International Journal for Numerical and Analytical Methods in Geomechanics

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Modelling two‐dimensional heat and moisture transfer in unsaturated soils, including gravity effects
International Journal for Numerical and Analytical Methods in Geomechanics - Tập 9 Số 6 - Trang 573-588 - 1985
Hywel Rhys Thomas
AbstractA theoretical model is presented to predict simultaneous transient coupled heat and moisture transfer in partly saturated soils. The formulation is in terms of volumetric moisture content, is two dimensional, includes gravitational flow and takes into account latent heat of vaporization effects. The numerical solution of the problem is accomplished by means of a finite element solution alg... hiện toàn bộ
An accelerated algorithm for parameter identification in a hierarchical plasticity model accounting for material constraints
International Journal for Numerical and Analytical Methods in Geomechanics - Tập 25 Số 3 - Trang 263-272 - 2001
L. Simoni, B. A. Schrefler
AbstractThe parameter identification procedure proposed in this paper is based on the solution of an inverse problem, which relies on the minimization of an error function of least‐squares type. The solution of the ensuing optimization problem, which is a constrained one owing to the presence of physical links between the optimization parameters, is performed by means of a particular technique of ... hiện toàn bộ
An elasto‐viscoplastic model for diatomaceous mudstone and numerical simulation of compaction bands
International Journal for Numerical and Analytical Methods in Geomechanics - Tập 35 Số 2 - Trang 244-263 - 2011
Fusao Oka, Sayuri Kimoto, Yosuke Higo, Hiroki Ohta, Taisuke Sanagawa, Takeshi Kodaka
AbstractIt is well known that highly porous rocks under relatively high confining pressure succumb to volumetric compression with the emergence of the so‐called compaction bands. These normally occur as perpendicular or very slightly inclined deformation bands with respect to the direction of the most compressive principal stress. An experimental study of diatomaceous mudstone, a highly structured... hiện toàn bộ
Modelling of hygro‐thermal behaviour and damage of concrete at temperature above the critical point of water
International Journal for Numerical and Analytical Methods in Geomechanics - Tập 26 Số 6 - Trang 537-562 - 2002
Dariusz Gawin, Francesco Pesavento, Bernhard A. Schrefler
AbstractIn this paper, a model for the analysis of the behaviour of concrete at temperature largely exceeding critical point of water, is presented. In this temperature range liquid phase, i.e. capillary phase, and gas phase cannot be distinguished and only the latter exists. Consequently, capillary pressure has no more physical meaning above this point and liquid water is present only as physical... hiện toàn bộ
Analysis of the solid phase stress tensor in multiphase porous media
International Journal for Numerical and Analytical Methods in Geomechanics - Tập 31 Số 4 - Trang 541-581 - 2007
William G. Gray, Bernhard A. Schrefler
AbstractConservation equations for mass, momentum, energy, and entropy are formulated for the phases and interfaces of a three‐phase system consisting of a solid and two immiscible fluids. The microscale equations are averaged to the macroscale by integration over a representative elementary volume. Thermodynamic statements for each of the phases and interface entities are also formulated at the m... hiện toàn bộ
A new device for investigating the hydro‐mechanical properties of rock joints
International Journal for Numerical and Analytical Methods in Geomechanics - Tập 27 Số 6 - Trang 513-548 - 2003
Julien Hans, M. Boulon
AbstractA new experimental system composed of two devices is presented for studying the hydraulic conductivity of rock joints and other interfaces in relation with their mechanical loading. This system allows for investigations on the anisotropy of the hydraulic conductivity, as well as for its heterogeneity. The first device controls the injection of a fluid, regulated in pressure or discharge ne... hiện toàn bộ
Integral equation solution of heat extraction from a fracture in hot dry rock
International Journal for Numerical and Analytical Methods in Geomechanics - Tập 25 Số 13 - Trang 1327-1338 - 2001
Alexander H.‐D. Cheng, Ahmad Ghassemi, Emmanuel Detournay
AbstractIn the study of heat extraction by circulating water in a fracture embedded in geothermal reservoir, the heat conduction in the reservoir is typically assumed to be one dimensional and perpendicular to the fracture. In this paper, we demonstrate that by an integral equation formulation utilizing Green's function, the multi‐dimensional heat flow in the reservoir can be modelled. In the resu... hiện toàn bộ
Modeling three‐dimensional hydraulic fracture propagation using virtual multidimensional internal bonds
International Journal for Numerical and Analytical Methods in Geomechanics - Tập 37 Số 13 - Trang 2021-2038 - 2013
Kai Huang, Z. Zhang, Ahmad Ghassemi
SUMMARYPropagation of fractures, especially those emanating from wellbores and closed natural fractures, often involves Mode I and Mode II, and at times Mode III, posing significant challenges to its numerical simulation. When an embedded inclined fracture is subjected to compression, the fracture edge is constrained by the surrounding materials so that its true propagation pattern cannot be simul... hiện toàn bộ
A SPH framework for dynamic interaction between soil and rigid body system with hybrid contact method
International Journal for Numerical and Analytical Methods in Geomechanics - Tập 44 Số 10 - Trang 1446-1471 - 2020
Ling Zhan, Chong Peng, Bingyin Zhang, Wei Wu
SummaryA smoothed particle hydrodynamics (SPH) framework for three‐dimensional dynamic soil‐multibody interaction modeling is presented, where both soils and rigid bodies are discretized using SPH particles. In the framework, soils are modeled using the Drucker‐Prager model, while rigid bodies are considered with a multibody dynamics solver. A hybrid contact method suitable for three‐dimensional s... hiện toàn bộ
Frictional contact algorithms in SPH for the simulation of soil–structure interaction
International Journal for Numerical and Analytical Methods in Geomechanics - Tập 38 Số 7 - Trang 747-770 - 2014
Jian Wang, Dave Chan
SUMMARYSimulation of frictional contact between soils and rigid or deformable structure in the framework of smoothed particle hydrodynamics (SPH) is presented in this study. Two algorithms are implemented into the SPH code to describe contact behavior, where the contact forces are calculated using the law of conservation of momentum based on ideal plastic collision or using the criteria of partial... hiện toàn bộ
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