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Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0098
... directions were systematically varied during the test. The results show that differential stress of 20 MPa compressed to coal resulted in an order of magnitude drop in permeability. For the pre-existing natural fractures in coal, the butt cleat plane was more sensitive to variations in the principal stress...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-1710
... weak plane being formed with numerous thermal cracks inside the coal samples during the thermal fatigue loading. When the confining stress level is low, the major fracture is followed by the thermal shock. On the contrary, if a coal sample is subjected to higher stress level, the directions of the...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-1711
... Characterization Upstream Oil & Gas in-situ ae AE event borehole plane in-situ acoustic emission frequency range sensor kHz nakatani cementation experiment naoi plenker excavation AE sensor 1. INTRODUCTION For the safe use of underground structures like mines monitoring of their conditions...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-1792
... virtually map large numbers of discontinuity features such as fractures, bedding planes, and joints; features that would otherwise be inaccessible in a safe manner. Volumetric measurements can be made on discrete hazardous blocks to support rock fall simulation studies. This workflow was applied at a...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-2027
...-automated approach machine learning persistence parameterization Island plane assessment rockfall hazard assessment photogrammetry point cloud investigation wall strength discontinuity acquisition 1. INTRODUCTION Rockfalls present a substantial increase in their spatial and temporal...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-2062
... as for calculation of the safe drilling window. Two case study wells for the Permian Basin (West Texas and New Mexico) are included in our study. Upstream Oil & Gas shear failure Reservoir Characterization failure location plane Wellbore Design elastic anisotropy stress...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-2043
... specimens showed pronounced increase in the significance of the time-dependent behavior after the formation of a major failure plane within the specimen. Due to the irregular surface of the failure plane, the time-dependent behavior of failed specimens became much more complex than intact ones. In order to...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-2162
... material point calibration microstructural direction plane material parameter elastoplastic parameter anisotropy 1. INTRODUTION We introduce an anisotropic modified Cam-clay model that captures rate-dependent responses of clay, mudstone, shales and sedimentary rock. By extending the strain space...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-2147
... faults. The paper will also show that this behaviour is inherent in the incremental stress/strain formulation of constitutive models and not specific to any finite element or finite difference code. Reservoir Characterization joint model bedding Upstream Oil & Gas plane application...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-2182
... the additional stress induced by the dilated rock matrix. hydraulic fracturing fracture interaction natural fracture Upstream Oil & Gas paluszny complex reservoir fracture tip flow in porous media Fluid Dynamics Simulation plane quantify interaction magnitude matrix...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-2178
... elasticity, or the Lekhnitskii-Amadei anisotropic elasticity solution. Shear failure along the borehole wall can be modeled using two variants of the Jaeger plane of weakness model, using either the Mohr-Coulomb or the Mogi-Coulomb failure criterion for failure along planes other than a bedding plane. In...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0483
... geomechanics orientation hydraulic fracturing displacement US government strength Reservoir Characterization Upstream Oil & Gas roughness mineral orientation fracture toughness mineral texture gypsum gypsum sample plane fracture propagation texture cast gypsum laboratory west lafayette...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-1619
... ABSTRACT: We investigate the case of a hydraulic fracture (HF) propagating perpendicular to the isotropy plane of a transversely isotropic material: a relevant configuration for the growth of HFs in sedimentary rocks where fractures are propagating vertically across layers. We extend the...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-772
... source model plane mt solution decomposition confidence zone 1. INTRODUCTION Acoustic emission (AE) is a phenomenon that spans the generation and propagation of acoustic (elastic) waves caused by sudden irreversible changes in the internal structure of a type of material. In the case of rock, it...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-1357
... geometry. The failure mode of the joint specimen under compression-shear loading can be classified into four types: coplanar shear failure, shear failure along the joint plane, shear failure along the shear stress plane and similar integrity shear failure. The joint dip angle has a decisive effect on the...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-151
... monomineralic metamorphic rock comprised of the mineral pyrophyllite, and hence an analogy for natural shale. A 6” long horizontal cylindrical pyrophyllite sample (wellbore parallel to bedding plane) is hydraulically fractured using water under uniaxial conditions with an effective maximum stress of 830 psi...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-1434
... ABSTRACT: This study investigated the effect of internal discontinuity on the dynamic response of a dip slope and evaluated the performance of Newmark's theory on the sliding of a dip slope with multi-slip planes. A series of shaking table tests were performed under various geometric...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-176
.... Reservoir Characterization orientation mechanism Geophy shear band shear plane Upstream Oil & Gas acoustic emission Montney shale fracture growth AE event Vavry�uk diagram stanchit lockner granite deformation inversion source mechanism 1. INTRODUCTION The process of rock...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-262
... elastic anisotropy characterized by the direction of the plane of isotropy parallel to the laminar structure of the shale formation. In the fault zone, strong rotations of the direction of anisotropy can be observed. Upstream Oil & Gas GPa discontinuity elastic property reservoir...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-479
.... After the experiment, the samples were split open along the failure plane and the height profiles of the fractures were collected using a white-light profilometer. Power spectral density (PSD) obtained from Fourier transforms of the roughness profiles were analyzed to obtain Hurst exponents reflecting...

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