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Description
This paper comprehensively investigates the elastic behavior of fluid-saturated porous media, particularly under varied stress and pore pressures. We use a Linear Superposition Method (LSM) to quantify stress distribution and effective bulk moduli within a synthetic micropore model under both drained and undrained conditions. Our results reveal a significant nonlinear stiffening effect, particularly at high pore pressures, where the bulk modulus increases with porosity—in some cases by up to 25%. This behavior deviates from predictions made by conventional poroelasticity theories relying on a priori upscaling methods. Our posteriori upscaling approach highlights the limitations of these macroscopic approaches, which often overlook critical microstructural details such as pore size distribution, pore pressure effects, and localized stresses. These findings suggest poroelasticity is better understood as a nonlinear, pore-scale phenomenon rather than an inherent material property. We therefore propose a practical method for upscaling micropore model results into an analytical expression, with direct applications in geomechanics and reservoir engineering.
| Country | South Africa |
|---|---|
| Water & Porous Media Focused Abstracts | This abstract is related to Water |
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