Protection Performance of Typical Explosion-proof Equipment against Explosion-induced Seismic Waves

Explosion-induced seismic waves have become the main factors inducing secondary disasters such as building collapse and infrastructure damage due to their long wavelength, strong amplitude and fast propagation speed. Based on two kinds of typical explosion-proof equipment, the static explosion tests with different TNT dosages are carried out to study the propagation and attenuation law of explosion-induced seismic waves under three different protection conditions of free-air blast (FAB), steel explosion-proof (SEP) and flexible explosion-proof (FEP). The vibration velocity time-domain responses and main vibration frequency characteristics of SEP and FEP equipment are analyzed. The three-axis peak vibration velocity vector and attenuation models under the protection of SEP and FEP equipment are constructed, and the damage level of building is divided accordingly, which is subdivided into three criteria of safety, slight damage and serious damage. It is found that the vector sum of triaxial peak vibration velocities increases with the increase of TNT charge, and decreases with the increase of detonation distance. The triaxial dominant frequency shows no obvious change rule when the detonation distance or TNT charge increases. Compared with FAB, both SEP and FEP show significant protection performance against the triaxial peak vibration velocity of explosion-induced seismic waves. The research results can provide reference for the structural design of related explosion-proof equipment and the evaluation of explosion-induced seismic wave protection effectiveness.