Plane-Strain Instability of Saturated Porous Media
Publication: Journal of Engineering Mechanics
Volume 121, Issue 6
Abstract
Herein we investigate the plane-strain instability of rectangular blocks that are made of porous materials saturated with a fluid. We model the material behavior with rate-type constitutive equations, and study instability generated by the interaction of nearly incompressible solid and fluid constituents. Our investigation, although it applies to a broad range of materials, is limited to hypoelastic and elastoplastic models. Elastoplastic models are found to undergo two-phase instability even though the solid phase remains stable. Two-phase instability is more likely to occur in contractant hardening materials than in dilatant materials. Its emergence is triggered by the solid-fluid interaction, and is delayed by the grain-fluid compressibility. Two-phase instability also takes place in dilatant materials, but is less catastrophic than in contractant materials. The present analysis is useful for distinguishing the physical from the artifical origins of instabilities, which is an important issue in the numerical solutions of soil-liquefaction problems.
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Published In
Journal of Engineering Mechanics
Volume 121 • Issue 6 • June 1995
Pages: 717 - 724
Copyright
Copyright © 1995 American Society of Civil Engineers.
History
Published online: Jun 1, 1995
Published in print: Jun 1995
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