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Keywords: shear crack
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Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0388
... state bottom flaw different uniaxial compression load Reservoir Characterization roughness specimen coalescence stress tensile crack fluid modeling frictionless interface oblique shear crack Coalescence geometry crack initiation Upstream Oil & Gas frictional interface shear crack...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-292
... microcracking behavior and macroscopic fracturing mode. complex reservoir Simulation shear crack BPM strength GBM boundary hydraulic fracturing heterogeneity fracture network Upstream Oil & Gas parallel bond Carrara marble geometry fabric numerical model crystalline rock grain...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0411
... ABSTRACT: In the laboratory, uniaxial compression experiments were performed on prismatic specimens of Indiana limestone with two pre-existing parallel flaws. Full waveform measurements of shear waves were used to monitor shear crack initiation and propagation in rock. Simultaneously, digital...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0504
..., while shear cracks can cross it. This mechanism seems to favor crack coalescence through shear cracks when the flaws are separated by a smooth interface, rather than through tensile cracks, which is what happens when there is a rough interface. 1. INTRODUCTION hydraulic fracturing propagate...
Proceedings Papers

Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-245
... propagation of these cracks require application of additional load). These cracks are also characterized by a plumose structure on their surface. Shear cracks initiate from the tips of the flaws, they are initially stable, but they may be unstable close to crack coalescence or specimen failure. These cracks...
Proceedings Papers

Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-675
... found to be the first cracks to initiate from the flaw boundary and continued loading leads to initiation of a secondary group of cracks that may be a combination of tensile and shear cracks. However, the types and mechanisms of the new cracks that developed after the tensile wing cracks are often hard...
Proceedings Papers

Paper presented at the 48th U.S. Rock Mechanics/Geomechanics Symposium, June 1–4, 2014
Paper Number: ARMA-2014-7208
... crack reservoir geomechanics Simulation shear crack failure process hydraulic fracturing mechanism shear stress fracture compression test orientation distribution numerical model brittle rock micro crack granite uniaxial compression test 1. INTRODUCTION Brittle rock is one of the main...
Proceedings Papers

Paper presented at the 48th U.S. Rock Mechanics/Geomechanics Symposium, June 1–4, 2014
Paper Number: ARMA-2014-7727
... rocks. As the bedding angle increased, fractures initiating at the flaw tips tended to propagate more frequently along the bedding planes. Coalescence of cracks between flaws trended from direct-combined (tensile and shear cracks) to indirect as the bedding plane angle increased. Tensile crack...
Proceedings Papers

Paper presented at the 46th U.S. Rock Mechanics/Geomechanics Symposium, June 24–27, 2012
Paper Number: ARMA-2012-339
... on the crack growth from a closed flaw (crack) under compression are investigated. The NMM can not only accurately predict the pure tensile or pure shear crack growth, but also satisfactorily predict the development of mixed shear-tensile crack types. The crack type is strongly influenced by the...
Proceedings Papers

Paper presented at the 46th U.S. Rock Mechanics/Geomechanics Symposium, June 24–27, 2012
Paper Number: ARMA-2012-593
... propagation were modeled based upon laboratory results. For the stepped flaws, both stress and strain field analyses correctly explain wing and shear crack initiation and propagation in gypsum and marble. Furthermore, the two analyses are also capable of describing reasonably well tensile and shear...
Proceedings Papers

Paper presented at the 45th U.S. Rock Mechanics / Geomechanics Symposium, June 26–29, 2011
Paper Number: ARMA-11-449
... hydraulic fracturing Reservoir Characterization Upstream Oil & Gas shear coalescence orientation inclusion interface Wellbore Design coalescence pattern specimen flaw pair inclusion pair Coalescence inclusion material test repetition shear crack brittle material interface direct...
Proceedings Papers

Paper presented at the 44th U.S. Rock Mechanics Symposium and 5th U.S.-Canada Rock Mechanics Symposium, June 27–30, 2010
Paper Number: ARMA-10-369
...-flawed specimens in this study. The flaw geometry in the double-flawed specimen was a combination of a horizontal flaw and an underneath inclined flaw. Tensile and shear cracks were observed at the tip of the flaws for each material and the different cracking process depending on the material types were...
Proceedings Papers

Paper presented at the 43rd U.S. Rock Mechanics Symposium & 4th U.S. - Canada Rock Mechanics Symposium, June 28–July 1, 2009
Paper Number: ARMA-09-037
... fracture Fluid Dynamics viscous fluid particle shear crack high viscous fluid fluid viscosity rock model ARMA 09-37 THE DISTINCT ELEMENT ANALYSIS FOR HYDRAULIC FRACTURING CONSIDERING THE FLUID VISCOSITY Shimizu, H., Murata, S. and Ishida, T. Kyoto University, Kyoto, Japan ABSTRACT: The flow...
Proceedings Papers

Paper presented at the Golden Rocks 2006, The 41st U.S. Symposium on Rock Mechanics (USRMS), June 17–21, 2006
Paper Number: ARMA-06-937
... conducted. The lab tests and finite element modeling reveal that a valid shear crack is produced. Tests conducted at different confining stresses show that the shear cracking strength is a function of confining stress. Tests at each confinement were repeated 7 times, and even though the scatter in the...
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-01-0731
... cracks are shear cracks that also initiate from the tips of the flaws and propagate in a stable manner. Numerical simulations with the code FROCK, a Hybridized Indirect Boundary Element Method, show that: (1) the initiation of a kink does not eliminate the stressingularity at the tip of the flaw; (2) the...
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-99-0153
... extensile and shear crack growth. The basis for the hydraulic part of the model is the flow through rectangular tubes. The model takes into account three coupled processes: the decrease in permeability due to the squeezing of initially open cracks, the increase in permeability due to the growth of extensile...
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-99-0217
... process, i.e. a shear and a tensile crack, are investigated using a bifurcation theory and a tensile strength model, respectively. Also considered here is the combined cracking mode in which an initial shear crack is subsequently changed into the tensile crack mode by external stresses. However, a...
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
.... However, the results showed that the orientation of the principal strain directions shifted from the hydrostatic region to the triaxial region. Two different mechanisms relating to closing of microcracks and shear crack sliding might explain this observation. Another shift in the orientation of the...
Proceedings Papers

Paper presented at the The 33rd U.S. Symposium on Rock Mechanics (USRMS), June 3–5, 1992
Paper Number: ARMA-92-0797
... of the main applied compression load. The role of sources of the secondary cracks is played by internal pre- existing defects. Two extreme types of the defects are usually considered for modelling of the secondary crack growth: (i) pre-existing shear cracks, inclined with respect to the axis of...

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