Numerical Simulation of the Propagation Law of Explosion Shock Wave in Turning Tunnel

doi:10.12382/bgxb.2023.0889

Abstract

Abstract:

Based on the LS-DYNA software, a single TNT explosion in a turning tunnel is simulated to verify the accuracy of the simulation using LS-DYNA, and the effects of the variable angle θ and the radius of curvature R on the propagation law of shock wave in the turning tunnel are studied. The results show that, when θ and R are small, the changes of θ and R have a greater effect on the changes of shock wave parameters at the tunnel deflection, and the effect is smaller at the far field; when θ is 90° and R is 0mm, the pressure on the outer wall surface at the deflection in the tunnel is 2.17 times of the pressure on the inner wall surface. With the increase of θ, the peak overpressure of the reflected shock wave decreases, and the energy distribution of the shock wave tends to change to the back tunnel, and the peak overpressure at the far field decreases first and then increases; with the increase of R, the reflection phenomenon of the shock wave at the change of direction is not obvious, and the peak overpressure of the reflected shock wave is low; and with the increase of θ and R, the difference between the peak overpressures of the reflected pressures received by the outer wall surface and the inner wall surface decreases. When θ and R are increased to a certain degree, respectively, the effect of changing θ and R on the change of shock wave parameters in the whole tunnel is not obvious, but the pressure on the outer wall surface is still slightly higher than that on the inner wall surface.

Key words: blast wave propagation, turning tunnel, explosive mechanics, overpressure peak, numerical simulation

CLC Number:

O383

YU Wenjun, CHEN Shengyun, DENG Shuxin, YU Bingbing, JIN Dongyan. Numerical Simulation of the Propagation Law of Explosion Shock Wave in Turning Tunnel[J]. Acta Armamentarii, 2023, 44(S1): 180-188.

Figures/Tables 14

Table 1 Air material parameters and Equation of state parameters

C₀/MPa	C₁	C₂	C₃	C₄	C₅	C₆	V	E/MPa	ρ/(kg·m^-3)
0	0	0	0	0	0.4	0.4	1.0	0.25	1.29

Table 2 TNT explosive material parameters and equation of state parameters

A/GPa	B/GPa	R₁	R₂	ω	V₀	E₀/(GJ·m^-3)	ρ/(kg·m^-3)	D/(m·s^-1)	p_CJ/GPa
371	3.231	4.5	0.95	0.3	1.0	7	1630	6930	2.7

Fig.1 Schematic diagram of measuring points

Fig.2 Comparison of numerical simulation and empirical formulas

Fig.3 Pressure time history curves of different measuring points in a straight tunnel

Fig.4 Pressure nephogram in a straight tunnel

Fig.5 Pressure nephogram in a 90 ° turning tunnel

Fig.6 Time history curve of shock wave overpressure at measuring points 3 and 5 for R=0

Fig.7 Pressure nephograms in the 120° and 150° turning directional tunnels

Fig.8 Impact of reflected shock waves on the pressures on the inner and outer walls at the change of direction

Fig.9 Impact of reflected shock wave on pressure at the measuring point in the direction of change

Fig.10 Pressure nephogram in R=1000mm turning

Fig.11 Impact of angle of change θ on peak overpressure

Fig. 12 Effect of curvature radius R/r on peak overpressure

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