Search results for: localisation-and-bifurcation-theory-for-soils-and-rocks

Localisation and Bifurcation Theory for Soils and Rocks

Author : R. Chambon
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Bifurcation and Localisation Theory in Geomechanics

Author : A.V. Dyskin
File Size : 64.53 MB
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This work contains proceedings of a workshop on Bifurcation and Localisation Theory in Geomechanics, held in Perth, Australia in 1999. It covers a range of themes from classic civil engineering subjects to non-linear and non-unique geological phenomena.

Constitutive Modelling of Granular Materials

Author : Dimitrios Kolymbas
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In view of its extreme complexity the mathematical description of the mechanical behaviour of granular materials is an extremely difficult task. Today many different models compete with each other. However, the complexity of the models hinders their comparison, and the potential users are confused and, often, disencouraged. This book is expected to serve as a milestone in the present situation, to evaluate the present methodes, to clear up the situation, to focus and encourage for further research activities.

The Relationship Between Damage and Localization

Author : Helen Lewis
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The many kinds of porous geomaterials (rocks, soils, concrete, etc.) exhibit a range of responses when undergoing inelastic deformation. In doing so they commonly develop well-ordered fabric elements, forming fractures, shear bands and compaction bands, so creating the planar fabrics that are regarded as localization. Because these induced localization fabrics alter the bulk material properties (such as permeability, acoustic characteristics and strength), it is important to understand how and why localization occurs, and how it relates to its setting. The concept of damage (in several uses) describes both the precursor to localization and the context within which it occurs. A key theme is that geomaterials display a strong material evolution during deformation, revealing a close linkage between the damage and localization processes. This volume assembles perspectives from a number of disciplines, including soil mechanics, rock mechanics, structural geology, seismic anisotropy and reservoir engineering. The papers range from theoretical to observational, and include contributions showing how the deformed geomaterial's emergent bulk characteristics, like permeability and seismic anisotropy, can be predicted.

Localization and Bifurcation Theory for Soils and Rocks

Author : Adachi Toshihisa
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Strain localization, bifurcation and plastic instability phenomena play important roles as precursors of failure of geomaterials. In geomechanics, it has been recognized that stiff soils such as overconsolidated or cemented soils are progressively strained and reach failure with shear banding and that a strain-softening phenomenon in the stress-strain relation is observed on a macroscopic level. The proper modelling of strain localization and bifurcation phenomena and its role in deformation and progressive can be very significant in such engineering problems as slope stability, liquefaction, borehole stability, the stability of foundations, embankments, retaining walls, excavations and faulting, etc. Theoretical work has been directed towards developing constitutive models and analyzing strain localization. In experimental works, much effort has been made to gain insight into the development of shear bands and the measuring of shear band structures. In geotechnical practice, it is often pointed out that existing designing and/or construction techniques should be reevaluated for dealing with geostructures, which are prone to progressive failure.

Numerical Models in Geomechanics

Author : G.N. Pande
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In this volume a number of developments on a variety of topics have been reported. These topics include: partially saturated soil; instabilities in soil behaviour; environmental geomechanics; parallel computing; and applications to tunnels, embankments, slopes, foundations and anchors.

Mechanics of Jointed and Faulted Rock

Author : H.P. Rossmanith
File Size : 28.82 MB
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Topics covered in this text include: geology and structural geology; mechanics; dynamics of jointed and faulted rock; physical modelling and testing; constitutive modelling; seismicity and tectonics; instrumentation; hydraulics; and applications.

Modelling of Cohesive Frictional Materials

Author : P.A. Vermeer
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This progressive volume of lectures, written by leading experts on current developments in the field, is a must-read for engineers in physics, mechanics and engineering applications alike. Focusing on both continuous and discontinuous modelling, this topical symposium raises the issue of cohesive-frictional materials and the importance of understan

IUTAM Symposium on Theoretical and Numerical Methods in Continuum Mechanics of Porous Materials

Author : Wolfgang Ehlers
File Size : 58.98 MB
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During the last decades, continuum mechanics of porous materials has achieved great attention, since it allows for the consideration of the volumetrically coupled behaviour of the solid matrix deformation and the pore-fluid flow. Naturally, applications of porous media models range from civil and environmental engineering, where, e. g. , geote- nical problems like the consolidation problem are of great interest, via mechanical engineering, where, e. g. , the description of sinter materials or polymeric and metallic foams is a typical problem, to chemical and biomechanical engineering, where, e. g. , the complex structure of l- ing tissues is studied. Although these applications are principally very different, they basically fall into the category of multiphase materials, which can be described, on the macroscale, within the framework of the well-founded Theory of Porous Media (TPM). With the increasing power of computer hardware together with the rapidly decreasing computational costs, numerical solutions of complex coupled problems became possible and have been seriously investigated. However, since the quality of the numerical solutions strongly depends on the quality of the underlying physical model together with the experimental and mathematical possibilities to successfully determine realistic material parameters, a successful treatment of porous materials requires a joint consideration of continuum mechanics, experimental mechanics and numerical methods. In addition, micromechanical - vestigations and homogenization techniques are very helpful to increase the phenomenological understanding of such media.

Bifurcation and Degradation of Geomaterials in the New Millennium

Author : Kam-Tim Chau
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This book contains contributions to the 10th International Workshop on Bifurcation and Degradation in Geomaterials held in Hong Kong, May 28-30, 2014. This event marks the silver Jubilee anniversary of an international conference series dedicated to the research on localization, instability, degradation and failure of geomaterials since 1988 when its first workshop was organized in Germany. This volume of book collects the latest progresses and state-of-the-art research from top researchers around the world, and covers topics including multiscale modeling, experimental characterization and theoretical analysis of various instability and degradation phenomena in geomaterials as well as their relevance to contemporary issues in engineering practice. This book can be used as a useful reference for research students, academics and practicing engineers who are interested in the instability and degradation problems in geomechanics and geotechnical engineering.