Propagation characteristics and failure behaviors of crack in tunnel under impact loads

ZHOU Lei; ZHU Zheming; DONG Yuqing; YING Peng

doi:10.11883/bzycj-2016-0383

Volume 38 Issue 4

May 2018

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ZHOU Lei, ZHU Zheming, DONG Yuqing, YING Peng. Propagation characteristics and failure behaviors of crack in tunnel under impact loads[J]. Explosion And Shock Waves, 2018, 38(4): 785-794. doi: 10.11883/bzycj-2016-0383

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ZHOU Lei, ZHU Zheming, DONG Yuqing, YING Peng. Propagation characteristics and failure behaviors of crack in tunnel under impact loads[J]. Explosion And Shock Waves, 2018, 38(4): 785-794. doi: 10.11883/bzycj-2016-0383

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Propagation characteristics and failure behaviors of crack in tunnel under impact loads

doi: 10.11883/bzycj-2016-0383

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

Received Date: 2016-12-14
Rev Recd Date: 2017-01-22
Publish Date: 2018-07-25

Abstract

Abstract

In order to obtain the dynamic response of the pre-cracked tunnel under impact loads, we investigated the crack propagation characteristics in the tunnel using the green sandstone as the model material of the tunnel, and the self-developed adjustable speed-drop hammer impact tester that can realize low- and medium-impact loading speed as the loading device. We determined the crack's initiation time, propagation velocity and arrest time, using a measuring system consisting of a crack propagation gauge and a strain gauge, and successfully obtained the crack's initiation toughness, propagation toughness and arrest toughness using the finite element software AUTODYN and ABAQUS based on the test data. The results showed that crack arrest occurred in the process of crack propagation; and that the experimental-numerical method can be successfully used to calculate the crack initiation toughness, propagation toughness and arrest toughness. Further, we conducted a preliminary analysis of crack arrest, and examined the influence of internal stress reflection wave and transmission wave on crack arrest.
- tunnel,
- crack,
- initiation toughness,
- propagation toughness,
- arrest toughness,
- propagation velocity

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References

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