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 34 for “"Geomaterials"”.
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Permeability modifying processes : thermal cracking and crack healing of geomaterials
… for change in porosity and permeability of geomaterials: thermal cracking and crack healing by diagenesis. A suite of thermal cracking experiments was performed on andesite plugs from the geothermal field in Awibengkok, Indonesia. Permeability (k) and specific storage capacity were measured …
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Nanoindentation characterization of clay minerals and clay-based hybrid bio-geomaterials
… for seismic study, stability of parent rocks and geomaterials, and for geophysical subsurface exploration. Recently, growing prospects of clay based nanocomposites have renewed further interest in understanding the fundamental elastic and plastic properties of hydrous aluminosilicates. Their …
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Finite deformation of particulate geomaterials: frictional and anisotropic Critical State elasto-plasticity
This thesis is concerned with the theoretical development and numerical implementation of efficient constitutive models for the analysis of particulate media (specifically clays) in structures undergoing geometrically non-linear behaviour. The Mohr-Coulomb and modified Cam-clay constitutive models …
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Two-Dimensional Finite Element Analysis of Porous Geomaterials at Multikilobar Stress Levels
… and developing mechanical properties for porous geomaterials subjected to the high pressures encountered in penetration and blast-type loadings. A finite element (FE) code was developed to verify laboratory test results or to predict unavailable laboratory test data for porous media loaded to …
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Investigating Linkages Between Engineering and Petrophysical Properties of Unconsolidated Geomaterials and Their Geoelectrical Parameters
… factors controlling the engineering behavior of geomaterials (earth materials) and their measurable electrical parameters. This research work therefore sets out to investigate the linkages between engineering and petrophysical properties of geomaterials and their geoelectrical parameters. This …
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Trapdoor experiments on the centrifuge--a study of arching in geomaterials and similitude in geotechnical models
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Civil Engineering, 1991.
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Modélisation de la transition solide-fluide dans les géomatériaux. Application aux glissements de terrain.
Geomaterials are present in nature in many forms : solid soil or rock, soft clay, almost liquid mud, etc. Geomechanics deals with the understanding the solid behavior of geomaterials. However, solid ground can happen, under specific external conditions, to turn into fluid : as for example during …
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Numerical analysis of homogenization using random finite element method
The homogenized stiffness and permeability of geomaterials that are highly variable at the micro-scale has long been of interest to geotechnical engineers. This is especially true in petroleum geomechanics, where there has been a rapid growth of interest in the mechanics of unconventional resource …
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Invariant mechanical properties of calcium-silicate-hydrates (C-H-S) in cement-based materials : instrumented nanoindentation and microporomechanical modeling
Random porous solids such as bone and geomaterials exhibit a multiphase composite nature, characterized by water-filled pores of nm- to m-scale diameter. The natural synthesis and operating environments of such materials significantly alters phase composition and multiscale structural …
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Geotechnical Problems with Pyritic Rock and Soil
… communication regarding problems with pyritic geomaterials. Thus, there is a need to establish an inter-disciplinary and inter-regional awareness regarding the effects of pyrite oxidation and their prevention or mitigation. This engineering research is a compilation of information about …
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Long-term response of soils subjected to repetitive geoenvironmental loads
… of repetitive environmental loading cycles on geomaterials. Research tools adopted in this study include long-term experiments in multi-physics cells, microfluidics, seismic and NMR monitoring, and analytical solutions. The void ratio evolves towards the terminal void ratio as the number of …
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Simulating complex conductivity in carbonate rocks: using digital carbonate rocks and comparison to laboratory measurements
… involves the modern microscopic imaging of geomaterials, digitalization of the microstructure, and numerical simulation of physical properties of rocks. This physics-based approach can give important insight into understanding properties of reservoir rocks, and help reveal the link between …
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Influence of some particle characteristics on the small strain response of granular materials
… representing the small strain response of geomaterials are the very small strain shear modulus, Gmax, shear modulus degradation G/Gmax, and damping ratio. These are also important parameters in the design of foundations where only small deformation takes place. A review of the literature …
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Three-Dimensional Finite Element Analysis of Flexible Pavements Considering Nonlinear Pavement Foundation Behavior
… and deformation behavior of pavement foundation geomaterials, i.e., fine-grained subgrade soils and unbound aggregates used in untreated base/subbase layers, due to repeated wheel loading. This nonlinear behavior is commonly characterized by stress dependent resilient modulus material models that …
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Effect of sample disturbance in opalinus clay shales
The sample disturbance problem for different geomaterials is reviewed in this thesis. A general discussion on the disturbance sources and complexities of the disturbance problem is followed by detailed reviews on disturbance mechanisms and effects in soil and rock. This investigation leads to the …
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The effect of the packing density on the indentation hardness of cohesive-frictional porous materials
… test in situ phase properties and structures of geomaterials that cannot be recapitulated ex situ in bulk form. But it requires a rigorous indentation analysis to translate indentation data into meaningful mechanical properties. The development and implementation of such an indentation analysis …
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Molecular Dynamics Simulation of Forsterite and Magnesite Mechanical Properties: Effect of Carbonation on Comminution Energy
… into the effects of mineral carbonation on geomaterials contributes to our understanding of how these minerals behave under different conditions and could have implications for various industries.
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A constitutive model for the compression behavior of Old Alluvium
… tropical soil, and represents a class of geomaterials that have a complex microstructure, including cemented aggregates at the meso-scale and groups of clay stacks at the micro-scale. Despite the presence of significant fractions of nontronite (smectite species), the activity of charged …
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