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 66 for “"Critical State"”.
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Finite deformation of particulate geomaterials: frictional and anisotropic Critical State elasto-plasticity
… family of models which embraces the concept of a Critical State is then developed. This family is extended to include inelastic behaviour within the conventional yield surface and a Lode angle dependency on the anisotropic yield function which maintains convexity of both the surface and uniqueness …
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Development of a New Ring Shear Apparatus for Investigating the Critical State of Sands
… behavior of sands pertinent to liquefaction and critical state soil mechanics using an improved ring shear apparatus designed and constructed at the University of Illinois. Undrained/constant volume and drained triaxial compression and ring shear tests (sheared to about 30 m of shear …
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The application of critical state soil mechanics to predict ground deformations below an embankment constructed on soft alluvium
… it is not possible to determine a single set of critical state soil parameters from the "undisturbed" soil samples. The use in design of parameters derived from reconstituted soil samples is investigated. Laboratory test results indicate that a small quantity'of organic matter in the soil has a …
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Effects of maximum particle size and sample scaling on the mechanical behavior of mine waste rock; a critical state approach
… (p') in a large-scale triaxial device. Intrinsic critical state parameters were defined for each material in conventional scale triaxial testing. Results suggest the parallel gradation technique provides a reasonable way to estimate values of intrinsic critical state parameters during isotropic …
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The critical state of Global Citizenship Education (GCE) in Initial Teacher Education (ITE): an exploration of student teachers’ initial understandings of and experiences with, a ‘praxis’curriculum design to promote greater inclusion, equality and active participation in global democratic societies
… societies. Theoretically, it posits that critical engagement with foundational theories enables student teachers to navigate so-called ‘sensitive’ issues such as racism, gender discrimination, and class inequality, fostering democratic competencies in themselves and their students (Freire, …
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The determination of soil parameters for design from stress path tests
… of an anisotropic soil within the context of critical state soil mechanics. The soil tested is a heavily overconsolidated Gault Clay. Laboratory triaxial testing on 38 mm samples is used to measure and soil 100 mm diameter stiffness. A microcomputer-based control system has been developed for …
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New evidence for flux cutting in type II superconductors.
… from the predictions of the "classical" critical state framework (no flux line cutting). Measurements of the concurrent evolution of $\langle B\sb{z}\rangle \sb{wall}$, the axial flux density threading the wall of the hollow cylinder, complement the above data. The behaviour of $\langle …
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The behaviour of clay in simple shear and triaxial tests
… of this work is to study the applications of critical state soil mechanics to simple shear testing. The problems with the simple shear apparatus and the approach for interpreting simple shear test results are described. Laboratory tests were conducted using the NGI simple shear apparatus, …
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Flux pinning in superconducting Pb-Na
… in the bulk and on the surface in the mixed state. The apparatus used to measure the a.c. flux penetration into a Pb-Na cylindrical single crystal is described together with the experimental techniques employed. The measurements of other workers on the Pb-Na system are reviewed and the …
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The influence of salinity on the mechanical behavior of high plasticity soils
… in both normalized undrained shear strength and critical state friction angle of GOM El with increasing stress level were observed, corresponding with an increase in the value of KO. An increase in shear strength and critical state friction angle was observed with increasing salinity at a …
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Mechanical behaviour of compacted decomposed granite soil
… that the soil conforms to the basic features of critical state soil mechanics, although particle crushing takes place during loading. A unique normal compression line, critical state line and the state boundary surface have been identified. This verifies the application of critical state soil …
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Exploration of fault tolerance in Apache Spark
… for batch processing. The driver program stores critical state of the running job by maintaining oversight of the workers; failure of the driver program always results in loss of all oversight over the worker nodes and is equivalent to catastrophic failure of the entire Spark application. In this …
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Constitutive modelling of the behaviour of clays under cyclic loading
… on an understanding of the soil response and the critical state theory provides a description of the soil response which then be formulated in terms of plasticity theory. A literature review showed that there is a shortage of information on the behaviour of soils under cyclic loading. Constitutive …
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Magnetic flux flow and fluctuation effects in thim film superconductors
Critical state measurements of single and binary thin film systems have been measured as a function of transport current density, magnetic field, temperature, and degree of annealing. Results are interpreted in terms of the present understanding of the mixed state in thin films. Studies of vorteK …
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Sistema automático de aquisição de dados para ensaio triaxial
… fill. Test results are analised in the ligth of critical state soil mechanics theory. This is hoped to contribute to the back calculation of the sanitary fill failure.
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Shear behaviour and stiffness of naturally cemented sands
… which account only for the stress-volume state of the soil. The objective of the research was to compare the shear behaviour and stiffness of two naturally cemented sands: a calcarenite with relatively low densities, weak particles and strong bonding and a silica sandstone with high …
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Rate-Dependent Behavior of Clay
… constitutive model for clays based on the critical-state soil mechanics. The model reproduces the mechanical response of clays under multi-axial loading conditions and predicts both drained and undrained behaviors at small and large strains. Model parameter values are determined for Boston …
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Considerações sobre ensaios triaxiais em areias
This work iniciates with presentation of a state of the art on testing techniques employed in drained triaxial tests on sands. A study of a new method of specimen preparation using pluviation, where the unit weight of the sample can be previously specified, is also presented. ln addition, a …
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Some applications of Cam-clay in numerical analysis
… to investigate the relative importance of the critical state soil parameters and streis history on the calculated soil behaviour. The values of these parameters covered the range of most commonly occurring natural soils. The investigation was extended to finite element modelling of plate …
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Perturbation studies of excitable media
… (BZ) reaction. One is self-organized criticality and the other is periodic forcing and how they can be studied with the BZ reaction. Self-organized criticality is the ability of a system to organize itself into a critical state as a response to random perturbations. Periodic forcing …
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