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Boundary-value problem/es

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Proceedings Papers

Paper presented at the ISRM International Symposium, May 26–28, 1982
Paper Number: ISRM-IS-1982-132
... nichtline arem Materialverhalten ist eine iterative Lásung der Gleichungen nátig. Hierfür gibt es verschiedenste Iterationsstrategien, die abadngig vom Problem mehr oder weniger ef fektiv sind. Bei Kriechproblemen ist es üblich in Rich tung der Zeitachse eine inkrementelle Vor gehensweise zu wdhlen, d.h...
Proceedings Papers

Paper presented at the SPE Reservoir Simulation Symposium, February 23–25, 2015
Paper Number: SPE-173233-MS
... Abstract The ensemble smoother with multiple data assimilation (ES-MDA) has been shown to outperform EnKF for both synthetic and field problems. Specifically, ES-MDA gives better data matches than EnKF, maintains the correct geology and appears to provide a better quantification of uncertainty...
Proceedings Papers

Paper presented at the 8th ISRM Congress, September 25–29, 1995
Paper Number: ISRM-8CONGRESS-1995-122
... it is expedient by taking into account the features of each class of problems to create the calculating schemes that allow us to produce exact enough results for minimum computation time. Reservoir Characterization accuracy main system subelement BEM Artificial Intelligence calculation boundary...
Proceedings Papers

Paper presented at the 5th ISRM Congress, April 10–15, 1983
Paper Number: ISRM-5CONGRESS-1983-226
... by one, can be used relatively easily to obtain displacements and stresses in multiply connected bodies of arbitary shape, treats uniform and mixed boundary value problems with equal ease, and requires only specification data on the boundary of the region being considered, as a consequence...
Proceedings Papers

Paper presented at the 2009 SEG Annual Meeting, October 25–30, 2009
Paper Number: SEG-2009-0674
... and therefore assume an exp(-iwt) time dependency throughout the following. Boundary value problem We solve the vector Helmholtz equation in terms of the secondary electric field Es within the domainWsubject to a homogeneous Dirichlet boundary condition on ??. µ, s and e respectively denote magnetic...
Proceedings Papers

Paper presented at the 6th ISRM Congress, August 30–September 3, 1987
Paper Number: ISRM-6CONGRESS-1987-140
... problem for proper values: {U} = w2 [D) [M] {U} (4) or [0] (M] ful = A {u} ~ (5) where [0] = C Kfl - matrix of compliance. Basing on the proper values ~i calculated are the periods of natural modes of analysed slope T = 2,r fii (6) and frequencies Wi =/1/ }.i (7) Dynamic response factors Bi are determined...
Proceedings Papers

Paper presented at the 6th ISRM Congress, August 30–September 3, 1987
Paper Number: ISRM-6CONGRESS-1987-214
... ABSTRACT: Conditions which are decisive for the stability of deep underground excavations are investigated in a numerical study. First a nonassociated elasto-plastic constitutive relation for brittle materials is derived. It is shown that an originally load controlled boundary value problem...
Proceedings Papers

Paper presented at the 1st ISRM Congress, September 25–October 1, 1966
Paper Number: ISRM-1CONGRESS-1966-175
... Dieser Artikel befasst sich mit den Aus- wirkungen des Tunnelbaus in geschichtetem Gebirge (im Gegensatz zu homogenem Ge- birge). Es ergeben sich USsungen fur das Problem der ebenen Dehnungsgrenzwert mit Hilfe der Analyse eines begrenzten Elements. Wenn ein kreisrunder Tunnel entlang eines vertikalen...
Proceedings Papers

Paper presented at the ISRM International Symposium - EUROCK 96, September 2–5, 1996
Paper Number: ISRM-EUROCK-1996-097
... sogenannte "Mantes à Hydrobies" wird gezeigt. Dann wird die Modellierung mittels finiter Elemente beschrieben. Das Bohrloch ist einen Meter breit. Es wurde von einer Galerie in 508 Metern Tiefe aus gebohrl. Das Problem wird in verschiedenen Schwierigkeitsstufen betrachtet: horizontal homogene und isotrope...
Proceedings Papers

