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Keywords: shear band
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Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-2147
... ubiquitous joint model ubiquitous joint constitutive model reservoir geomechanics weak plane discrete joint network rock mass Crown displacement field shear band discontinuity joint orientation Invert 1. INTRODUCTION Ubiquitous joint constitutive models have been available for numerical...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-1760
... ABSTRACT: Advance and improve experimental techniques to study fluid-assisted fracturing in weakly consolidated sediments. Verify and characterize the presence of plastic yielding features such as shear banding and cavity expansion. Study scale and stress effects on hydraulic...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-176
..., source hypocenter determinations, moment tensor inversion, and stress inversion. Results show that AE events were all triggered around the peak stress and that a large stress drop occurred. Through hypocenter location analysis, a spatial correspondence of AE clusters and the shear band imaged by CT scan...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0072
... a strong dependence on Lode angle. Specimens behaved in a nearly linear elastic manner until approximately 75% of the peak stress was reached. The angle of the failure feature (shear band) was compared to predictions developed by using the Rudnicki and Rice (1975) localization criterion. It was found...
Proceedings Papers

Paper presented at the 48th U.S. Rock Mechanics/Geomechanics Symposium, June 1–4, 2014
Paper Number: ARMA-2014-7626
... the macroscopic stress from the micro-mechanical force chances. The pore geometries of the shear band and host matrix are then quantitatively evaluated through morphology analysis and flow simulations. Hydraulic properties estimated from multiscale flow simulations are compared with those inferred from volume...
Proceedings Papers

Paper presented at the 46th U.S. Rock Mechanics/Geomechanics Symposium, June 24–27, 2012
Paper Number: ARMA-2012-367
... previously reported experimental compactant features (compaction bands, compaction localization and compactant shear bands) and similar features observed under the true triaxial states of stress used here. One of the first reports of pure compaction bands was by Mollema and Antonellini [1] who documented...
Proceedings Papers

Paper presented at the 45th U.S. Rock Mechanics / Geomechanics Symposium, June 26–29, 2011
Paper Number: ARMA-11-228
... in the classical plasticity theory. The shear band features also resemble the shear fracture observed in the injection experiments in sands reported in the literature. computational cost, each coupling data exchange occurs only after certain cycles of mechanical calculation. Meanwhile, to properly resolve...
Proceedings Papers

Paper presented at the The 42nd U.S. Rock Mechanics Symposium (USRMS), June 29–July 2, 2008
Paper Number: ARMA-08-300
... ABSTRACT: Plane strain compression tests were performed on Berea sandstone to investigate the mechanisms involved in the development and propagation of a shear band. Thin sections for optical microscopy and digital photographs were prepared by injecting blue-colored epoxy into failed...
Proceedings Papers

Paper presented at the The 42nd U.S. Rock Mechanics Symposium (USRMS), June 29–July 2, 2008
Paper Number: ARMA-08-292
... ABSTRACT: Discrete particle modeling has been performed to simulate failure of bonded rock (in 2D) at various confining pressures. While shear bands develop at low confinement, localization at high stress levels occur through formation of low-angle compaction band like features. Significant...
Proceedings Papers

Paper presented at the The 42nd U.S. Rock Mechanics Symposium (USRMS), June 29–July 2, 2008
Paper Number: ARMA-08-236
... to thin shear bands. The softening is mainly an effect of increased porosity during deformation. An initial transient strain hardening is seen in all experiments and seems caused by reorganization of the sand grains into a stress-supporting framework with grain contacts orientated subperpendicular to s 1...
Proceedings Papers

Paper presented at the DC Rocks 2001, The 38th U.S. Symposium on Rock Mechanics (USRMS), July 7–10, 2001
Paper Number: ARMA-01-0045
... 'dog-ear' breakouts (Van den Hoek et al. 1992, 1994a,b, 1996, 2000a; Haimson et aL 1993). In the latter case (shear failure), it is also possible that breakouts do not develop at all, but instead the cavity remains circular in shape, while shear bands are spiralling outwards from the cavity wall...
Proceedings Papers

