Parametric Study of Surface Response Spectra of Elastic Half-Spaces under Two Surface Explosions with Spatial Distance and Time Delay

Modeling of elastic half-spaces and wave propagation within half-spaces under dynamic impulse loading has numerous applications namely designing of structures. In explosion topics with respect to the pursued purpose, multiple explosions can be replaced by one explosion. So this research deals with the effect of two explosions and determining the critical zones for various goals. This study deals with wave propagation in soil half-spaces considering on the ground structures. Structural analysis is the first step for designing structures. Therefore, the study of soil media responses under the surface structure is the goal of present research. The 3D elastic half-space with absorbing boundaries under two surface explosions is modeled using ANSYS finite element software. The surface responses are correlated to loading through a parametric study varying spatial distance and time delay of two similar blasts. Spatial distance and time delay are analysis parameters. Model responses determined in this study are: displacement, velocity and acceleration spectra (surface responses). In summary, surface responses show, peak of the double blast spectra occurs in smaller periods than single blast, also by increasing spatial distance, peak of the double blast spectra occurs in larger periods. Comparing spectra reveal second blast has minimum effect on surface spectra and maximum effect on acceleration spectra.