Study on dynamic crack initiation and propagation behavior of surrounding rock of adjacent roadway

Yang Liyun; Zhang Fei; Chen Siyu; Hu Huanning; Wang Ziyang; Lin Changyu

doi:10.19606/j.cnki.jmst.2021.05.005

Volume 6 Issue 5

Sep. 2021

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Yang Liyun, Zhang Fei, Chen Siyu, Hu Huanning, Wang Ziyang, Lin Changyu. Study on dynamic crack initiation and propagation behavior of surrounding rock of adjacent roadway[J]. Journal of Mining Science and Technology, 2021, 6(5): 558-568. doi: 10.19606/j.cnki.jmst.2021.05.005

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Study on dynamic crack initiation and propagation behavior of surrounding rock of adjacent roadway

doi: 10.19606/j.cnki.jmst.2021.05.005

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

Received Date: 2021-03-04
Rev Recd Date: 2021-05-24
Publish Date: 2021-10-01

Abstract

Abstract

In order to study the mechanical behavior characteristics of dynamic crack initiation and propagation of surrounding rock of adjacent roadway under impact load, with the help of a new digital laser dynamic caustics experimental system, a rock-like medium material PMMA was used to make a double-section roadway model for impact tests, and the crack propagation simulation was carried out based on the ABAQUS numerical simulation platform. The results show that when the pre-crack deflection angle α of adjacent sections is 45°, 22. 5°, 0°, -22. 5°, -45°, the dynamic stress intensity factor are different when the cracks were initiated. The dynamic stress intensity factor change after crack initiation has a "platform section" with a duration of about 160 μs. When the right crack gradually moves away from the left cross-section, the crack propagation speed of left crack after initiation will increase. When the dynamic crack initiation and propagation of the double-section roadway, the adjacent sections will affect the dynamic stress intensity factor and propagation speed to a certain extent. When the tip of the right crack is close to the left crack, the latter's crack initiation toughness is reduced, that is, it is easier to crack.
- impact load,
- caustics,
- crack propagation,
- stress intensity factor,
- numerical simulation

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References(25)

References

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Study on dynamic crack initiation and propagation behavior of surrounding rock of adjacent roadway

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