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Estimating vertical and lateral pressures in periodically structured montmorillonite clay particles
Guillermo A Narsilio1, David W Smith, Peter Pivonka
1Department of Civil and Environmental Engineering, The University of Melbourne Civil Engineering Block, Parkville, Victoria 3010, Australia.
Clay particle interactions under load are simulated using computational micromechanics. Overlapping electrical double-layers generate disjoining pressure, enabling effective stress without direct particle contact.
Area of Science:
- Geotechnical Engineering
- Soil Mechanics
- Computational Micromechanics
Background:
- Montmorillonitic clay soils exhibit complex particle interactions.
- Understanding particle-level responses is crucial for predicting macroscopic soil behavior.
- Analytical solutions are limited for intricate particle arrangements.
Purpose of the Study:
- To investigate particle-level responses of montmorillonitic clay to external loadings.
- To estimate counterion and electrical potential distributions.
- To calculate disjoining pressures and their influence on effective stress.
Main Methods:
- Computational micromechanical models based on Poisson-Nernst-Planck equations.
- Finite element method for simulating particle interactions.
- Van't Hoff relation and Maxwell stress tensor for pressure calculations.
Main Results:
- Increased counterion concentration in micropores as particle distance decreases.
- Overlap of electrical double-layers leads to increased osmotic pressure.
- Disjoining pressure allows particles to carry effective stress without direct contact.
Conclusions:
- Micromechanical modeling provides insights into clay soil behavior.
- Disjoining pressure plays a key role in the load-deformation response of clays.
- This approach may enable theoretical predictions of macroscopic soil behavior.
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