Poro-acoustoelastic constants based on Padé approximation.

摘要: Stress-induced velocity variations for porous rocks are generally characterized by a strong nonlinear dependence on stress associated with complex deformations under loading. The classical theory of poro-acoustoelasticity high-order elastic constants is based the Taylor expansion strain energy function, encountering problems divergence and limitless wave velocities in describing stress-associated variations, especially high effective stresses. extension beyond Pade approximation to function addressed this article. resultant acoustoelastic characteristics reasonable theoretical limit increasing stresses, avoiding some such as decreasing moduli pressure at pressure, possibly implying microstructural e...