Abstract
Due to their various applications in geo-environmental engineering, such as in landfill and nuclear waste disposals, the coupled chemo-hydro-mechanical analysis of expansive soils has gained more and more attention recently. These expansive soils are usually unsaturated under field conditions; therefore the capillary effects need to be taken into account appropriately. For this purpose, based on a rigorous thermodynamic framework (Lei et al., 2014), the authors have extended the chemo-mechanical model of Loret el al. (2002) for saturated homoionic expansive soils to the unsaturated case (Lei, 2015). In this paper, this chemo-mechanical unsaturated model is adopted to simulate the chemo-elastic-plastic consolidation process of an unsaturated expansive soil layer. Logical tendencies of changes in the chemical, mechanical and hydraulic field quantities are obtained.
Highlights
Due to their various applications in geo-environmental engineering, such as in landfill and nuclear waste disposals, the coupled chemo-hydro-mechanical analysis of expansive soils has gained more and more attention recently
Being materials in geotechnical and geo-environmental strongly bonded to the clay particles, this water will not engineering. These clays are sensitive to pore migrate nor evaporate except when subjected to very water chemical compositions and matric suction changes. large forces. They will be Coupled chemo-hydro-mechanical analysis are treated as parts of solid phase
Cl a y pa rti cl e framework [1], were undertaken [2,3,4] to extend the chemomechanical model [5,6] for saturated expansive clays to account for partial saturation and suction effects
Summary
The properties of unsaturated expansive soils are strongly related to their special soil structures. 3.1 Mixture theory and volume fractions clay aggregates, separated by inter-aggregate pores filled by either gas or free water; Water in inter-aggregate pores. The superscript “ ’ ” indicates species that are attached to the solid phase, whereas no superscript is used to refer to species within the fluid phases. Here the exchange between liquid water and water vapour is neglected by assuming that dry air is the only species in the gaseous phase. This three-phase porous medium can be treated as the superposition of three continua, one solid and two fluids. These continua are assumed to simultaneously occupy the entire physical domain but with reduced densities to maintain the overall mass balance. The multi-species porous medium can be treated as the superposition of multiple species continua
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