Numerical Simulation about the Effect of Tunnel Expansion Chamber on the Shock Wave Attenuation

Zhao, Bin; Cui, Cunyan; Chen, Jing-Peng; Wang, Yan

doi:10.2991/iccmcee-15.2015.106

Proceedings of the 2015 4th International Conference on Computer, Mechatronics, Control and Electronic Engineering 2015

DOI: 10.2991/iccmcee-15.2015.106

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Numerical Simulation about the Effect of Tunnel Expansion Chamber on the Shock Wave Attenuation

Bin Zhao¹,

Cunyan Cui²,

Jing-Peng Chen³

et al.

Abstract: Setting up an expansion chamber in the local tunnel can accelerate the attenuation speed of the shock wave, which is of great importance for safety protection of the tunnel staff. Under the same simplified conditions, the reliability of the numerical model was verified according to the theoretical formula calculation results. The simulation results of the long straight tunnel and the tunnel with expansion chamber were compared. Results show that the overpressure in the tunnel with expansion chamber is lower th… Show more

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Cited by 3 publications

References 2 publications

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Effects of Entrance Shape and Blast Pocket on Internal Overpressure Mitigation for Protective Tunnels Exposed to External Detonation on the Ground

2023

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This study presents a numerical analysis to reduce the overpressure inside protective tunnels for external detonations. A three-dimensional computational fluid dynamics model of a tunnel subjected to detonation for a hemispherical charge with a charge weight of 555 kg and a standoff distance of 7.6 m was established, based on a mesh sensitivity study to obtain an optimal element size, stability analysis of overpressure, and validation study to evaluate the accuracy of the numerical results based on Unified Facilities Criteria (UFC) 3-340-02. A parametric analysis was performed using the validated numerical model to investigate the effects of the entrance shape and blast pockets on the reduction in the maximum overpressure. The maximum overpressures were effectively reduced as the slope angle of the tunnel entrance decreased and the length of the blast pocket divided by the tunnel width decreased. An optimized shape of the tunnel was proposed based on the numerical results, where the peak overpressures were reduced by a maximum of 64.5%. This study aims to protect facilities, personnel, and equipment and further reduce construction costs by lowering the overpressure rating of blast valves in protective tunnels.

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Effects of Entrance Shape and Blast Pocket on Internal Overpressure Mitigation for Protective Tunnels Exposed to External Detonation on the Ground

2023

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Blast Overpressure Reduction Using Entrance Shape and Blast Pocket Depth of Protective Tunnels

Shin¹,

Pang²

2022

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Effects of Expansion and Side Chambers on Reduction and Time Delay of Blast Overpressures in Underground Protective Facilities

Pang¹,

Shin²

2022

J. Korean Soc. Hazard Mitig

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This study presents numerical investigation of blast overpressures on blast-resistant doors by changing the number of side chambers and the number and shape of expansion chambers for an external detonation. Blast overpressures for four types of door and zero to four chambers were simulated. For the original shape of the underground ammunition magazine with side chamters installed, the peak time delay was approximately 40 ms, showing a clear different, whereas the reduction in the maximum value appeared as small as 3 kPa. Reducing the overpressure and delaying peaks using bottleneck devices and side chambers revealed that, because the size of the tunnel with underground ammunition magazines was partially reduced, the effects of the reduction and time delay of blast overpressures were negligible. When expansion chambers with a size 1.1 times the passage width and side chambers were used, the time delay in the peaks and overpressure reduction were observed. When expansion chambers with a size 1.2 times the passage width and side chambers were used, the delay and reduction effects were significant when two or more chambers were installed, and the effect was almost the same as when the size was 1.1 times the passage width.

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Numerical Simulation about the Effect of Tunnel Expansion Chamber on the Shock Wave Attenuation

Cited by 3 publications

References 2 publications

Effects of Entrance Shape and Blast Pocket on Internal Overpressure Mitigation for Protective Tunnels Exposed to External Detonation on the Ground

Effects of Entrance Shape and Blast Pocket on Internal Overpressure Mitigation for Protective Tunnels Exposed to External Detonation on the Ground

Blast Overpressure Reduction Using Entrance Shape and Blast Pocket Depth of Protective Tunnels

Effects of Expansion and Side Chambers on Reduction and Time Delay of Blast Overpressures in Underground Protective Facilities

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