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Showing 1 to 20 of 44 for “"Unsaturated Soils"”.
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The shear strength of unsaturated soils
Summary; p. xi-xiii.
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Soil-pipeline interaction in unsaturated soils
… Though pipelines are generally buried in unsaturated soils, the design guidelines are based on the assumption that the soil is either dry or fully saturated. For certain geotechnical problems, this assumption may not be acceptable because the water meniscus formed between soil particles …
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THEORETICAL DETERMINATION OF THE YIELD CURVE FOR UNSATURATED SOILS
… a good understanding of the behavior of unsaturated soils is to adopt a formal and simple constitutive framework and to conduct high-quality and short-time experiments. Barcelona Basic Model (BBM) was the first elastoplastic constitutive model for unsaturated soils. The yield curve, which …
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The Relationships Between the Volumetric Deformation Moduli of Unsaturated Soils
… the first international forum which brought unsaturated soil problems to the attention of geotechnical engineers. Since then, the understanding of unsaturated soil behaviour has been improved considerably. The theory for the volume change and shear strength behaviour of unsaturated soils has …
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Coupling of mechanical behaviour and water retention behaviour in unsaturated soils
… behaviour and water retention behaviour in unsaturated soils at a constitutive level, with degree of saturation (in addition to suction) influencing mechanical behaviour and volumetric strains influencing water retention behaviour. An innovative elasto-plastic modelling framework …
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Peridynamic Modeling of Coupled Mechanical Deformations and Transient Flow in Unsaturated Soils
… deformations and transient moisture flow in unsaturated soils is developed. The model is capable of simulating the emergence and evolution of cracks triggered by volumetric strains in the soil which are associated with changes in moisture content. The development of our model is motivated by …
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Evaluation and Laboratory Measurement of the Coefficient of Permeability in Deformable, Unsaturated Soils
… the coefficient of permeability function for unsaturated soils. The research program commenced with a literature review on the coefficient of permeability function. The permeability function for a constant volume porous medium was categorized into empirical equations, macroscopic models and …
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Application of stochastic methods to transient flow and transport in heterogeneous unsaturated soils
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Civil Engineering, 1990.
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Simple Techniques for the Implementation of the Mechanics of Unsaturated Soils into Engineering Practice
… made in the research area of the mechanics of unsaturated soils. These advancements can be categorized into two groups; (i) development (or improvement) of testing techniques (or apparatus) to determine the mechanical properties of unsaturated soils and (ii) development of (numerical, empirical …
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A THREE-DIMENSIONAL FULLY COUPLED HYDRO-MECHANICAL ELASTO-PLASTIC MODEL FOR UNSATURATED SOILS WITH CONSIDERATION OF HYSTERESIS BEHAVIOR
<p>"Unsaturated soils are often used as a construction material in transportation infrastructures; in which it is subjected to cyclic traffic loadings and/or seasonal wetting-drying cycles. While mechanical hysteresis is a common feature of soils in general, hydraulic hysteresis is associated with …
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A structure from motion photogrammetric method for continuously measuring and tracking the deformations of soils during triaxial testing
… the stress-strain behavior of both saturated and unsaturated soils. The total and local deformations and volume changes of a soil specimen are indispensable parameters that need to be measured and are of great significance for understanding volume change and shear strength characteristics of the …
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Effects of anisotropy on the behaviour of unsaturated compacted clay
… have been proposed to model the behaviour of unsaturated soils. Many of the models were developed on the basis of the modified Cam Clay theory for saturated soils. However, the elasto-plastic models for unsaturated soils were validated based on the data obtained from samples prepared one …
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Effects of soil moisture, soil carbonate and organic matter content on vapor phase sorption of volatile organic compounds using inverse gas chromatography
Sorption of VOCs from the vapor phase to soils is an important variable in predicting VOC contaminant movement in unsaturated soils. Experiments were performed which evaluated the effects of soil moisture, carbonate, and organic matter content on VOC sorption. Sorption measurements were performed …
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Measurement of Soil and Water-Quality Parameters to Understand Subsurface Transport Processes
… the flow and transport dynamics in saturated and unsaturated soils. In the first phase of this study, we have focused on understanding the impacts of climate change driven hydrological processes such as excess rainfall and/or draught cycles on saltwater intrusion processes with a focus on managing …
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Liquefaction Potential of Unsaturated Nevada Sand Considering Different Intial Conditions
… assumed that liquefaction does not occur in unsaturated soils during seismic events, because pore air behaves as a cushion and excess pore water pressure is difficult to accumulate. During recent earthquakes, some slopes composed of unsaturated soils experienced large deformation similar to …
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Αναλυτική επίλυση μη γραμμικών προβλημάτων διήθησης
… ONE DIMENSIONAL HORIZONTAL WATER ABSORPTION IN UNSATURATED SOILS WITH CONSTANT FLUX BOUNDARY CONDITION. THE GENERAL DIFFERENTIAL EQUATION OF THE ONE DIMENSIONAL UNSATURATED FLOW IS FORMED HAVING THE FLUX AS DEPENDENT VARIABLE WHILE THE TIME T AND THE MOISTURE Θ ARE THE INDEPENDENT VARIABLES. …
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Contribuição ao estudo da resistência não-drenada e secagem dos solos compactados em laboratório das áreas de empréstimo da barragem Palmar
The undrained shear strength of compated, unsaturated soils as determined triaxial tests with the relationship K=σ3/ σ1 = constant lead to two realationships: the first related with the parameter (e√S)o at the beginning of the test and the second with the sarne parameter (e√S)£ at failure. The …
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