Vibration velocity threshold of a tunnel adjacent to surrounding layered rocks under blasting load

Wu Liang; Li Feng; Lu Wenbo; Chen Ming; Xu Feng

doi:10.11883/1001-1455(2017)02-0208-07

Volume 37 Issue 2

Mar. 2017

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Wu Liang, Li Feng, Lu Wenbo, Chen Ming, Xu Feng. Vibration velocity threshold of a tunnel adjacent to surrounding layered rocks under blasting load[J]. Explosion And Shock Waves, 2017, 37(2): 208-214. doi: 10.11883/1001-1455(2017)02-0208-07

Citation:

Wu Liang, Li Feng, Lu Wenbo, Chen Ming, Xu Feng. Vibration velocity threshold of a tunnel adjacent to surrounding layered rocks under blasting load[J]. Explosion And Shock Waves, 2017, 37(2): 208-214. doi: 10.11883/1001-1455(2017)02-0208-07

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Vibration velocity threshold of a tunnel adjacent to surrounding layered rocks under blasting load

doi: 10.11883/1001-1455(2017)02-0208-07

Wu Liang^{1, 2
,},
Li Feng^{1, 2, 4},
Lu Wenbo³,
Chen Ming³,
Xu Feng^{1, 2}

1.
College of Science, Wuhan University of Science and Technology, Wuhan 430065, Hubei, China
2.
Blasting Technology Research Center, CRPCE-WUST, Wuhan 430065, Hubei, China
3.
State Key Laboratory of Water Resource and Hydropower Engineering Science, Wuhan University, Wuhan 430072, Hubei, China
4.
Guizhou Xinlian Blasting Engineering Group Co Ltd, Guiyang 550002, Guizhou, China

Received Date: 2015-09-07
Rev Recd Date: 2015-11-18
Publish Date: 2017-03-25

Abstract

Abstract

Under a blasting load, the front side adjacent to blasting in an existing tunnel surrounded by layered rocks is apt to be destroyed, and therefore it is of critical importance to keep the tunnel safe from the destructive effects of the surrounding rocks cracks and damages that occur in a blasting disturbance. In this work, based on elastic mechanics and structural mechanics, we established a simplified mechanical model for the most dangerous point of the tunnel s blasting side, and obtained the stress formula that can calculate the stress at this point. We also analyzed the regular influence of such different factors as the ratio of the tunnel radius to the thickness of layer, the inclination angle, the central angle and depth of the surrounding layered rocks on the stress. In addition, using the theory of the maximum tensile stress, we calculated the surrounding rocks‘ critical vibration velocity that ensures the stability of the tunnel and obtained, according to the attenuation patterns of seismic wave propagation, the maximum charge of detonation for the construction of a new tunnel.
- stability of surrounding rock,
- blasting,
- tunnel,
- layered rock,
- vibration velocity

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References(22)

References

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