Secondary Damage Response of Cracked Tunnels under Explosion

WANG Guilin; YU Hao; ZHAI Jun; CHEN Xiangyu; WANG Runqiu; GONG Sheng

doi:10.11858/gywlxb.20230656

Volume 37 Issue 5

Nov 2023

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Chinese Journal of High Pressure Physics > 2023 > 37(5): 055303.

WANG Guilin, YU Hao, ZHAI Jun, CHEN Xiangyu, WANG Runqiu, GONG Sheng. Secondary Damage Response of Cracked Tunnels under Explosion[J]. Chinese Journal of High Pressure Physics, 2023, 37(5): 055303. doi: 10.11858/gywlxb.20230656

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WANG Guilin, YU Hao, ZHAI Jun, CHEN Xiangyu, WANG Runqiu, GONG Sheng. Secondary Damage Response of Cracked Tunnels under Explosion[J]. Chinese Journal of High Pressure Physics, 2023, 37(5): 055303. doi: 10.11858/gywlxb.20230656

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Secondary Damage Response of Cracked Tunnels under Explosion

doi: 10.11858/gywlxb.20230656

WANG Guilin^{1, 2
,},
YU Hao^{1, 2},
ZHAI Jun³,
CHEN Xiangyu^{1, 2},
WANG Runqiu^{1, 2},
GONG Sheng^{1, 2}

1.
School of Civil Engineering, Chongqing University, Chongqing 400045, China
2.
National Joint Engineering Research Center of Geohazards Prevention in the Reservoir Areas, Chongqing 400045, China
3.
Key Laboratory of the Three Gorges Reservoir Region’s Eco-Environment, Chongqing University, Chongqing 400045, China

Received Date: 03 May 2023
Rev Recd Date: 01 Jun 2023
Accepted Date: 15 Jun 2023

Available Online: 11 Oct 2023

Issue Publish Date: 07 Nov 2023

Abstract

Abstract

Tunnel structures in service usually have initial cracking damage, which can affect the tunnel structure when exposed to explosive. In this paper, the secondary damage and response law of the subway tunnel with crack under explosion were simulated by using the material point method with multistage background grid. Under the explosion, the initial crack damage causes a decrease of the stiffness of the lining structure, and increases the damage range of the tunnel floor by 34.2% at the track zone. Besides, the initial crack accelerates the damage speed of the tunnel structure. The depth and length of the initial crack damage significantly alter the dynamic response of the tunnel structure and surrounding rock. The secondary damage area of the track floor increases linearly with the crack depth. When the crack depth reaches half of the lining thickness, the equivalent plastic strain peak increases the fastest. Moreover, the secondary damage area at the track floor, the peak plastic strain, and the peak displacement of the surrounding rock, all increase with the lining crack length, but the growth rate slows down gradually.
- subway tunnel,
- initial crack,
- explosion loading,
- secondary damage,
- material point method

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References

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Secondary Damage Response of Cracked Tunnels under Explosion

doi: 10.11858/gywlxb.20230656

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Secondary Damage Response of Cracked Tunnels under Explosion

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