Viscoplasticity and large strain consolidation modelling with converging isotaches
Viscoplasticity and large strain consolidation modelling with converging isotaches
Large strain consolidation models are widely used for prediction of soft soil behavior in hydraulic filled reclamations. Large strain models typically consider an elastoplastic response with time independent constitutive relations for both permeability k(e) and compressibility e(σ’). This approach may be insufficient for soft soils subject to long consolidation times for which time dependent effects of soil are more prominent. Based on long-term column settling tests on kaolinite clay it is observed that incorporating time dependent effects (viscoplasticity) with the isotache theory improves the large strain model predictions significantly. The tests suggest changes on the amount of viscoplastic strain at high void ratio, leading to non-parallel (converging) isotaches. Therefore, a large strain converging isotache model is developed for better predictions of both settlements and pore pressures of soft soils.
Thomas Vergote; Y. Devrieze
18th European Conference on Soil Mechanics and Geotechnical Engineering (ECSMGE2024)
E - Environment, water and energy
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