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Keywords: stiffness matrix
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Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-686
... stress tensor stiffness matrix equation anisotropy 1. INTRODUCTION Calculation of the distribution of stress around a borehole subjected to far field in situ stress is essential in drilling wellbore stability analysis [1,2], borehole breakout analysis [3,4], sonic log interpretation [5-7] as well...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-052
... & Gas input parameter indentation moduli stiffness matrix matrix multiscale model kerogen random variable elastic property consolidated clay fraction stiffness tensor 1. INTRODUCTION Organic-rich shales are multiphase geo-materials exhibiting multi-scale microstructure, highly...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0382
... of state strength hydraulic fracturing hydraulic fracture propagation fracture trace fracture network Reservoir Characterization Upstream Oil & Gas fracture process mechanical anisotropy fracture stiffness matrix Rutqvist reservoir geomechanics node Simulation plane injection...
Proceedings Papers

Paper presented at the 50th U.S. Rock Mechanics/Geomechanics Symposium, June 26–29, 2016
Paper Number: ARMA-2016-553
... mass cohesive discontinuity fault plane Computation shear stress enriched element displacement profile reservoir geomechanics displacement discontinuity stiffness matrix enrichment function Reservoir Characterization subdivision XFEM representation matrix displacement field 1...
Proceedings Papers

Paper presented at the 50th U.S. Rock Mechanics/Geomechanics Symposium, June 26–29, 2016
Paper Number: ARMA-2016-046
... compression test stiffness matrix perpendicular 1 1. INTRODUCTION Geomechanical anisotropy of reservoir rocks plays an important role in wellbore stability analysis (Cui and Abousleiman, 1998) as well as the design of hydraulic fracture treatments (Sesetty and Ghassemi, 2016). Laboratory characterization...
Proceedings Papers

Paper presented at the 48th U.S. Rock Mechanics/Geomechanics Symposium, June 1–4, 2014
Paper Number: ARMA-2014-7094
... in hydraulics, rock mass stability, and in coastal and offshore engineering. rock-fluid incompatibility oilfield chemistry Production Chemistry chemical treatment Upstream Oil & Gas experiment algorithm rigid block rock/fluid interaction tsunami wave stiffness matrix matrix formation...
Proceedings Papers

Paper presented at the 47th U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2013
Paper Number: ARMA-2013-416
... Abstract: We present a 3D-DDA formulation that uses an explicit time integration procedure and an efficient contact detection algorithm optimized to minimize the computational effort. The advantages of the explicit formulation are that the global stiffness matrix does not need...
Proceedings Papers

Paper presented at the 45th U.S. Rock Mechanics / Geomechanics Symposium, June 26–29, 2011
Paper Number: ARMA-11-203
... deformation analysis stiffness matrix Deformation analysis illustrative example contact constraint equation 1. INTRODUCTION The discontinuous deformation analysis (DDA), which is an energy-based method, is an alternative to the distinct element method (DEM) for discontinuity-based problems [1...
Proceedings Papers

Paper presented at the 45th U.S. Rock Mechanics / Geomechanics Symposium, June 26–29, 2011
Paper Number: ARMA-11-492
.... Artificial Intelligence maximum axial force decoupled rock bolt Reservoir Characterization Upstream Oil & Gas stiffness matrix matrix axial force boundary rock mass displacement metals & mining elasto-plastic rock mass Rock mechanics rock bolt elastic rock mass neutral point...
Proceedings Papers

Paper presented at the Alaska Rocks 2005, The 40th U.S. Symposium on Rock Mechanics (USRMS), June 25–29, 2005
Paper Number: ARMA-05-808
... geomechanics displacement Upstream Oil & Gas calibration MPa vector metals & mining block-spring model active failure area analytical solution Failure area Reservoir Characterization orientation contour stiffness matrix three-dimensional block-spring model excavation contact force...
Proceedings Papers

Paper presented at the The 35th U.S. Symposium on Rock Mechanics (USRMS), June 5–7, 1995
Paper Number: ARMA-95-0045
... of the results were compared with those of the finite element method. The method of DDA with improvement has been proven to be very effective to analyze rock stability problems in discontinuous deformable rock masses. Upstream Oil & Gas lining rock mass Wellbore Design rockbolt stiffness matrix...
Proceedings Papers

