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 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 me...... hiện toàn bộ
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...... 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 ...... 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 diatomace...... 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 reser...... 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 pr...... hiện toàn bộ
A three‐dimensional micromechanically based model
International Journal for Numerical and Analytical Methods in Geomechanics - Tập 41 Số 17 - Trang 1669-1686 - 2017
Hao Xiong, François Nicot, Zhen‐Yu Yin
SummaryGranular materials react with complicated mechanical responses when subjected to external loading paths. This leads to sophisticated constitutive formulations requiring large numbers of parameters. A powerful and straightforward way consists in developing micro‐mechanical models embedding both micro‐scale and meso‐scale. This paper proposes a 3D micro‐mechan...... hiện toàn bộ
Bivariate simulation using copula and its application to probabilistic pile settlement analysis
International Journal for Numerical and Analytical Methods in Geomechanics - Tập 37 Số 6 - Trang 597-617 - 2013
Dian‐Qing Li, Xiao‐Song Tang, Kok‐Kwang Phoon, Yi‐Feng Chen, Chuangbing Zhou
SUMMARYThis paper aims to propose a procedure for modeling the joint probability distribution of bivariate uncertain data with a nonlinear dependence structure. First, the concept of dependence measures is briefly introduced. Then, both the Akaike Information Criterion and the Bayesian Information Criterion are adopted for identifying the best‐fit copula. Thereafte...... hiện toàn bộ
Chemo‐mechanics of cemented granular solids subjected to precipitation and dissolution of mineral species
International Journal for Numerical and Analytical Methods in Geomechanics - Tập 40 Số 9 - Trang 1295-1320 - 2016
Giuseppe Buscarnera, Arghya Das
SummaryThis paper studies the chemo‐mechanics of cemented granular solids in the context of continuum thermodynamics for fluid‐saturated porous media. For this purpose, an existing constitutive model formulated in the frame of the Breakage Mechanics theory is augmented to cope with reactive processes. Chemical state variables accounting for the reactions between th...... hiện toàn bộ
Shortest link method for contact detection in discrete element method
International Journal for Numerical and Analytical Methods in Geomechanics - Tập 30 Số 8 - Trang 783-801 - 2006
Erfan G. Nezami, Youssef M. A. Hashash, Dawei Zhao, Jamshid Ghaboussi
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