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 37 for “"Dry sand"”.
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The dynamic soil structure interaction of shallow foundations on dry sand beds
… on small-scale model structures founded on dry sand and subjected to a series of simulated earthquakes. The effect of a range of model parameters was investigated including relative density, bearing pressure, structural stiffness, aspect ratio, earthquake strength and earthquake frequency. …
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Constitutive equations for granular materials : application to dry sand and powder metal
… and Alsiny et al. (1992) on the localization in dry Ottawa sand under low pressure conditions. The physical description for the plastic flow enables the model to reproduce the macroscopic stress strain response and the complete strain localization process. The complex evolution of the strain …
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Evaluating abrasive wear resistance of extruder tooling materials using the dry sand rubber wheel abrasion test
… for extruders to determine if the ASTM G65 dry sand rubber wheel abrasion test could be used as an accelerated test to evaluate candidate materials. Samples were tested in the heat treated condition and after surface modification by plasma ion nitriding. The range of materials tested …
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Tire Performance Estimation Under Combined Slip and Empirical Parametrization of the Tire Rut on Dry Sand
… interaction between an off-road tire and a sandy terrain. This study was done to assess the performance of tires in both pure slip (only traction and braking) and combined slip conditions (steering and acceleration). A single-wheel indoor test rig was used to conduct tests under different …
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The importance of beachgoers as a source of beach litter
… all have shortcomings. This study evaluates the dry and wet sand methodology, which was devised by Barnardo and Ribbink (2020) and Ryan et al. (2020b) and has since been used by Barnardo et al. (2021) and Okuku et al. (2020) to identify beach litter originating from beachgoers, although it has …
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Prediction of the off-road rigid-ring model parameters for truck tire and soft soil interactions
… The total equivalent vertical stiffness on a dry sand is not as heavily influenced by the inflation pressure compared to predictions on a hard surface. For perspective, at 110 psi, the dry sand total vertical stiffness is nearly nine times smaller than that determined on the hard surface, …
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Seismic performance of single-propped retaining walls
… performance of single-propped retaining walls in dry sand under different seismic excitations using the finite difference software FLAC v7.0 (Itasca). The structure comprises two reinforced concrete diaphragm walls connected by a row of cross-lot struts that is used to support a 9.5m deep, 18m …
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Numerical simulations of site response and seismic settlements at Kashiwazaki-Kariwa Nuclear Power Plant, Japan
… Significant seismic settlements were observed in dry sand deposits at both the free-field site and around the power plant structure components. These total and differential settlements were reported to be the main reasons for water and oil leakage, which eventually led to flooding and fire. This …
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Ground Movements Around Model Tunnels in Sand (Settlements, Shield, Photogrammetry)
… through soft ground, was developed and tested in dry sand. The test program was divided into four series of tests. In the O-, M-, and T-series, two concentrically placed circular tubes were used representing the model shield and model liner, respectively. The model shield was pulled out of the …
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The Coefficient of Earth Pressure at Rest and Deformation and Densification of Granular Soils Subjected to Static and Dynamic Loading
… Lake Michigan Beach, Niigata, and Toyoura sand. Reconstituted dry sand specimens were subjected to 7 different loading histories, and the maximum effective vertical stress was 341 kPa. Different characteristics of dynamic vertical stresses, including periodic impulse stresses (f = 61 Hz, fp …
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Modern Invertebrate Footprints Compared with Fossil Footprints from the Coconino Sandstone (Permian)
… (Paleohelcura sp.) of the Permian Coconino sandstone of Northern Arizona, and similar footprints of other sandstone. Fine grained sand (similar to that composing the Coconino sandstone) was placed in a plexiglass tank to form slopes of various angles. The crayfish walked up and down slopes …
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Population Dynamics of Threatened Piping Plovers on the Niobrara River, Nebraska
… Plovers nest on open to sparsely vegetated river sandbars, and their demographic rates are closely linked to habitat availability and quality, as well as river flow. The Niobrara River in northern Nebraska has supported 22–41% of the state’s plovers since species listing in 1986, but the …
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Influence of grain size of a porous medium on the movement of diesel fuel due to water table fluctuations
Experiments were conducted in a sand tank to determine the influence of grain size of a porous medium and residual water saturation on the movement of diesel fuel. Three different grades of sand (#12, #20, and #30 grades with mean grain diameters of 0.178cm, 0.08cm, and 0.056cm respectively) were …
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Hurricane and human-induced habitat changes on Fire Island and Westhampton Island, New York, and the effects on breeding piping plovers (Charadrius melodus)
… rises, and anthropogenic activities. Hurricane Sandy (October 2012) modified the Atlantic coast of the United States. On Fire Island and Westhampton Island, New York, multiple overwashes and three breaches occurred. The U.S. Army Corps of Engineers filled two breaches, increased dune elevation …
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On developing a graphitic white iron for metal-to-metal wear systems
… and adhesive wear resistance was measured by dry sand/rubber wheel test and block on ring test, respectively. Empirical models were established to predict graphite volume percent for any given composition, and a Hashin-Shtrikman model was used to predict the thermal diffusivity of the …
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Pattern formation in fluid injection into dense granular media
… based on a Hele-Shaw cell filled with dense dry sand. The two dimensional nature of the setup allows direct visualization and imaging analysis of the real-time fluid and grain kinematics. The experimental results reveal that the fluid flow patterns show a transition from simple radial flow to …
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Development of FEA wide-base truck tire and soil interaction models
… Hydrodynamics (SPH), as a representative of dry sand soil. Soil models are calibrated by using shear-displacement and pressure-sinkage simulation tests. The simulation results are then compared to published data. Also, the created soil models are compared to each other to determine the …
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RESPONSES OF UNDERGROUND STRUCTURES SUBJECTED TO BLAST LOADING
… g-level. Two tests conducted at 50g, one under dry sand and the other under saturated one, using 1.2 g of TNT equivalent of explosives, resulted in explosions equivalent to 150 Kg or 1.47 KN (0.15 tons) of explosives under normal gravity (1 g). Strains induced at different location of the model …
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Impulse loading of near-field shallow-buried explosions
… the complex behaviour of shallow-buried mines in dry sand as an anti-vehicular mine threat, when considering parameters such as standoff distance and depth of burial for constant conditions of explosive aspect ratio (diameter to height values).
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Characterization and Modeling of Deformable Soils for Tire Performance Simulations
… its validation. For this study, one cohesive (sandy loam) and one non-cohesive soil (dry sand) are used. The material model parameters of both soils are identified, verified, and validated using a series of laboratory and in-situ test experimental data and numerical simulations. Later, the …
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