Propagation of blast wave of thermobaric explosive inside&nbsp;a tunnel

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (5) : 23-29.

Propagation of blast wave of thermobaric explosive inside a tunnel

GENG Zhengang1,LI Xiudi1,2,MIAO Chaoyang1,2,FANG Hao1

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Abstract

Blast wave of thermobaric explosive is a serious threat to personnel and equipment inside a tunnel.Firstly,based on TNT blast test data verification,a numerical calculation model for an explosion entrance was established with the software AUTODYN.Secondly,the blast wave propagation characteristics inside a tunnel of thermobaric explosive whose state equation was described with JWL-Miller energy release model were studied through comparing with those of TNT blast wave.The constraint effect of a tunnel on the blast wave of thermobaric explosive was also investigated through comparing the propagation characteristics of thermobaric explosive side a tunnel with those on unconstrained ground.The results showed that thermobaric explosive has a greater destructive power; the average peak overpressure and positive phase impulse of thermobaric blast wave are1.91 times and 1.82 times of those of TNT,respectively; the equivalent coefficients of average overpressure and impulse of TNT for thermobaric explosive are1.94 and 2.21,respectively; the tunnel constrain effect on the blast wave of thermobaric explosive is obvious,the average peak overpressure and positive impulse of thermobaric shock wave in a tunnel are 13.55 times and 15.21 times of those on unconstrained ground.

Key words

thermobaric explosive / blast wave / tunnel / JWL-Miller state equation

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GENG Zhengang1,LI Xiudi1,2,MIAO Chaoyang1,2,FANG Hao1. Propagation of blast wave of thermobaric explosive inside a tunnel[J]. Journal of Vibration and Shock, 2017, 36(5): 23-29

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