
Rev Recd Date: 01 Apr 2024

Available Online: 25 Nov 2024

Issue Publish Date: 05 Dec 2024

Abstract

Abstract

To study the influence of slit width on the dynamic propagation behavior of blast cracks, the digital laser dynamic caustic line experimental system and fractal theory were used to study the propagation laws of blast cracks at six different crack widths. The results show that the length of burst cracks in the cut direction is greater than that in the non-cut direction. With the increase of the slit width, the propagation length of burst crack increases first and then decreases. When the slit width increases to 0.4 mm, the main crack propagation length is the largest, and when the slit width continues to increase, the main crack propagation length decreases. When the slit width is 0.2 and 0.4 mm, the fractal dimension is larger than that of other slit widths, the expansion length of the main crack is longer than that of other widths, and the directional fracture effect of the specimen is better. With the increase of the slit width, the stress intensity factor and velocity peak value of the main crack propagation of the slot shows a trend of first decreasing rapidly, then increasing to the secondary peak, and finally oscillating and decreasing. When the crack width is 0.2 and 0.4 mm, the peak value of the stress intensity factor and the expansion velocity of the main crack are larger than those of other crack widths. The research results provide a certain basis for the selection of slit parameters in actual blasting engineering.
- dynamic caustic lines,
- crack propagation,
- stress intensity factor,
- box dimension

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References(27)

References

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Study on the Behavior of Blasting Crack Propagation under Different Crack Widths

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