Generation mechanism and propagation characteristics of blasting seismic waves on tunnel surface

MENG Xianzhong; ZHOU Chuanbo; JIANG Nan; ZHANG Yuqi; ZHANG Zhen; WU Di

doi:10.11883/bzycj-2023-0217

Volume 44 Issue 2

Feb. 2024

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MENG Xianzhong, ZHOU Chuanbo, JIANG Nan, ZHANG Yuqi, ZHANG Zhen, WU Di. Generation mechanism and propagation characteristics of blasting seismic waves on tunnel surface[J]. Explosion And Shock Waves, 2024, 44(2): 025201. doi: 10.11883/bzycj-2023-0217

Citation:

MENG Xianzhong, ZHOU Chuanbo, JIANG Nan, ZHANG Yuqi, ZHANG Zhen, WU Di. Generation mechanism and propagation characteristics of blasting seismic waves on tunnel surface[J]. Explosion And Shock Waves, 2024, 44(2): 025201. doi: 10.11883/bzycj-2023-0217

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Generation mechanism and propagation characteristics of blasting seismic waves on tunnel surface

doi: 10.11883/bzycj-2023-0217

1.
Faculty of Engineering, China University of Geosciences, Wuhan 430074, Hubei, China
2.
State Key Laboratory of Precision Blasting, Jianghan University, Wuhan 430056, Hubei, China
3.
Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, Hubei, China

Received Date: 2023-06-19
Rev Recd Date: 2023-12-18

Available Online: 2023-12-19

Publish Date: 2024-02-06

Abstract

Abstract

In tunnel blasting and excavation engineering, blasting vibration is the main harmful effect affecting safety and stability. In order to investigate the generation mechanism and propagation patterns of seismic waves resulting from blasting in tunnel contexts, a theoretical model based on plane strain conditions is developed to depict the tunnel surface vibration caused by blasting. Then, a solution in integral form is derived to describe the surface vibration field generated from tunnel blasting. Utilizing the Longnan tunnel blasting project as a contextual backdrop, a finite element numerical model is established to recreate the conditions. This allows for the validation of both the numerical simulations and theoretical solutions through on-site tests. To elucidate the propagation characteristics of distinct types of seismic waves resulting from blasting, a method adopting a high-resolution Radon transform approach is devised to separate the tunnel blasting seismic wave field. By combining theoretical analysis with numerical simulation, the propagation characteristics of P-waves, S-waves, and R-waves are ascertained. Further, by synthesizing theoretical results and wave field separation results, the seismic wave action partition of tunnel blasting is proposed. The results show that tunnel blasting excites P-waves and S-waves, while R-waves surge swiftly upon encountering the free surface. The triad of wave categories displays exponential attenuation tendencies, with S-waves demonstrating a swifter decay rate than P-waves, and P-waves outpacing R-waves in this regard. In terms of directional dominance, the main component in the vertical direction changes from S-wave to R-wave, and the main component in the horizontal direction changes from S-wave to P-wave, and then P-wave changes to R-wave. A detailed spatial analysis further elucidates this scenario. Under the working conditions of grade Ⅳ surrounding rock, the seismic wave action zone of tunnel blasting is as follows: the area of 0–6.44 m away from the tunnel axis to the tunnel face is regarded as the near area of blasting, where the dominant wave type is horizontal S-wave; the area of 6.44–21.23 m is regarded as the middle area of blasting, where the dominant wave type is horizontal P-wave; and the area beyond 21.23 m is regarded as blasting far zone, where the dominant wave type is vertical R-wave. In addition, a linear relationship exists between the boundary point of the blasting zone and the maximum amount of charge in a single section, and the position of the blasting zone in the tunnel can be obtained through the amount of blasting charge, which can be used for the analysis of the safety and stability of the tunnel.
- blasting seismic wave,
- tunnel blasting,
- generation mechanism,
- propagation characteristics,
- theoretical analysis

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References(30)

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