Vibration prediction and energy analysis of slope under blasting load in underpass tunnel

HE Li; ZHONG Dongwang; LI Peng; SONG Kun; SI Jianfeng

doi:10.11883/bzycj-2019-0255

Volume 40 Issue 7

Jul. 2020

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HE Li, ZHONG Dongwang, LI Peng, SONG Kun, SI Jianfeng. Vibration prediction and energy analysis of slope under blasting load in underpass tunnel[J]. Explosion And Shock Waves, 2020, 40(7): 075201. doi: 10.11883/bzycj-2019-0255

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HE Li, ZHONG Dongwang, LI Peng, SONG Kun, SI Jianfeng. Vibration prediction and energy analysis of slope under blasting load in underpass tunnel[J]. Explosion And Shock Waves, 2020, 40(7): 075201. doi: 10.11883/bzycj-2019-0255

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Vibration prediction and energy analysis of slope under blasting load in underpass tunnel

doi: 10.11883/bzycj-2019-0255

HE Li^{1, 2, 3
,},
ZHONG Dongwang^{2
,
,},
LI Peng¹,
SONG Kun³,
SI Jianfeng²

1.
Key Laboratory of Geotechnical Mechanics and Engineering of the Ministry of Water Resources, Yangtze River Scientific Research Institute, Wuhan 430010, Hubei, China
2.
Hubei Province Key Laboratory of Systems Science in Metallurgical Process, Wuhan University of Science and Technology, Wuhan 430065, Hubei, China
3.
Key Laboratory of Geological Hazards on Three Gorges Reservoir Area, Ministry of Education, China Three Gorges University, Yichang 443002, Hubei, China

Received Date: 2019-06-26
Rev Recd Date: 2019-12-16

Available Online: 2020-06-25

Publish Date: 2020-07-01

Abstract

Abstract

In order to solve the safety problem in the construction of slope and underpass adjacent tunnel by cooperative blasting, based on the expansion project of a domestic petroleum reserve base, the formula of peak vibration velocity considering elevation effect was established, and the vibration energy attenuation mechanism of tunnel blasting along the slope surface was systematically studied by using method combining dimension derivation, field test and signal analysis. The results show that the peak value of particle velocity at the edge of the same step is larger than that at the foot of the inner slope, and there is an elevation amplification effect of vibration velocity on the local slope surface. The blasting vibration formula with relative slope H/D has high accuracy in predicting the particle vibration velocity on the slope, and can reflect the influence of slope angle on the elevation amplification effect of vibration velocity. The vibration velocity and energy decay faster in the near region and slower in the far region with the increase of propagation distance. The energy of tunnel blasting vibration is concentrated in several Sub-vibration frequency bands in the range of 0-300 Hz, and the high frequency energy decays faster along slope surface. The median of dominant frequency band decays exponentially, and the energy concentrates in the low frequency band eventually.
- slope,
- tunnel blasting,
- dimensional analysis,
- peak velocity,
- vibration energy,
- elevation amplification effect,
- relative slope

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References(24)

References

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