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A methodology to determine the elastic properties of anisotropic rocks from a single uniaxial compression test

Journal of Rock Mechanics and Geotechnical Engineering 2019年第6期11卷 1166-1183页

作者： Morteza Nejati Marie Luise Texas Dambly martin osaar Department of Earth Sciences ETH ZurichZurichSwitzerland Geothermal Energy and Geofluids Department of Earth SciencesETH ZurichZurichSwitzerland

This paper introduces a new methodology to measure the elastic constants of transversely isotropic rocks from a single uniaxial compression *** first give the mathematical proof that a uniaxial compression test provides only four independent strain *** a result,the exact determination of all five independent elastic constants from only one test is not *** 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 *** formulae are then developed to calculate both secant and tangent definitions of the five elastic constants from a minimum of four strain *** 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 *** 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.

关键词： Transversely isotropic rock Elastic constants Young’s modulus Poisson’s ratio Seismic anisotropy Uniaxial compression Granite

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A numerical investigation into key factors controlling hard rock excavation via electropulse stimulation

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Journal of Rock Mechanics and Geotechnical Engineering 2020年第4期12卷 793-801页

作者： Daniel Vogler Stuart DCWalsh martin osaar Geothermal Energy and Geofluids Institute of GeophysicsETH ZurichZurichSwitzerland Department of Civil Engineering Monash UniversityMelbourneAustralia Department of Earth and Environmental Sciences University of MinnesotaMinneapolisUSA

Electropulse stimulation provides an energy-efficient means of excavating hard rocks through repeated application of high voltage pulses to the rock *** such,it has the potential to confer significant advantages to mining and drilling operations for mineral and energy ***,before these benefits can be realized,a better understanding of these processes is required to improve their deployment in the *** 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 *** that end,we investigate the maximum applied voltage within ranges of 120e600 kV,to observe the onset of rock *** further study the effect of grain size on rock breakage,by comparing fine(granodiorite)and coarse grained(granite)***,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 *** study demonstrates that all investigated factors are crucial to the efficiency of rock fragmentation by electropulsing.

关键词： Electropulse stimulation High voltage breakdown Numerical modeling Drilling Thermo-mechanics

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