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您的检索式：作者名="Martin OSaar"
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| 1 | A methodology to determine the elastic properties of anisotropic rocks from a single uniaxial compression test显示文摘This paper introduces a new methodology to measure the elastic constants of transversely isotropic rocks from a single uniaxial compression test.We first give the mathematical proof that a uniaxial compression test provides only four independent strain equations.As a result,the exact determination of all five independent elastic constants from only one test is not possible.An approximate determination of the Young’s moduli and the Poisson’s ratios is however practical and efficient when adding the Saint-Venant relation as the fifth equation.Explicit formulae are then developed to calculate both secant and tangent definitions of the five elastic constants from a minimum of four strain measurements.The results of this new methodology applied on three granitic samples demonstrate a significant stress-induced nonlinear behavior,where the tangent moduli increase by a factor of three to four when the rock is loaded up to 20 MPa.The static elastic constants obtained from the uniaxial compression test are also found to be significantly smaller than the dynamic ones obtained from the ultrasonic measurements. | Morteza Nejati Marie Luise Texas Dambly Martin OSaar | 2019 | Journal of Rock Mechanics and Geotechnical Engineering2019，11，6： | 3 |
| 2 | A numerical investigation into key factors controlling hard rock excavation via electropulse stimulation显示文摘Electropulse stimulation provides an energy-efficient means of excavating hard rocks through repeated application of high voltage pulses to the rock surface.As such,it has the potential to confer significant advantages to mining and drilling operations for mineral and energy resources.Nevertheless,before these benefits can be realized,a better understanding of these processes is required to improve their deployment in the field.In this paper,we employ a recently developed model of the grain-scale processes involved in electropulse stimulation to examine excavation of hard rock under realistic operating conditions.To that end,we investigate the maximum applied voltage within ranges of 120e600 kV,to observe the onset of rock fragmentation.We further study the effect of grain size on rock breakage,by comparing fine(granodiorite)and coarse grained(granite)rocks.Lastly,the pore fluid salinity is investigated,since the electric conductivity of the pore fluid is shown to be a governing factor for the electrical conductivity of the modeled system.This study demonstrates that all investigated factors are crucial to the efficiency of rock fragmentation by electropulsing. | Daniel Vogler Stuart DCWalsh Martin OSaar | 2020 | Journal of Rock Mechanics and Geotechnical Engineering2020，12，4： | 3 |
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