ABSTRACT
In recent years, to understand the prediction model for amplitude-frequency characteristics, natural hazards due to explosion, the effects of underground explosions on soil and structure, pressure distribution from explosives buried have been studied. The authors consider the large explosion within a spherical cavity situated in an infinite, homogeneous, isotropic, and perfectly elastic medium. They also assume that the entire medium including the boundary of the cavity is at rest just before the explosion. So the effect of explosion produced melting, vaporization, crushing of the material, and very high stresses. The outer boundary of the nonelastic region, which is also the inner boundary of the elastic regions would start expanding immediately after the explosion. During the explosion, the elastic region would be under large outward stresses across the elastic-nonelastic boundary. In their model they obtained an exact solution in closed form for the displacement in the elastic medium for a spherical source, expanding with a decelerated velocity.