Paper presented at the DC Rocks 2001, The 38th U.S. Symposium on Rock Mechanics (USRMS), July 7–10, 2001
Paper Number: ARMA-01-1553
... to as the PFC Model for Rock. Reservoir Characterization Upstream Oil & Gas Modeling & Simulation hydraulic fracturing reservoir geomechanics tensile fracture shear band strength PFC model anisotropic material st material microcrack fracture MPa prediction notch representation...
Proceedings Papers

Paper presented at the Vail Rocks 1999, The 37th U.S. Symposium on Rock Mechanics (USRMS), June 7–9, 1999
Paper Number: ARMA-99-1133
... INTRODUCTION ABSTRACT: Radial strain recordings from 24 triaxial tests on sandstone cores had been analysed in order to investigate if dilation could be related to localisation of shear bands. A weak azimuthal anisotropy was observed both in the hydrostatic and in the triaxial stress region...
Proceedings Papers

Paper presented at the The 35th U.S. Symposium on Rock Mechanics (USRMS), June 5–7, 1995
Paper Number: ARMA-95-0447
... function, structure function (dynamic Green's function), and recording system function. Upstream Oil & Gas fault slip slip displacement specimen shear band energy release rate tensor global measurement analytic solution Reservoir Characterization release rate acoustic emission...
Proceedings Papers

Paper presented at the The 33rd U.S. Symposium on Rock Mechanics (USRMS), June 3–5, 1992
Paper Number: ARMA-92-0681
... a theoretical understanding of why such fractal geometries are commonplace in nature rather than strictly periodic geometries which develop at only one scale. The case of the spontaneous formation of a single or of conjugate shear bands in an initially homogeneous configuration is best explored and probably...
Proceedings Papers

Paper presented at the The 33rd U.S. Symposium on Rock Mechanics (USRMS), June 3–5, 1992
Paper Number: ARMA-92-0609
... angle is smaller than the interparticle friction angle; this low friction angle results from the concentration of particle rotations within shear bands. In the presence of large reaction couples at particle contacts, the overall friction angle becomes much larger than the interparticle friction angle...
Proceedings Papers

Paper presented at the The 32nd U.S. Symposium on Rock Mechanics (USRMS), July 10–12, 1991
Paper Number: ARMA-91-667
... of a shear band. By placing the upper platen on a linear bearing, the specimen has the freedom to form a failure mechanism consisting of two elastic bodies separated by a localized zone of deformation. Thus, the apparatus has the advantages of both direct shear and conventional compression testing. 1...
Proceedings Papers

Paper presented at the The 32nd U.S. Symposium on Rock Mechanics (USRMS), July 10–12, 1991
Paper Number: ARMA-91-683
... stresses as the rock attempts to revert to its original unstrained state, and not as a result of the loading. hydraulic fracturing displacement Reservoir Characterization enhanced recovery shear band compaction region shear fault fault line boundary fracture compacted material Fluid...
Proceedings Papers

Paper presented at the The 32nd U.S. Symposium on Rock Mechanics (USRMS), July 10–12, 1991
Paper Number: ARMA-91-539
... shear band cutter bit selection specific energy Upstream Oil & Gas pore pressure reservoir geomechanics mechanism shear plane aime petroleum transaction van leussen virgin pore pressure po regime speed regime expression velocity discontinuity line line source solid phase drilling...
Proceedings Papers

Paper presented at the The 29th U.S. Symposium on Rock Mechanics (USRMS), June 13–15, 1988
Paper Number: ARMA-88-0135
... ABSTRACT ABSTRACT Scanning electron microscope studies were performed on porous rocks indented by a sharp wedge. A large range of discontinuous processes was observed, such as tensile cracks and shear bands. The localization of the deformation appears both at a macroscopic level...

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