Attenuation Characteristics and Mechanism of Explosion Shock Wave Generated by Thermobaric Explosive in L-shaped and Gallery Tunnels

doi:10.12382/bgxb.2023.0745

Abstract

Abstract:

The explosion tests of thermobaric explosive (TBX) in L-shaped and gallery tunnels were carried out on a self-established large-scale tunnel platform. According to the shock wave overpressure, positive pressure duration and specific impulse acquired from the tests, the propagation laws of shock wave in the two kinds of tunnel are studied, and the influence of tunnel shape on the waveform evolution and attenuation ability, and the forming mechanism of attenuation difference to the shock wave are analyzed. The results indicate that, in the L-shaped and gallery tunnels, the shock wave generates multiple interactions with wall surfaces to form the multi-waveforms with multi-peaks after entering the main tunnel through branch tunnels. The specific impulse in L-shaped tunnel is not significantly different from that in long straight tunnel, and the reduction coefficients of the overpressure of air explosion at and in tunnel entrance are 1 and 1.2, respectively. Compared to the long straight tunnel, the gallery tunnel has a significant attenuation effect on the shock wave, and the coefficients of overpressure and specific impulse at turning are both about 0.6. The difference in shock wave attenuation effect between L-shaped and gallery tunnels comes from the difference in propagation paths of shock waves after reaching the connected positions of the main and branch tunnels.

Key words: TBX, L-shaped tunnel, gallery tunnel, evolution of waveform, attenuation ability to shock wave

CLC Number:

TJ41
TU352.6

JI Yuguo, ZHANG Guokai, LI Gan, DENG Shuxin, XU Tianhan, YAO Jian, LI Jie, WANG Mingyang, HE Yong. Attenuation Characteristics and Mechanism of Explosion Shock Wave Generated by Thermobaric Explosive in L-shaped and Gallery Tunnels[J]. Acta Armamentarii, 2023, 44(S1): 26-40.

Figures/Tables 29

Fig.1 L-shaped lunnel

Fig.2 Test arrangement of long L-shaped tunnel

Fig.3 Test arrangement of short L-shaped tunnel

Fig.4 Internal space in gallery tunnel

Fig.5 Test arrangement of long gallery tunnel

Fig.6 Test arrangement of short gallery tunnel

Fig.7 Comparison of pressure curves at A3a and A7a in the tests of straight tunnel, long L-shaped tunnel and gallery tunnel

Fig.8 Comparison of pressure curves at A10 (20m) in the tests of straight and long L-shaped tunnels

Fig.9 Pressure curves at A8a, A10a and A10w in the long L-shaped tunnel test

Fig.10 Air pressure and wall pressure on the section of B1

Fig.11 Pressure curves at B1a - B4a in the main tunnel of long L-shaped tunnel

Fig.12 Pressure curves at same measuring points in the main tunnels of long and short L-shaped tunnels

Fig.13 Evolution process of waveform in the main tunnel of short L-shaped tunnel

Fig.14 Pressure curves around the connection of gallery tunnel

Fig.15 Pressure curves of shock waves in main and branch tunnels after the connection of gallery tunnel

Fig.16 Pressure curves at B1a in long and short gallery tunnels

Fig.17 Approximate triangular wave formed in short gallery tunnel

Fig.18 Pressure curves inside and outside the end of the main tunnel of L-shaped tunnel

Fig.19 Pressure curves at same measuring points in the long L-shaped and straight tunnels

Fig.20 Comparison of pressure curves at same points in the short L-shaped and straight tunnels

Fig.21 kI in the long and short L-shaped tunnels

Fig.22 kP and kt in long and short L-shaped tunnels

Fig.23 Comparison of pressure curves at same measuring points in the long gallery and straight tunnels

Fig. 24 kI in long and short gallery tunnels

Fig.25 kP and kt in long and short gallery tunnels

Fig.26 Pressure curves at A10w in L-shaped and gallery tunnels

Fig.27 Pressure curves at same measuring points in the main tunnels of L-shaped and gallery tunnels

Fig.28 Variation of kP with pressure peak and positive pressure duration[19]

Fig.29 Pressure curves of shock waves at A8 and B2a in long L-shaped tunnel

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