Paper presented at the 7th ISRM Congress, September 16–20, 1991
Paper Number: ISRM-7CONGRESS-1991-308
... ABSTRACT: Ground stress determinations have become routine for many large construction and mining projects. However, the problem remains that it is difficult to obtain results representative for design. Difficulties may arise from, Poorly defined areas of homogeneity in the rock mass...
Proceedings Papers

Paper presented at the 4th ISRM Congress, September 2–8, 1979
Paper Number: ISRM-4CONGRESS-1979-171
... assumptions regarding the magnitude of the deformations (particularly rotations) are made for derivation of the above relations which might unnecessarily limit their applicability only to special boundary value problems. RESUME: D'abord nous representons les proprietes les plus importantes des roches...
Proceedings Papers

Paper presented at the 5th ISRM Congress, April 10–15, 1983
Paper Number: ISRM-5CONGRESS-1983-168
..., pour determiner les proprietes d'efforts et de contraintes du charbon, du massif et des eboulis de foudroyage. ZUSAMMENFASSUNG: Es wird eine dreidimensionale Verschiebungsunstetigkeits-Methode der Spannungsanalyse bei praktischen Grubenanordnungen in einem geschichteten, anisotropen Gebirgskörper...
Proceedings Papers

Paper presented at the 7th ISRM Congress, September 16–20, 1991
Paper Number: ISRM-7CONGRESS-1991-146
... of the heterogeneous massif surrounding the working and also the borders of conditioned zones of monoelastic deformation i.e. einen grubenbau contact problem Interlace action ot cross-section outline correspondence distinguant par leur caracteristique initial stress correspondingly Equality boundary...
Proceedings Papers

Paper presented at the 5th ISRM Congress, April 10–15, 1983
Paper Number: ISRM-5CONGRESS-1983-174
... route relies on exact models of linear elastic media. In this case the solution of the boundary value problem involving a face element yields F and G and, if the mining layout is specified, the distribution of convergence also can be derived. metals & mining machine learning Directional...
Proceedings Papers

Paper presented at the 8th ISRM Congress, September 25–29, 1995
Paper Number: ISRM-8CONGRESS-1995-076
... scheme for non- linear boundary value problems. In these anisotropic continuum models the concept of "deformation equivalence" is adopted, in which both the joint system and the intact material contribute to the overall rock mass compliance. A matrix procedure is introduced to derive a constitutive law...
Proceedings Papers

Paper presented at the ISRM International Symposium, August 31–September 3, 1986
Paper Number: ISRM-IS-1986-040
... abgemessenen Spannungsfelder und die Herstellung der entsprechenden Grenzzustände für die Entwurf werden auch dargestellt. INTRODUCTION Since problems in rock engineering were first approached on a fundamental mechanics basis (requiring a knowledge of the rock properties and the boundary conditions...
Proceedings Papers

Paper presented at the SPE Reservoir Simulation Conference, April 10–11, 2019
Paper Number: SPE-193849-MS
... the performance to GA. The parameters are set to default values as suggested in [ 24 ]. The implementation utilizes the open-source ES package DEAP [ 18 ]. The standard CMA-ES only solves unconstrained problem. To accommodate box constraints, we use sigmoid functions to transform an unconstrained variable...
Proceedings Papers

Paper presented at the 4th ISRM Congress, September 2–8, 1979
Paper Number: ISRM-4CONGRESS-1979-157
... shear strength values is somewhat more expensive but results in a saving of anchor forces of about 30 % in the particular case. Further, the consequences of the choice of the safety definition on the analytical slope stability are generally explained. RESUME: Dans les problemes de stabilite de talus...
Proceedings Papers

Paper presented at the 2006 SEG Annual Meeting, October 1–6, 2006
Paper Number: SEG-2006-0914
... based on gravity and magnetic data. However, two problems were also reported in the conventional implementations of ES, both related to using discrete ES grids (Cordell, 1992). First, the approximation of the equivalent source surface by point sources often leads to poor stability of the inversion...
Proceedings Papers

Paper presented at the 1st ISRM Congress, September 25–October 1, 1966
Paper Number: ISRM-1CONGRESS-1966-211
... Ergebnisse scheinen der Wirklichkeit ziemlich zu entsprechen, und geben die volumetrische Ausdehnung wieder, welche das Ergebniss begleitet, so wie es durch die angewandten Druck- und Spannungsverhàltnisse angedeutet wird. Introduction One of the common problems in rock mechanics is that of estimating...

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