Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 52 for “"soil model"”.
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Development of framework for soil model input parameter selection procedures
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2000.
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Re-analysis of deep excavation collapse using a generalized effective stress soil model
… of the Nicoll Highway have relied on simplified soil models with undrained strength parameters based on empirical correlations and piezocone penetration data. In contrast, the current research simulates the engineering properties of the key Upper and Lower Marine Clay units using a generalized …
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Aspects of the chemistry of lead in multiphase soil model systems and the environment
Synthetic model soils were used to evaluate redistribution of Pb in both the three-stage sequential extraction procedure proposed by the Commission of the European Communities Bureau of Reference (BCR, now Standards, Measurements and Testing Programme) (1993) and the commonly-applied procedure of …
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Implementation and evaluation of a recently developed rate-dependent effective stress soil model 'MIT-SR'
Reliable modeling of rate-dependency in soil properties remains a major challenge for accurate solutions of many geotechnical problems. Although there are many sources of experimental data concerning rate dependent properties of clays, most pre-existing soil models have been found to have severe …
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Application of rate dependent soil model, MIT-SR, for evaluation of long-term ground movements due to consolidation and creep
… predictions of settlements of compressible soil strata are based on results of laboratory element tests on small test specimens. Ladd et al. (1977) show that scaling of laboratory consolidation tests to field scale is strongly affected by assumed creep properties of the clay, leading to …
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Computer analysis of Cross Canyon culvert
… was used in this study. The overburden-dependent soil model was chosen to represent the stress states of the soil in the backfill. The triaxial shear test data were converted into an overburden-dependent soil model and then this converted soil model was modified. The modified soil model was …
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Development of FEA wide-base truck tire and soil interaction models
… Recent advancements in computerized and virtual modeling provided an efficient methodology for accurate prediction of tire characteristics. In this thesis Finite Element Analysis (FEA) is employed as a method to accurately construct a new virtual wide-base tire model, validate it, and then study …
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Stochastic Terrain and Soil Modeling for Off-Road Mobility Studies
… such data directly in the simulation. Dedicated modeling techniques and computational methods that realistically and efficiently simulate off-road operating conditions are thus necessary. Many studies have been recently conducted to identify effective and appropriate ways to reduce experimental …
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A new elasto-viscoplastic model for rate-dependent behavior of clays
… clays in laboratory tests, none of the existing soil models has attained consistent descriptions of the observed strain-rate effects in shearing, or creep and relaxation in compression. This thesis develops a novel elasto-viscoplastic soil model, MIT-SR, to address these limitations. The proposed …
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A computational framework for dynamic soil-structure interaction analysis
… dissertation presents: (i) a simple but general soil model; and (ii) a general computational framework, enabling the development of efficient interactive software for the analysis of dynamic soil-structure interaction problems.With regard to the model, a general, non-associative, elasto-plastic …
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Representation of water table dynamics in a land surface scheme : observations, models, and analyses
… into a land surface scheme LSX, a lumped aquifer model is developed to represent the regional unconfined aquifer as a nonlinear reservoir, in which the aquifer simultaneously receives the recharge from the overlying soils, and discharges runoff into streams. The dependence of groundwater runoff on …
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The mechanical behaviour of soft clays under vibration loading from vehicle traffic
… of soft clays suggest that an overstress type soil model is suitable for the analysis of such deposits. A model initially proposed by P. Perzyna has been extended with the addition of a Cam Clay type yield criterion and implemented in a finite element code to analyze geotechnical problems in …
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Scale effects in tests on footings
… the stress and absolute particle size effects. Model footing tests were also performed by pushing a rigid circular punch axisymmetrically into the flat surface of a cylindrical soil model either under 1-g (gravity) with surcharge or under elevated g in a centrifuge. The 1-g and centrifuge test …
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Two-Dimensional Analysis of Water-Filled Geomembrane Tubes Used as Temporary Flood-Fighting Devices
… tube is assumed to be infinitely long, and it is modeled two-dimensionally. Beam elements are used to model the tube. The tube is inflated with water. The hydrostatic pressure in the tube is converted to point loads and applied at the beam nodes in the direction perpendicular to the chord …
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The application of critical state soil mechanics to predict ground deformations below an embankment constructed on soft alluvium
… construction were found to dissipate rapidly. Soil samples recovered from the site have been tested at city University. The alluvial clay is shown to have extremely variable compression characteristics and it is not possible to determine a single set of critical state soil parameters from the …
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Application of new observational method on deep excavation retaining wall design in London Clay
… by the numerical analysis with the adopted soil constitutive models. Three Crossrail excavation cases are back-analysed by the Mohr-Coulomb model using FEMs from Pseudo-FEM to 2D and 3D FEMs. The Crossrail Tottenham Court Road Station, Western Ticket Hall deep box excavation is also …
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Analysis of large deformation offshore geotechnical problems in soft clay
… element (FE) methods are well established for modeling geotechnical problems in soil masses and soil-structure interaction, most prior research on large deformation problems has been limited to simplified assumptions on drainage conditions and constitutive behavior. This thesis investigates two …
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Methodology for updating numerical predictions of excavation performance
… in site investigations and measurements of soil properties, simplified constitutive models are routinely used in geotechnical analyses for the design of excavation support systems. However, monitoring data provides additional information on the performance of these support systems during …
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Evaluating the capabilities of some constitutive models in reproducing the experimental behaviour of stiff clay subjected to tunnelling stress paths
Accurate prediction of soil behaviour around tunnel excavations is vital for the assessment of its effects on existing infrastructures and services, both underground and surface, and evaluation of risks to enable safe designs. This thesis evaluates the capabilities of four constitutive models in …
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Seismic performance of single-propped retaining walls
… seismic inputs were applied at the base of the model. The non-linear, inelastic soil behavior was represented by the advanced PB constitutive model (generalized effective stress soil model) developed by Papadimitriou et al. (2002). In order to avoid spurious reflections of shear waves on the …
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