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Keywords: peak strength
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Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1130
..., then the uniaxial compressive tests were mimicked in this study. The results indicate that the peak strength of models decreases generally with the increase of fracture number, which is due to the growth of microcracks generated in fractures. The percentage of cracks formed in fractures increases regarding...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1103
... of their ability to reproduce the geomechanical attributes (unconfined and confined) of a granitic rock. It was found that the elastic BBM with no provision for grain damage overpredicted the peak strengths for high confinement conditions. The introduction of inelasticity or explicit fractures within the blocks...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1120
... parting strength reduction method peak strength rock-18 cms rock parting ARMA 21 1120 Stability Analysis of Coal Rib with Rock Parting based on the Strength Reduction of the Coal Mass Model Yuting Xue and Khaled M. Mohamed CDC National Institute for Occupational Safety and Health, Pittsburgh, PA...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0204
... close relation to the other time-dependent behaviors such as creep and relaxation. However, only the loading-rate dependence of peak strength has been investigated in the previous studies. In this paper, the theoretical background and the previous experimental studies of the loading-rate dependence...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0450
... specimen showed plasticization under a higher confining stress condition; anthracite coal has a strong adsorption effect on CO 2 and the free gas phase CO 2 adsorption can cause a dramatic peak strength deterioration; coal strength deterioration was exacerbated with respect to gas pressure. However...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-1954
...-based methods were used to calculate elastic properties, peak strength, crack initiation, and crack damage. The vein-type samples were on average softer, weaker, and had lower brittle thresholds than their matrix counterparts. Variability within the vein-type samples is attributed to vein mineralogy...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-1675
... of peak strength and elastic properties (Young's modulus and Poisson's ratio), as measured through unconfined or confined (triaxial) testing. However, with the advent of stiff, servo-controlled loading frames able to collect accurate post-peak data during triaxial tests, it is also possible to estimate...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-876
... orientation input parameter peak strength MPa Upstream Oil & Gas Simulation Lisjak georgian bay shale compression test perpendicular tunnel bedding plane Brazilian disc element size 1. INTRODUCTION Numerical modelling is an invaluable tool used to understand varying scales of complex rock...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-251
... are presented and linked to the macro-scale responses. The simulation results show that the strength and modulus of jointed rock masses decrease significantly due to excavation. The peak strength after excavation returns to the largest axial stress value before excavation regardless of the joint inclination...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-713
... and has some applicability. wellbore integrity hard rock pressure sensitivity Reservoir Characterization Upstream Oil & Gas peak strength reservoir geomechanics strength failure criterion strength parameter Wellbore Design criterion marble residual strength cohesion MPa internal...
Proceedings Papers

Paper presented at the 50th U.S. Rock Mechanics/Geomechanics Symposium, June 26–29, 2016
Paper Number: ARMA-2016-508
... was observed to occur at stress differences similar to the peak strength of the shale as determined by constant strain rate triaxial tests in some samples, other samples ruptured at stress differences of only 25 to 50 percent of the expected peak strength. Introduction Fine-grained geological units...
Proceedings Papers

Paper presented at the 50th U.S. Rock Mechanics/Geomechanics Symposium, June 26–29, 2016
Paper Number: ARMA-2016-725
... Abstract: Although it is recognized that the peak strength of the rock is a unique function of confining stress minus pore pressure (s 3 – P ), examples of laboratory or numerical studies that focused on investigating the effects of pore pressure on weakening or strengthening the crack...
Proceedings Papers

Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-363
... and deformation of a coal-mass. The peak strength is evaluated by the Hoek-Brown failure criterion. The residual stiffness and strength are evaluated by the Fang and Harrison degradation model. The dilation is defined by the Alejano and Alonso peak-dilation model. Using laboratory and in-situ coal numerical...
Proceedings Papers

Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-430
.... The calibrated model very accurately predicts, in a quantitative sense, the macroscopic properties of real granite such as elastic properties, damage thresholds (crack initiation and interaction stresses), peak strengths (tensile and compression strengths), triaxial strength envelope (friction angle and cohesion...
Proceedings Papers

Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-510
...-peak behavior of rocks depends on the specimen slenderness, implying that the slenderness effect can be an intrinsic geometry effect of Mohr-Coulomb material such as rocks. Next, it is shown that the end constraint enhances the post-peak strength of rocks by inducing confined zones in the specimen...
Proceedings Papers

Paper presented at the 48th U.S. Rock Mechanics/Geomechanics Symposium, June 1–4, 2014
Paper Number: ARMA-2014-7634
... Characterization criterion residual strength peak strength Barton criteria porosity Upstream Oil & Gas compressive strength estimation residual value shear strength roughness normal stress envelope fragment friction angle strength constant friction angle particle Rockfill rock mass 1...
Proceedings Papers

Paper presented at the 48th U.S. Rock Mechanics/Geomechanics Symposium, June 1–4, 2014
Paper Number: ARMA-2014-7021
.... The numerical experiment results show that when modeling the rock behavior under compression, ignoring the coupled damage-flow processes results in an inaccurate prediction of mechanical properties of rock such as the peak strength and the post-peak response. The stress-strain response of the sample indicates...
Proceedings Papers

Paper presented at the 47th U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2013
Paper Number: ARMA-2013-194
... micro-scale behaviors and macro-scale responses. The observed characteristics of stress distribution and cracking behaviors are discussed. Reservoir Characterization Engineering elastic response peak strength grain size distribution crack initiation threshold heterogeneity reservoir...
Proceedings Papers

Paper presented at the 47th U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2013
Paper Number: ARMA-2013-240
... provided confinement to the rock specimens during testing. A constant deformation rate of 0.003 mm/s was used in all tests. This rate achieved peak strengths within 5 to 10 minutes of loading. Differences in elastic properties between rock and the steel loading platens used in testing were expected...
Proceedings Papers

Paper presented at the 47th U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2013
Paper Number: ARMA-2013-454
... with those from the cohesive crack model if model parameters were properly calibrated. reservoir geomechanics hydraulic fracturing stress displacement curve Upstream Oil & Gas damage mechanics peak strength bulk material Reservoir Characterization cohesive crack model calibration...

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