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Keywords: grain size
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Proceedings Papers

Paper presented at the 57th U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2023
Paper Number: ARMA-2023-0097
... of the artificial conglomerate sample are 300 mm × 300 mm × 300 mm. The ratio of cement and quartz sand is 1:1. The gravel grain size is about 1 cm for small grains, 3 cm for medium grains, and 6 cm or more for large grains. The gravels are arranged in three ways: regular arrangement of small grains, regular...
Proceedings Papers

Paper presented at the 57th U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2023
Paper Number: ARMA-2023-0352
... subdiscipline niemeijer grain size reservoir geomechanics solid earth spier friction friction experiment fault gouge normal stress frictional behavior creep experiment microphysical model friction rate parameter mechanism friction coefficient ARMA 23-0352 Microphysical Modelling of Frictional...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-1799
... recession and utilizes a fracture mechanics criterion to predict the onset of spallation at critical flaws within a thermoelastic stress field. A fundamental assumption of the model is that critical flaw sites are located at the grain boundaries. This introduces the grain size naturally into the formulation...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-1199
..., over 60% decrease in grain size due to extensive grain damage and changes in coordination number and contact radius. We used image-derived porosity, grain radius, contact number and contact radius to compute P-wave velocities with the Hertz-Mindlin model. Our observations showed that numerous...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-454
... and the evolution of its internal gradations. knowledge management settlement analysis specimen Upstream Oil & Gas grain size hydraulic fracturing particle Rockfill rockfill material secondary rockfill rockfill dam Alonso shuibuya cfrd deformation Zhou construction cross section breakage...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-098
... reaction force magnitude decreasing; random grain placing and/or grain random dimensions caused increasing of rock reaction force scattering; random grain sizes are more essential for rock reaction forces (and their projections) scattering than random grain distribution. Upstream Oil & Gas...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0223
... and Operations strength grain size Potyondy buckling-assisted fragmentation hydraulic fracturing TWC test CG material damage process fragment Microstructure resolution fracture flat-jointed material fragmentation confinement Castlegate sandstone specimen shear fracture 1. INTRODUCTION...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0569
... ABSTRACT: This paper focuses on the simulation of localized compaction in granular rocks. For this purpose, a continuum framework referred to as Breakage Mechanics is used to capture the role of microscopic crushing on the mechanical response of grain assemblies. In particular, grain size...
Proceedings Papers

Paper presented at the 50th U.S. Rock Mechanics/Geomechanics Symposium, June 26–29, 2016
Paper Number: ARMA-2016-409
.... Another source of uncertainty is the poor characterization of the rocksalt body's physical properties spatial distribution. Here we touch upon rocksalt grain-size and chemical composition as two such major uncertainties and discuss the effects this can have on the overall subsidence response. We finish...
Proceedings Papers

Paper presented at the 50th U.S. Rock Mechanics/Geomechanics Symposium, June 26–29, 2016
Paper Number: ARMA-2016-624
... a relatively small rock sample with realistic grain size. It has been shown previously that the cutting specific energy, derived from the tangential force, estimates the specific energy. In this study, mechanical properties of a Bentheimer sandstone was determined by laboratory testing. The commercial Particle...
Proceedings Papers

Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-231
... properties such as permeability and water retention curve (WRC). This paper addresses the continuum modeling of grain crushing in unsaturated sands within the framework of the Breakage Mechanics theory. This choice enables us to discuss the role of an evolving grain size distribution (GSD) on both mechanical...
Proceedings Papers

Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-375
... subsidence pressure decrease fluid dynamics rocksalt flow shear stress pore pressure decrease viscosity deformation upstream oil & gas surface subsidence rocksalt reservoir characterization simulation reservoir geomechanics grain size maxwell time subsidence geometry 1. INTRODUCTION...
Proceedings Papers

Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-331
... evaluation and development of CO 2 storage potential in the North Sea. tensile strength shale upper jurassic draupne formation bedding plug rubble zone anisotropy reservoir characterization skurtveit grain size lineation reservoir geomechanics fracture core section 1 north sea...
Proceedings Papers

Paper presented at the 48th U.S. Rock Mechanics/Geomechanics Symposium, June 1–4, 2014
Paper Number: ARMA-2014-7473
... at grain boundaries are also observed in the bulk of the material, as indirect signs of GBS. Reservoir Characterization Imaging incompatibility halite contribution plasticity grain size procedure bornert deformation investigation Upstream Oil & Gas full-field measurement mechanism...
Proceedings Papers

Paper presented at the 48th U.S. Rock Mechanics/Geomechanics Symposium, June 1–4, 2014
Paper Number: ARMA-2014-7614
... the prediction of the onset of deformation band formation. The predictions of the model are compared to an extensive set of experimental compressibility measurements. Parameters describing the effects on uniaxial compressibility for sorting, angularity, and grain size are reported for pure quartz sands. Models...
Proceedings Papers

Paper presented at the 47th U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2013
Paper Number: ARMA-2013-348
... in powder engineering. rail transportation cumulative gsd grain size grain size distribution Upstream Oil & Gas normalized grain size assembly ground transportation granular assembly thermodynamic framework sequence case 3 granular material evolution ballast modeling particle...
Proceedings Papers

Paper presented at the 47th U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2013
Paper Number: ARMA-2013-168
... investigates the role of grain size on the process zone and size effect parameters by conducting a discrete element simulation of rock fracture. A softening contact bond model is used to study the development of the process zone around a notch tip in three-point bending tests. The numerical simulation...
Proceedings Papers

Paper presented at the 47th U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2013
Paper Number: ARMA-2013-175
... discontinuous flaw Reservoir Characterization fracture intensity fracture characterization grain size strength mean grain size flaw through-going flaw Upstream Oil & Gas heterogeneity rock mass strength grain-based model grain size distribution mineral grain 1. INTRODUCTION A rock mass...

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