Influence of altitude on the propagation of explosion shock waves in a long straight tunnel

LI Yong; LUO Hongyu; FENG Xiaowei; HU Yupeng; ZHANG Jun; LI Haitao

doi:10.11883/bzycj-2023-0230

Volume 44 Issue 3

Mar. 2024

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LI Yong, LUO Hongyu, FENG Xiaowei, HU Yupeng, ZHANG Jun, LI Haitao. Influence of altitude on the propagation of explosion shock waves in a long straight tunnel[J]. Explosion And Shock Waves, 2024, 44(3): 032201. doi: 10.11883/bzycj-2023-0230

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LI Yong, LUO Hongyu, FENG Xiaowei, HU Yupeng, ZHANG Jun, LI Haitao. Influence of altitude on the propagation of explosion shock waves in a long straight tunnel[J]. Explosion And Shock Waves, 2024, 44(3): 032201. doi: 10.11883/bzycj-2023-0230

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Influence of altitude on the propagation of explosion shock waves in a long straight tunnel

doi: 10.11883/bzycj-2023-0230

LI Yong^{1, 2
,},
LUO Hongyu^{1, 2},
FENG Xiaowei^{3
,
,},
HU Yupeng³,
ZHANG Jun³,
LI Haitao^{1, 2}

1.
State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China
2.
School of Resources and Safety Engineering, Chongqing University, Chongqing 400044, China
3.
Institute of Systems Engineering, China Academy of Engineering Physics, Mianyang 621999, Sichuan, China

Received Date: 2023-06-29
Rev Recd Date: 2023-11-20

Available Online: 2023-12-27

Publish Date: 2024-03-14

Abstract

Abstract

To effectively characterize the propagation characteristics of the explosion shock waves in tunnels at different altitudes, nonlinear explicit dynamics finite element software AUTODYN and dimensional analysis were used to study the influence of altitude on the propagation of explosion shock waves in long straight tunnels, and the influence characteristics of high altitude environments on the propagation of shock waves in tunnels were explored. First of all, the accuracy of the computational method was verified by comparing the peak overpressure and the time of overpressure rise of the small-scale shock tube test and the numerical simulation at the same measurement point. Then based on the AUTODYN-2D Euler symmetric algorithm and standard atmospheric parameters, the shock wave parameters of TNT explosion with 10 kg TNT spherical charge explosion in a tunnel with a diameter of 2.5 m and a length of 40 m at altitudes from 0 to 4000 m were computed, which were arranged with gauges with an axial interval of 2 m and a radial interval of 0.25 m, such as plane wave formation distance, peak overpressure, shock wave front propagation velocity, impulse, etc. In the end, a polynomial theoretic calculation model for shock wave peak overpressure in a tunnel at different altitudes was proposed with coefficients least-squares fitted from numerical simulation data at sea level, and the variables were obtained by dimensional analysis and the extended Sachs scaling law. The results show that, with the increase of altitude, the deviations between the propagation velocity of the explosion shock wave front and the radial parameters of the shock wave in the tunnel increases, the formation distance of the plane wave increases, and the peak overpressure of the shock wave decreases. Within the altitude range of 0 to 4000 m, the average value of shock wave impulse decreases by about 0.91% for every 1000 m increase. By combining the extended Sachs scaling law with dimensional analysis, a theoretical analysis model for calculating peak overpressure of shock waves at different altitudes with no more than 10% deviation is derived, which can provide a theoretical basis for explosion shock wave propagation in tunnels at high altitudes.
- altitude,
- tunnel,
- explosion shock wave,
- dimensional analysis,
- propagation property

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References(32)

References

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