Paper presented at the The 33rd U.S. Symposium on Rock Mechanics (USRMS), June 3–5, 1992
Paper Number: ARMA-92-0775
... ABSTRACT: The fragment size distribution was calculated for caved materials; naturally caved from the caving methods of mining. The precalculation of fragment sizes was made based on the probabilistic model of rock joint systems surveyed in the field and the stiffness matrix of continuum...
Proceedings Papers

Paper presented at the The 26th U.S. Symposium on Rock Mechanics (USRMS), June 26–28, 1985
Paper Number: ARMA-85-0131-1
... and solving, for each load step, the incremental equilibrium equations [K]{au} = {at} where [K] is the stiffness matrix of the finite element assemblage, {An} and {AF} the incremental nodal displacement and force vector. Many different schemes for achieving this end exist; some do not require reformulation...
Proceedings Papers

Paper presented at the The 24th U.S. Symposium on Rock Mechanics (USRMS), June 20–23, 1983
Paper Number: ARMA-83-0053
... rock mass principal stress interface element method block assembly contour plot traction Upstream Oil & Gas equation in-situ state computational model stiffness matrix block domain distinct element \ 26ch U.S. Sympostum on Rock Hechantca June 1983 STRESS DISTRIBUTION IN A JOINTED...
Proceedings Papers

Paper presented at the The 23rd U.S Symposium on Rock Mechanics (USRMS), August 25–27, 1982
Paper Number: ARMA-82-628
... conditions. Upstream Oil & Gas discrete element stiffness matrix element domain underground excavation displacement procedure hybrid discrete element-boundary element method formulation Reservoir Characterization element formulation requirement rock mass discrete element method...
Proceedings Papers

Paper presented at the The 23rd U.S Symposium on Rock Mechanics (USRMS), August 25–27, 1982
Paper Number: ARMA-82-604
... storage requirements may be at least partially avoided by the use of "skyline" solution algorithms (Bathe and Wilson, 1976; Zienkiewicz, 1977). The effect on solution time of several large "skyscrapers" in the column skyline of the global stiffness matrix has apparently not been investigated. Another...
Proceedings Papers

Paper presented at the The 18th U.S. Symposium on Rock Mechanics (USRMS), June 22–24, 1977
Paper Number: ARMA-77-0009
... axis crystalline rock plane reduction deformation borehole stiffness matrix initial stress AN ANALYSIS OF DEEP BOREHOLES IN HOT, DRY, CRYSTALLINE ROCK By C. M. St. John, Assistant Professor Department of Civil and Mineral Engineering University of Minnesota Mi nneapol i s, Minnesota ABSTRACT...
Proceedings Papers

Paper presented at the The 18th U.S. Symposium on Rock Mechanics (USRMS), June 22–24, 1977
Paper Number: ARMA-77-0187
... problems. Clearly the method has many advantages for use in rock mechanics problems. The elements can be chosen in anyway and each element has its own stiffness matrix, so that the material need not be homogeneous or isotropic. This study focuses on processes of fracture propagation and faulting in rock...
Proceedings Papers

Paper presented at the The 11th U.S. Symposium on Rock Mechanics (USRMS), June 16–19, 1969
Paper Number: ARMA-69-0237
...)(Available in full paper), and in the plastic range 12 Reservoir Characterization displacement plane-strain condition Upstream Oil & Gas Rock mechanics reservoir geomechanics material property iteration loading stiffness matrix procedure Artificial Intelligence wedge application...
Proceedings Papers

Paper presented at the The 11th U.S. Symposium on Rock Mechanics (USRMS), June 16–19, 1969
Paper Number: ARMA-69-0193
... by finite difference solution of the Laplace equation. The normalized maximum shear stresses 4 max /¿H, where ¿ is the density of the material and H is the height of the vertical slope, are plotted in Fig. 2. material property stress point stiffness matrix Reservoir Characterization Rock...

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