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 26 for “"volumetric strain"”.
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Development of a volumetric strain influence ground improvement prediction model with special reference to impact compaction
… the surface settlement is monitored, providing strains are taken into account.
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Finite element analysis of multipass effects of vehicles on soil compaction
… an equivalent circular area. A hyperbolic stress-strain relationship was used to model the nonlinear material characteristics of the soil. The boundary load conditions were based on contact area and contact pressure data for a standard tire. The finite element program developed was verified by …
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Temperature and Axial Strain Rate Effects on Micromechanical Behavior in Triaxially Compressed Marbles
… of high resolution, simultaneous stress-axial strain, volumetric strain, and acoustic emission measurements were used to survey the effects of temperature (T) and axial strain rate ((epsilon)) variations on micromechanical behavior in triaxially compressed marbles. Thirty-five tests were run on …
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Mechanics of large-strain deformation of particle-modified polymers
… or porosity. The deformation to large strains of particle-modified thermoplastic polymers is investigated. Blends with rubber particles and blends with calcium carbonate particles are considered. A novel experimental technique is utilized to characterize the three-dimensional …
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ESTIMATION OF DIFFERENT COAL COMPRESSIBILITIES OF COALBED METHANE RESERVOIRS UNDER REPLICATED IN SITU CONDITION
… that is, the reservoir is under uniaxial strain conditions. Simultaneously, experimental work was carried out replicating these conditions. The results showed that the matrix volumetric strain typically follows the Langmuir-type relationship. The agreement between the experimental results …
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PRELIMINARY EXPERIMENTAL AND MODELING STUDY OF PRESSURE DEPENDENT PERMEABILITY FOR INDONESIAN COALBED METHANE RESERVOIRS
… with depletion and the corresponding volumetric strain of coal were measured in the laboratory under uniaxial strain condition (zero lateral strain). Two gases, helium and methane, were used as the flowing fluids during experimental work. The results showed that, decreasing pore …
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An experimental investigation into the stress-dependent mechanical behavior of cohesive soil with application to wellbore instability
… stress level, stress history, and cavity volumetric strain rate. This testing program has been performed using small and large TWC devices with outer diameter, Do=7.6cm and 15.2cm, respectively. Both devices allow for independent control of the vertical stress and the radial pressures …
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Designing against failures resulting from static and time-varying loading in thick-walled components made of ductile cast iron
… multiaxial fatigue is explored through volumetric Strain Energy Density approaches, with particular emphasis on meanstresses and out-of-phase loadings. Simplified frameworks are presented for industrial application, alongside detailed formulations for complex analyses. Insights and …
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Poroelastic properties of carbonates: a case study on Indiana limestones
… include porosity, permeability, static strain, ultrasonic P- and S-wave velocities. In a process, I estimate dynamic and static stiffnesses of carbonates as they often differ due to various effects, such as velocity dispersion, heterogeneity of the rock, and amplitudes of applied strain. …
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Monitoring and Imaging Seismic Velocity Changes Across Temporal and Spatial Scales
… to detect tidally-induced deformation (volumetric strain ∼ 10-8, dv/v ∼ 10-4) with ∼ hourly time resolution. I further extend the applications of noise-based monitoring by not only detecting the temporal changes but also imaging the spatial variations of dv/v. Based on the spacetime dv/v …
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Case Study: Settlement at Nepal Hydropower Dam during the 2014-2015 Gorkha Earthquake Sequence
… compression is the accrual of contractive volumetric strain in sandy soils during earthquake shaking for cases where the generated excess pore water pressures are low. The purpose of this case study is to investigate the settlements of the dam intake block relative to the right abutment …
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Numerical simulation of viscoelastic buckle folds: Implications for stress, fractures, porosity and fluid flow
… provides a detail research on the stress and strain distribution in the multilayer folds and it is concluded that the stress/strain state within the folding layer(s) are determined by the buckling process, fold geometry and material parameters. The second topic covered in this dissertation is …
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MATERIAL PROPERTIES OF AORTA FROM BIAXIAL OSCILLATORY TESTS
… research was to characterize the stress-strain relationship of aorta in dynamic oscillatory biaxial loading. A setup was developed that supplied pressure loading from the physiological to sub-failure levels (between 7 and 76 kPa) to porcine aorta at frequencies ranging from 0.50Hz to …
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Utilizing Changes in Repeating Earthquakes to Monitor Evolving Processes and Structure Before and During Volcanic Eruptions
… eruptions, are thought to occur in response to volumetric strain and the opening or closing of cracks in the subsurface. We compared continuous records of velocity change against other geophysical data, and found that velocities at Mount St. Helens change in response to snow loading, fluid …
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Development of an Internal Camera-Based Volume Determination System for Triaxial Testing
<p>Accurate measurement of axial, radial, and volumetric strain parameters are critical to the understanding of phase relationships and the constitutive behavior for saturated and unsaturated soils. The use of photographic monitoring techniques for laboratory-based measurement of these parameters …
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The behaviour of sand at low stress levels in the simple-shear apparatus
… rise to large underestimates of both stress and strain quantities measured at the boundaries. The causes of this non-uniform behaviour are investigated and the major fault is found to lie in the weak contact between sand grains at the top of the sample and the upper boundary of the sample …
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Stress disturbance on the cyclic behavior of soils and its impact on geotechnical structures
… under undrained condition to reveal the axial strain and excess pore water pressure accumulations, and the tests on sand are carried out under drained condition to investigate the axial and volumetric strain accumulations. The stress disturbance is simulated by changing the radial and axial …
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The Impact of soil structure and confining stress on the permeability of clay soils in brine environments
… be related to the control of horizontal osmotic volumetric strain within the soil. The two sample failure criteria, based on the release of (R-A) and loss of confining stress in soils after brine permeation, seem to provide a simple and effective approach to predict the onset of permeability …
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Towards monitoring volcanoes in Iceland and Hawai’i with seismic velocity variations
… and increases, respectively. Modelling of strain at Kīlauea suggests that, during inflation of the shallow magma reservoir (1 to 2 km below the surface), most of the edifice is dominated by compression - hence closing cracks and producing higher velocities - and vice versa. In central …
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Long-term ground response For borehole heat exchangers in clay
… models and can describe the accumulation of volumetric strain due to cyclic heating and cooling. Irreversible deformations in the TTS model are simulated through the conversion of bound to free water, a process that has been studied via laboratory measurements of specific gravity variations …
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