During an earthquake, SH-waves propagate through the Earth’s crust, causing the
advancement of localized stress concentrations, or punches, within the rock
medium. This progression results in substantial stress accumulation around
the moving punch, threatening the stability of geological formations and
human-made structures, potentially leading to structural failure. Therefore,
analysis of stress concentration caused by the punch driven by SH-wave
propagation is crucial in seismological studies. Owing to it, this paper presents an
analytical framework to investigate the influence of punch velocity, driven
by SH-wave propagation, on the dynamic stress concentration (DSC) in
prestressed transversely isotropic double poroelastic (TIDP) rock media. A
closed-form expression for DSC under constant force intensity is derived
using the Wiener–Hopf technique, alongside Galilean and two-sided Fourier
integral transformations. The analysis reveals the profound impact of various
factors including punch velocity, porosity, anisotropy, initial horizontal and
vertical compressive/tensile stresses, and frequency parameter, on DSC.
Numerical computations and graphical illustrations for TIDP rock media
highlight the significant effects of these parameters. Results indicate that
increasing punch velocity amplifies DSC in double poroelastic media. A
comparative analysis of the influence of porosity on DSC across three poroelastic
rock media — transversely isotropic double poroelastic (TIDP), transversely
isotropic single poroelastic (TISP), and isotropic double poroelastic (IDP) — is
graphically presented. The outcomes of present study highlights distinct
characteristics of DSC in each medium, providing valuable insights into stress
concentration behavior under dynamic seismic conditions. Moreover, key
characteristics and unique insights into the derived DSC expression are also
discussed.
