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Volume 37 Issue 5
Nov 2023
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Chinese Journal of High Pressure Physics  > 2023  >  37(5): 055302.
LIANG Shifan, CHAO Xiaohui, WEI Yongdong, WANG Guangyong, GUO Jiaqi. Influence of Blasting Excavation of Post-Construction Tunnel on Vibration Velocity of Adjacent Tunnel under Different Conditions[J]. Chinese Journal of High Pressure Physics, 2023, 37(5): 055302. doi: 10.11858/gywlxb.20230678
Citation: LIANG Shifan, CHAO Xiaohui, WEI Yongdong, WANG Guangyong, GUO Jiaqi. Influence of Blasting Excavation of Post-Construction Tunnel on Vibration Velocity of Adjacent Tunnel under Different Conditions[J]. Chinese Journal of High Pressure Physics, 2023, 37(5): 055302. doi: 10.11858/gywlxb.20230678
shu

Influence of Blasting Excavation of Post-Construction Tunnel on Vibration Velocity of Adjacent Tunnel under Different Conditions

doi: 10.11858/gywlxb.20230678
  • 1.

    College of Civil Engineering, Henan Polytechnic University, Jiaozuo 454000, Henan, China

  • 2.

    CCCC Second Highway Engineering Co., Ltd., Xi’an 710065, Shaanxi, China

  • Received Date: 12 Jun 2023
  • Rev Recd Date: 03 Jul 2023
    • Available Online: 20 Sep 2023
  • Issue Publish Date: 07 Nov 2023
    Abstract
  • The blasting load generated by the blasting excavation of the tunnel has an impact on the adjacent building structure. In order to study the influence of the blasting excavation of the post-construction tunnel on the adjacent tunnel, this paper takes the E60 highway tunnel in Georgia as the engineering background. Through the numerical simulation of the blasting excavation of the large-section shallow-buried double-track tunnel, the influence of the blasting load on the vibration velocity of the adjacent tunnel with different tunnel spacing, tunnel buried depths and surrounding rock grades was explored. The results showed that the blasting load propagated from the tunnel face of the later construction tunnel to the surrounding rock, and the vibration velocity of the surrounding rock reaches the maximum value at the 5 m section in front of the adjacent tunnel from the blasting source. The vibration velocity in front of the adjacent tunnel from the blasting source is greater than that behind it. In addition, the vibration velocity of the facing-blasting side of the adjacent tunnel is much larger than that of the back-blasting side, and the attenuation rate of the vibration velocity of the facing-blasting side is greater than that of the back-blasting side, in which the arch waist of the adjacent tunnel is most obviously affected by the blasting load. The maximum vibration velocity of the surrounding rock of the adjacent tunnel is in the x-direction, followed by the z-direction and the minimum in the y-direction. Under different conditions, the tunnel spacing, tunnel burial depth and surrounding rock grade are inversely proportional to the vibration velocity of the surrounding rock and initial support of the adjacent tunnel, in which different rock level on the adjacent tunnel blasting effect is the most significant.

     

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