Influence of in-situ stress redistribution on proportional radii of blasting-induced cracking zones in tunnel excavation

CHEN Ming; LU Wen-bo; ZHOU Chuang-bing

doi:10.11883/1001-1455(2009)03-0328-05

Volume 29 Issue 3

Sep. 2014

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CHEN Ming, LU Wen-bo, ZHOU Chuang-bing. Influence of in-situ stress redistribution on proportional radii of blasting-induced cracking zones in tunnel excavation[J]. Explosion And Shock Waves, 2009, 29(3): 328-332. doi: 10.11883/1001-1455(2009)03-0328-05

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CHEN Ming, LU Wen-bo, ZHOU Chuang-bing. Influence of in-situ stress redistribution on proportional radii of blasting-induced cracking zones in tunnel excavation[J]. Explosion And Shock Waves, 2009, 29(3): 328-332. doi: 10.11883/1001-1455(2009)03-0328-05

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Influence of in-situ stress redistribution on proportional radii of blasting-induced cracking zones in tunnel excavation

doi: 10.11883/1001-1455(2009)03-0328-05

1.
State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, Hubei, China

Publish Date: 2009-05-25

Abstract

Abstract

Based on the study on the forming mechanism of blasting-induced crack under blasting stress wave, by adopting the Mohr-Coulomb criterion and the maximum stress criterion, the influence of in-situ stress redistribution on the proportional radius of the blasting-induced cracking zone (PRBICZ) in deep-buried tunnel excavation was explored. Results indicate that the in-situ stress redistribution has great influence on the PRBICZ, and that the in-situ stress redistribution in the rock mass can decrease the radial PRBICZ. Under compression and shear failure, the PRBICZ can be decreased more than 20%; under tension failure, the PRBICZ can be decreased more than 10%. Compression and shear failure of the rock mass is more likely to occur along the soft structure plane under blasting stress wave. The in-situ stress redistribution can reduce the blasting-induced cracking zone.
- mechanics of explosion,
- crack,
- blasting stress wave,
- rock mass,
- in-situ stress,
- tunnel

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