Analysis on whole dynamical fracture process of tight sandstone tunnel model under impact loading

ZHOU Lei; ZHU Zheming; WANG Meng; ZHOU Changlin; DONG Yuqing; YING Peng

doi:10.11883/bzycj-2018-0073

Volume 39 Issue 9

Sep. 2019

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ZHOU Lei, ZHU Zheming, WANG Meng, ZHOU Changlin, DONG Yuqing, YING Peng. Analysis on whole dynamical fracture process of tight sandstone tunnel model under impact loading[J]. Explosion And Shock Waves, 2019, 39(9): 095101. doi: 10.11883/bzycj-2018-0073

Citation:

ZHOU Lei, ZHU Zheming, WANG Meng, ZHOU Changlin, DONG Yuqing, YING Peng. Analysis on whole dynamical fracture process of tight sandstone tunnel model under impact loading[J]. Explosion And Shock Waves, 2019, 39(9): 095101. doi: 10.11883/bzycj-2018-0073

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Analysis on whole dynamical fracture process of tight sandstone tunnel model under impact loading

doi: 10.11883/bzycj-2018-0073

MOE Key Laboratory of Deep Underground Science and Engineering, College of Architecture and Environment, Sichuan University, Chengdu 610065, China

Received Date: 2018-03-09
Rev Recd Date: 2018-05-09

Available Online: 2019-08-25

Publish Date: 2019-09-01

Abstract

Abstract

In order to investigate the properties of crack fracture time, propagation speed and arrest period in the surrounding rock of tunnel under different impact loading speed, the dynamic tests were performed by self-developed adjustable speed drop weight impact test system, and the tight green sandstone was selected to make the cracked tunnel specimens. A crack propagation gauge (CPG) was applied to measure dynamic initiation time, propagation speeds and arrest time, respectively. The properties of crack propagation velocity, crack fracture time and crack arrest period were discussed and analyzed. The corresponding numerical simulation was carried out by AUTODYN code, and the simulation results showed that the crack propagation speeds and crack fracture time generally agree with the experimental results, and crack arrest period also was calculated. The results show that crack propagation speeds increase with impact loading speed, but as the impact loading speed is larger than a certain value, the crack speeds tend toward a stable value; Crack fracture time decreases with the increase of impact loading speed, and as the loading rate is larger than a certain value, it tends toward a stable value; With the increase of the impact loading speed, the crack arrest period in the crack propagation path gradually decreases.
- tunnel,
- impact loading,
- crack propagation speeds,
- crack fracture time,
- crack arrest time

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References(35)

References

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