Propagation Law of Blast Wave in a Flat Large Space

doi:10.11908/j.issn.0253-374x.23152

Home > Archive>Volume 51, Issue 12, 2023 >1900-1909. DOI:10.11908/j.issn.0253-374x.23152

Propagation Law of Blast Wave in a Flat Large Space
DOI:
                        10.11908/j.issn.0253-374x.23152
                    
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                        LIU Zhonghui1,2LIU Zhonghui
College of Civil Engineering， Tongji University， Shanghai 200092， China;Zhejiang Industry Polytechnic College，Shaoxing 312000， China
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KUANG Zhiping1KUANG Zhiping
College of Civil Engineering， Tongji University， Shanghai 200092， China
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Affiliation:1.College of Civil Engineering， Tongji University， Shanghai 200092， China;2.Zhejiang Industry Polytechnic College，Shaoxing 312000， China
Clc Number:O389
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Abstract:

In order to study the propagation law of blast shock wave in a flat large space such as underground parking lot， a 2D axisymmetric analysis model was established using AUTODYN software. The propagation characteristics of shock wave after 8 different masses of TNT detonated at the ground in the middle of the flat large space were analyzed. By combining the propagation cloud picture of blast shock wave and the pressure time history curve of some gauges， it is found that the shock wave will form multiple Mach waves in the propagation process， and the height of the Mach stem of the first Mach wave can reach the space net height. The height of the Mach stem of the subsequent Mach wave is small， but the propagation speed is fast， and it will eventually catch up with the first Mach wave， and converge with it. The peak overpressure at the junction is increased compared with other positions of the Mach stem. As the propagation distance increases， the influence of subsequent Mach wave waves on the first Mach wave decreases. The formula for determining the horizontal position of the critical point where the peak overpressure of the Mach wave front is constant and the corresponding maximum peak overpressure value according to the scaled clear height， and the formula for determining the average value of the maximum peak overpressure according to the plane scaled distance are given.

Key words:blast;shock wave;flat large space;Mach wave;overpressure peak

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LIU Zhonghui, KUANG Zhiping. Propagation Law of Blast Wave in a Flat Large Space[J].同济大学学报(自然科学版),2023,51(12):1900~1909

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Received:May 06,2023
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