International Journal for Numerical and Analytical Methods in Geomechanics
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An accelerated algorithm for parameter identification in a hierarchical plasticity model accounting for material constraintsAbstract The 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 me... ...
International Journal for Numerical and Analytical Methods in Geomechanics - Tập 25 Số 3 - Trang 263-272 - 2001
Modelling two‐dimensional heat and moisture transfer in unsaturated soils, including gravity effectsAbstract A 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... ...
International Journal for Numerical and Analytical Methods in Geomechanics - Tập 9 Số 6 - Trang 573-588 - 1985
An elasto‐viscoplastic model for diatomaceous mudstone and numerical simulation of compaction bandsAbstract It 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 diatomace... ...
International Journal for Numerical and Analytical Methods in Geomechanics - Tập 35 Số 2 - Trang 244-263 - 2011
Modelling of hygro‐thermal behaviour and damage of concrete at temperature above the critical point of waterAbstract In 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 ... ...
International Journal for Numerical and Analytical Methods in Geomechanics - Tập 26 Số 6 - Trang 537-562 - 2002
Analysis of the solid phase stress tensor in multiphase porous mediaAbstract Conservation 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 enti... ...
International Journal for Numerical and Analytical Methods in Geomechanics - Tập 31 Số 4 - Trang 541-581 - 2007
A new device for investigating the hydro‐mechanical properties of rock jointsAbstract A 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, regu... ...
International Journal for Numerical and Analytical Methods in Geomechanics - Tập 27 Số 6 - Trang 513-548 - 2003
Integral equation solution of heat extraction from a fracture in hot dry rockAbstract In 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 reser... ...
International Journal for Numerical and Analytical Methods in Geomechanics - Tập 25 Số 13 - Trang 1327-1338 - 2001
Modeling three‐dimensional hydraulic fracture propagation using virtual multidimensional internal bondsSUMMARY Propagation 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 pr... ...
International Journal for Numerical and Analytical Methods in Geomechanics - Tập 37 Số 13 - Trang 2021-2038 - 2013
A SPH framework for dynamic interaction between soil and rigid body system with hybrid contact methodSummary A 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... ...
International Journal for Numerical and Analytical Methods in Geomechanics - Tập 44 Số 10 - Trang 1446-1471 - 2020
Frictional contact algorithms in SPH for the simulation of soil–structure interactionSUMMARY Simulation 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... ...
International Journal for Numerical and Analytical Methods in Geomechanics - Tập 38 Số 7 - Trang 747-770 - 2014
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