Simulation Techniques for the Prediction of Blast from Underground Munitions Storage Facilities

摘要

Results are presented from a series of shock tube and 1:50 scale model high explosive (PETN) tunnel tests, designed to simulate underground chamber/tunnel explosions. Models consisted of straight and smooth chamber/tunnel configurations with converging area changes. Experimental data are compared with predictions from a modified INBLAST computer code to which was added the blast wave propagation along the tunnel. Modifications were made either by the addition to INBLAST of shock tube equations for converging area change at the diaphragm, or by addition of the BRL-Q1D one-dimensional hydrocode. Effects of baffle induced tunnel area changes were included in the hydrocode when needed. Otherwise, the algebraic shock tube equations were used. The field test, in addition to internal blast pressure, measured the exit field pressures as a function of the chamber charge loading density. The free-field blast pressure was measured as a function of radial distance and angle of propagation with respect to the tunnel's long axis. Airblast; Blast suppression; Munitions storage; Tunnel attenuation; Baffles; Converging area; Overpressure; Blast waves; Exit blast; Shock tube; Underground storage. (mjm)