Mechanical Behavior of Porous Geomaterials
Summary
Porous geomaterials encompass rocks, sediments and engineered substrates whose mechanical response is governed by both their solid framework and the network of voids within. Variations in pore geometry, mineralogy and fluid chemistry dictate strength, stiffness and deformation modes under mechanical loading. Key processes include pore collapse, pressure solution at grain contacts and chemo-mechanical coupling that can induce dissolution or precipitation, altering porosity and permeability. Triaxial loading, acoustic monitoring and microstructural imaging have revealed scale-dependent behaviour, from microcrack initiation to field-scale compaction and subsidence. Insights into elastic and plastic regimes, creep under constant stress and rapid failure under dynamic loads inform applications in hydrocarbon extraction, carbon storage, civil foundations and geothermal energy. A unified understanding of pore-scale mechanisms and constitutive modelling is essential to predict performance and mitigate risks in diverse geological and engineering settings.
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Mechanical Behavior of Porous Geomaterials publication trend
The graph below shows the total number of articles in mechanical behavior of porous geomaterials across all publications each year (not limited to Nature Index journals).
Technical terms
Porosity: The ratio of void volume to total volume in a geomaterial, controlling fluid storage capacity and mechanical strength.
Permeability: A measure of the ability of a porous medium to transmit fluids through connected pore spaces.
Pressure solution: A deformation mechanism whereby minerals dissolve at grain contacts under stress and precipitate in pore spaces, leading to compaction.
Triaxial compression test: A laboratory experiment imposing controlled confining and axial stresses on a cylindrical sample to characterise strength and deformation.
Elastic modulus: A parameter quantifying the stiffness of a material in the elastic deformation regime.
Yield stress: The stress threshold beyond which a geomaterial undergoes irreversible, plastic deformation.
References
- Mineral replacement in long-term flooded porous carbonate rocks. Geochimica et Cosmochimica Acta (2020).
- Estimation of macroscopic failure strength of heterogeneous geomaterials containing inclusion and pore with artificial neural network approach. Computers and Geotechnics (2024).
- Impact of uncertainties associated with the choice of the yield stress on the prediction of subsurface reservoir compaction: A field study. International Journal of Rock Mechanics and Mining Sciences (2023).
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