Experimental and overpressure simplified computational study of underground straight-wall arch structures under internal explosions
Aiming at the issue of internal explosions in underground straight-wall arch structures with end walls and large doors sealed,this study investigates the variation rules of shockwave overpressure through the internal ex-plosion of reduced scale structure.The research covers different equivalent explosives and locations.Simulation re-sults generally align with test data,revealing that the arrival time of the shockwave is positively correlated with the explosive distance,meaning a shorter distance results in faster arrival times.The peak overpressure values at loca-tions such as side walls and arch tops rapidly decay with increasing scaled distance,following the exponential decay law of explosive shockwaves.Through comprehensive comparisons of internal explosion test data,simulation analy-sis results,and relevant empirical standards,a simplified calculation formula for shockwaves peak overpressure of internal explosion is proposed.The study demonstrates that this formula effectively reveals the rules of shockwaves in internal explosive events within the structure.
underground straight-wall arch structureinternal explosion testshockwave overpressuredynamic fi-nite element