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Showing 1 to 20 of 52 for “"Unsaturated soil"”.
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Yielding of unsaturated soil.
… understanding of the mechanical behaviour of unsaturated soils in terms of elastoplastic critical state constitutive models. These models are defined in terms of four independent stress state variables : mean net stress, deviator stress, suction and specific volume. An important feature of the …
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Unsaturated Soil Compaction by Different Stress Paths
Made available in DSpace on 2014-12-11T17:36:06Z (GMT). No. of bitstreams: 1 7219864.pdf: 3434175 bytes, checksum: 95dcfdd7a5b8e0ca845b18061abf37c2 (MD5) Previous issue date: 1972
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A study of infiltration trenches in unsaturated soil
… here is a study of infiltration trenches in unsaturated soil. The infiltration rates and the water content distributions in soil calculated by Fok's model and a finite-difference model are compared for both the Ida silt loam soil and the Webster clay loam soil considering the capillary zone …
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Preferential flow in vertically oriented, unsaturated soil layers
… preferential flow and the flow of water through unsaturated soils. Unfortunately, the research has been completed by different disciplines of science and engineering, resulting in a wide range of terminology and research objectives. A field program conducted during the excavation of a large waste …
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Thermal gradients and water transfer in unsaturated soil.
An investigation into the flux of soil water under the influence of a thermal gradient was conducted in closed soil systems in the laboratory. A thermal gradient was imposed across the sandy loam soil columns and measured continuously for the duration of the experiment. The movement of soil water …
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Transient flow of water in saturated-unsaturated soil profiles
… water, during tile drainage process in saturated-unsaturated soil profiles, was studied. Drainage experiments were performed on two different soil profiles. The first experiment undertaken was tile drainage of a vertical column of sand. This experiment was performed on two sands of differing grain …
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The Impact of a Planar Drainage Geocomposite in Unsaturated Soil
… in geoenvironmental systems characterized by unsaturated soils subject to occasional significant precipitation events has been a subject of concern as practitioners look for improved methods to reduce pressures and divert water from foundations, mechanically stabilized earth structures, cover …
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Compaction of an Unsaturated Soil Under a General State of Stress
Made available in DSpace on 2014-12-09T20:03:08Z (GMT). No. of bitstreams: 1 6915295.pdf: 3234719 bytes, checksum: a8ece545d007a06c730f8babceceb62e (MD5) Previous issue date: 1969
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Three-Dimensional Stress-Strain Relationships of Unsaturated Soil Under Different Stress Paths
Made available in DSpace on 2014-12-14T06:37:10Z (GMT). No. of bitstreams: 1 8004205.pdf: 6642201 bytes, checksum: e04a47a968f3fd304bcb3a9fc905b753 (MD5) Previous issue date: 1979
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Water Flow in an Unsaturated Soil With a Step-Type Initial Water Content Distribution
Made available in DSpace on 2014-12-10T17:12:26Z (GMT). No. of bitstreams: 1 6604206.pdf: 4419609 bytes, checksum: 70dd8e81403b07970c7d54500a64bb97 (MD5) Previous issue date: 1965
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Assessment of the impact of climate change on an instrumented embankment: an unsaturated soil mechanics approach
… comprises embankments and cuttings built with soil material in an unsaturated state that is exposed to the climate. The BIONICS project (BIOlogical and eNgineering Impacts of Climate change on Slopes) aims to investigate how climate change will affect the serviceability and safety of earth …
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The Relationships Between the Volumetric Deformation Moduli of Unsaturated Soils
The International Conference on Soil Mechanics and Foundation Engineering in 1936 was perhaps 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. …
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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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ΕΠΙΛΥΣΗ ΠΡΟΒΛΗΜΑΤΩΝ ΚΙΝΗΣΗΣ ΤΟΥ ΕΔΑΦΙΚΟΥ ΝΕΡΟΥ ΚΑΙ ΤΩΝ ΔΙΑΛΥΜΕΝΩΝ ΟΥΣΙΩΝ ΜΕ ΜΕΘΟΔΟΥΣ ΠΕΠΕΡΑΣΜΕΝΩΝ ΣΤΟΙΧΕΙΩΝ
… AND SOLUTES IN A ONE-DIMENSIONAL SATURATED-UNSATURATED SOIL PROFILE WITHMETHODS OF FINITE ELEMENTS. THE NUMERICAL SOLUTIONS ARE BASED UPON FOUR FINITEELEMENT SCHEMES: A) THE STANDARD GALERKIN METHOD (SGM), B) THE MASS LUMPING FINITE ELEMENT METHOD (MLGM), C) THE SIMPLE MASS LUMPING FINITE …
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Modelagem hidrológica unidimensional para um local da Amazônia
… of Darcy’s equation for the water flux in an unsaturated soil. The parameters of the model have a physical meaning and can be determined in field investigations. The model was used to simulate the Reserva Ducke’s water balance in its actual condition, covered by the forest. This model was …
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Modeling transport of agricultural chemicals in a dual porosity system resulting from macropores
… flow and reactive chemical transport in both the soil matrix and the macropore region. Flow of water in both regions is governed by Richards' equation and chemical transport is based upon convective-dispersive mechanisms with linear kinetic sorption and first-order decay. The pressure-water …
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The mechanisms involved during the desaturation process of a porous matrix
Traditionally, soil mechanics deals with soil in either of two states, saturated or dry. The effective stress concept proposed by Terzaghi has proven to be valid for soils in either of these states. However, when the water or air phase becomes large enough, the soil no longer behaves as two-phase …
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Modeling a bender element test using Abaqus Finite Element Program
… hold promise for modeling the behavior of an unsaturated soil specimen subjected to bender element agitation. The immediate objective of this research project is to reproduce a bender element test using Abaqus Finite Element Software assuming elastic and isotropic conditions. Extensive …
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Modeling the relation between suction, effective stress and shear strength in partially saturated granular media
… strength and deformation characteristics) of soils are related to soil's "effective stress", i.e. the stress carried by the solid matrix. The remaining stress is carried by the pore fluid in the form of pore pressure. In unsaturated soils, the coexistence of water and air results in negative …
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The Behavior of Pore Water Pressure in Cohesive Subgrade Soils
… of pore water pressure in subgrade cohesive soils under Falling Weight Deflectometer (FWD) tests. The deflection of a pavement structure largely depends on the deformation of subgrade soils, which is in turn dependent upon soil stiffness. Soil stiffness can be characterized by the resilient …
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