Investigation of the effects of two parameters of longitudinal axis rotation angle (bend) and local variation of tunnel cross section on reduction of pressure due to explosion at the tunnel opening

Document Type : Original Article

Authors

Imam Hossein University

Abstract

Explosions at the entrance of tunnels and underground spaces can lead to losses. To decrease side effects of such explosions, some approaches like dead_end, bends, geometric barriers and anti-explosion doors are available. Using geometric barriers, especially the waveguides, is the most commonly used and economical way. The purpose of this paper is to investigate the effect of the angle of rotation of the longitudinal axis (bend) and the local variation of the tunnel area on reducing the impact of explosions. Appropriate angle of rotation of the longitudinal axis and suitable location for local variation of the tunnel cross section in line with the tunnel are calculated, by numerical analysis, using Abaqus software. 
Finally, proper characteristics are used to propose a method, requiring the least drilling in construction (the most economical method), and generating the highest reduction in the effects of the explosion (the highest vulnerability reduction) in explosions near and away from the span. The results show that the localized change in the tunnel cross-section at the end of the direct path and the change in the angle of rotation of the long axis from 135 ° to 90 ° (90 °) will lead to the greatest reduction in pressure.

Keywords

References

  1. پیمان، صفا، طهماسب زاده، مهدی، بررسی تأثیر موج‌گیر در تونل با خم 90 درجه بر کاهش فشار ناشی از انفجار خارج از تونل، دوره 6، شماره 3، پاییز 1394.##
    1. L. Zhang and X. Yang, “Soil-tunnel Interaction under Medium Internal Blast Loading,” Procedia Engineering, vol. 143, pp. 403-410 , 2016.##
    2. E. A. Edvard Benggeli, “Blast Wave Propagation Inside Tunnel,” 1986.##
    3. M. A. Price, “An Approach to Modeling Blast and Fragment Risks from Improvised Explosive Devices,” Applied Mathematical Modelling, vol. 50, pp. 715-731, 2017.##
    4. U. DoD, “Design and Analysis of Hardened Structures to Conventional Weapons Effects,” UFC 3-340-01, US DoD, Washington, DC, USA, 2002.##
    5. J. Liu, Q. Yan, and J. Wu “Analysis of Blast Wave Propagation Inside Tunnel,” Transactions of Tianjin University, vol. 14, no. 5, pp. 358-362, 2008.##

Files

History

  • Receive Date: 08 May 2019
  • Revise Date: 30 June 2019
  • Accept Date: 07 August 2019
  • Publish Date: 22 July 2020

Share

How to cite

Statistics