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Keywords: wing crack
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Proceedings Papers

Paper presented at the 57th U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2023
Paper Number: ARMA-2023-0364
... geomechanics jointed rock uniaxial compression geology specimen compression mechanism eng fracture behavior fissured rock wing crack coalescence compressive load failure mode geologist wellbore design reservoir characterization characteristic rock mech uniaxial loading static compressive...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1131
...-Discrete Element Method). In this study, the biaxial loading is performed to study the fracture coalescence via FDEM for the first time, and the result of the crack patterns and sequence are close to laboratory observations. As the vertical load increasing, whole process including wing crack initiation...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-629
... significant flow rate increase can be achieved through the fracture network generation in the process of fracture propagation and coalescence. In addition, both tensile wing cracks, shear and/or mixed-mode propagated secondary cracks can form during shear stimulation. These observations show that the so...
Proceedings Papers

Paper presented at the 50th U.S. Rock Mechanics/Geomechanics Symposium, June 26–29, 2016
Paper Number: ARMA-2016-851
... Abstract: Shear slip on the natural fractures is proposed as a viable stimulation mechanism in unconventional geothermal and petroleum reservoirs. Fracture mechanics studies show that the propagation of mechanically closed fractures often involves both mode I and II propagation. Wing cracks...
Proceedings Papers

Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-337
... to describe the path of wing crack propagation which is more closed to reality. third, representative elemental volumes are adopted to tackle the damage localization. The new model is applied to investigate the influence of microcrack parameters on the depth and area of splitting failure zone. This study can...
Proceedings Papers

Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-487
... compression strength simulation displacement reservoir geomechanics reference point wing crack flaw coalescence specimen crack initiation propagation rock mech einstein upstream oil & gas frock uniaxial compression hydraulic fracturing initiation fracture numerical simulation 1...
Proceedings Papers

Paper presented at the 48th U.S. Rock Mechanics/Geomechanics Symposium, June 1–4, 2014
Paper Number: ARMA-2014-7068
... initiation specimen hydraulic fracturing wing crack einstein hh Reservoir Characterization element method DEM Coalescence loading fracture flaw compression open flaw tensile crack rock mass crack initiation application uniaxial compression propagation 1. INTRODUCTION It is well known...
Proceedings Papers

Paper presented at the 46th U.S. Rock Mechanics/Geomechanics Symposium, June 24–27, 2012
Paper Number: ARMA-2012-593
... coalescence in gypsum and marble, respectively. For the coplanar flaws, it was found that the stress field analysis is capable of explaining wing crack initiation and propagation observed in tests on gypsum and marble. It is also capable of explaining shear coalescence observed in gypsum...
Proceedings Papers

Paper presented at the 46th U.S. Rock Mechanics/Geomechanics Symposium, June 24–27, 2012
Paper Number: ARMA-2012-615
...) in granite material petal cracks initiated first inside the specimen, and in PMMA material wing cracks emanated first on the specimen surface; (v) petal cracks inside the granite specimens propagated from the anti-wing crack side towards the wing crack side, whereas petal cracks in the PMMA specimens...
Proceedings Papers

Paper presented at the 46th U.S. Rock Mechanics/Geomechanics Symposium, June 24–27, 2012
Paper Number: ARMA-2012-628
... in the vicinity of the crack tip is altered significantly. Reservoir Characterization inclination angle wing crack hydraulic fracturing CCNBD specimen crack inclination angle chevron notch crack reservoir geomechanics Upstream Oil & Gas crack plane failure load notch crack cyclic loading...
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-10-512
... crack Wellbore Design wing crack unbolted case dip angle Reservoir Characterization intermittent jointed rock mass failure mode Reinforcement Effect mechanics Rocklike Material scale experiment study 1. INTRODUCTION Intermittent joint cuts the rock material into intermittent jointed rock...
Proceedings Papers

Paper presented at the The 42nd U.S. Rock Mechanics Symposium (USRMS), June 29–July 2, 2008
Paper Number: ARMA-08-134
... has been done on fracturing processes on rocks and rock-model materials in compression. Although there are some differences in the crack patterns observed in compression depending on the materials used, two types of cracks are commonly found from a pre-existing fracture: wing cracks and secondary...
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-06-930
... ABSTRACT: A total of 170 tests (68 tests for monotonic loading, 102 tests for cyclic loading) have been performed to investigate crack initiation, propagation and coalescence. The specimens have two pre-existing flaws which are arranged at different distances and angles. Wing cracks...
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
... ABSTRACT: Two types of cracks are observed in brittle materials in compression: wing cracks and secondary cracks. Wing cracks are tensile cracks that initiate at the tips of pre-existing cracks (flaws) and propagate in a stable manner towards the direction of maximum compression. Secondary...
Proceedings Papers

Paper presented at the The 35th U.S. Symposium on Rock Mechanics (USRMS), June 5–7, 1995
Paper Number: ARMA-95-0477
... marble, without actually counting the microcracks through microscope. strength grain marble wave speed measurement Reservoir Characterization microcrack crack length prediction peak strength Upstream Oil & Gas crack density reservoir geomechanics wing crack grain size initial...
Proceedings Papers

Paper presented at the The 35th U.S. Symposium on Rock Mechanics (USRMS), June 5–7, 1995
Paper Number: ARMA-95-0789
... of the beams. tensile failure crack length deflection loading reservoir geomechanics Thickness pressure solution long-term loading Reservoir Characterization Upstream Oil & Gas wing crack initial crack length compressive strength tensile strength compressive failure deformation...
Proceedings Papers

Paper presented at the The 35th U.S. Symposium on Rock Mechanics (USRMS), June 5–7, 1995
Paper Number: ARMA-95-0731
... cracks sufficiently grown due to the stress concentration at the fault front. This mechanism makes the fault "thick" and, hence, restricts the stress concentration. It is shown that while this stress concentration is sufficient for connecting wing cracks, it is not enough to produce tensile out-of-plane...

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