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Author: William Michael Coombs
Publisher:
ISBN:
Category : Clay
Languages : en
Pages :
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Book Description
This thesis is concerned with the theoretical development and numerical implementation of efficient constitutive models for the analysis of particulate media (specifically clays) in structures undergoing geometrically non-linear behaviour. The Mohr-Coulomb and modified Cam-clay constitutive models have both been examined and extended to provide greater realism. Findings from this thesis will interest engineers working in numerical methods in solid mechanics, along with those investigating continuum mechanics, inelastic constitutive modelling and large strain plasticity. Although focused on soil plasticity, this research has relevance to other areas, such as metal forming and bio-engineering. Initially the concepts of material and geometric non-linearity are reviewed. A general implicit backward Euler stress integration algorithm is detailed, including the derivation of the algorithmic consistent tangent. A framework for the analysis of anisotropic finite deformation elasto-plasticity is presented and a full incremental finite-element formulation provided. The first constitutive model developed in this thesis is a non-associated frictional perfect plasticity model based on a modified Reuleaux triangle. It is shown, through comparison with experimental data, that this model has advantages over the classical Mohr-Coulomb and Drucker-Prager models whilst still allowing for analytical implicit stress integration. An isotropic hyperplastic family of models which embraces the concept of a Critical State is then developed. This family is extended to include inelastic behaviour within the conventional yield surface and a Lode angle dependency on the anisotropic yield function which maintains convexity of both the surface and uniqueness of the Critical State cone. A calibration procedure is described and the integration and linearisation of the constitutive relations are detailed. All of the developed models are compared with established experimental data. Finally the models are verified for use within finite deformation finite-element analyses. The importance of deriving the algorithmic consistent tangent is demonstrated and the influence of varying levels of model sophistication assessed in terms of both global behaviour and simulation run-time.
Author: William Michael Coombs
Publisher:
ISBN:
Category : Clay
Languages : en
Pages :
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Book Description
This thesis is concerned with the theoretical development and numerical implementation of efficient constitutive models for the analysis of particulate media (specifically clays) in structures undergoing geometrically non-linear behaviour. The Mohr-Coulomb and modified Cam-clay constitutive models have both been examined and extended to provide greater realism. Findings from this thesis will interest engineers working in numerical methods in solid mechanics, along with those investigating continuum mechanics, inelastic constitutive modelling and large strain plasticity. Although focused on soil plasticity, this research has relevance to other areas, such as metal forming and bio-engineering. Initially the concepts of material and geometric non-linearity are reviewed. A general implicit backward Euler stress integration algorithm is detailed, including the derivation of the algorithmic consistent tangent. A framework for the analysis of anisotropic finite deformation elasto-plasticity is presented and a full incremental finite-element formulation provided. The first constitutive model developed in this thesis is a non-associated frictional perfect plasticity model based on a modified Reuleaux triangle. It is shown, through comparison with experimental data, that this model has advantages over the classical Mohr-Coulomb and Drucker-Prager models whilst still allowing for analytical implicit stress integration. An isotropic hyperplastic family of models which embraces the concept of a Critical State is then developed. This family is extended to include inelastic behaviour within the conventional yield surface and a Lode angle dependency on the anisotropic yield function which maintains convexity of both the surface and uniqueness of the Critical State cone. A calibration procedure is described and the integration and linearisation of the constitutive relations are detailed. All of the developed models are compared with established experimental data. Finally the models are verified for use within finite deformation finite-element analyses. The importance of deriving the algorithmic consistent tangent is demonstrated and the influence of varying levels of model sophistication assessed in terms of both global behaviour and simulation run-time.
Author: Boris Jeremić
Publisher:
ISBN:
Category : Deformations (Mechanics)
Languages : en
Pages : 310
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Book Description
Author: V.A. Rinaldi
Publisher: IOS Press
ISBN: 1614996016
Category : Science
Languages : en
Pages : 1236
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Book Description
In November 2015, Buenos Aires, Argentina became the location of several important events for geo-professionals, with the simultaneous holding of the 6th International Symposium on Deformation Characteristics of Geomaterials, the 15th Pan-American Conference on Soil Mechanics and Geotechnical Engineering (XV PCSMGE), the 8th South American Congress on Rock Mechanics (SCRM), as well as the 22nd Argentinean Congress of Geotechnical Engineering (CAMSIGXXII). This synergy provided a unique opportunity to exchange ideas and discuss current and future practices in the areas of soil mechanics and rock mechanics, and their applications in civil, energy, environmental, and mining engineering. This book presents the proceedings of the 6th International Symposium on Deformation Characteristics of Geomaterials. As well as 118 articles selected for publication after peer review, it includes 7 lectures delivered by invited keynote speakers and the Third Bishop Lecture, delivered by Professor Herve Di Benedetto of the University of Lyon, France, who presented a reference work on the advanced testing and modeling of bituminous bounded and unbounded granular materials. The conference brought together practitioners, researchers and educators from around the world engaged in the understanding of the deformation properties of geo-materials before failure, and the small strain parameters as fundamental characteristics of geo-materials. The main topics covered by the symposium include experimental investigations from very small strains to beyond failure, including multi-physical approach; HTC M coupling behavior, characterization and modeling of various geo-materials and interfaces; and practical prediction and interpretation of ground responses: field observation and case histories.
Author: António S. Cardoso
Publisher: CRC Press
ISBN: 1351003607
Category : Technology & Engineering
Languages : en
Pages : 2430
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Book Description
Numerical Methods in Geotechnical Engineering IX contains 204 technical and scientific papers presented at the 9th European Conference on Numerical Methods in Geotechnical Engineering (NUMGE2018, Porto, Portugal, 25—27 June 2018). The papers cover a wide range of topics in the field of computational geotechnics, providing an overview of recent developments on scientific achievements, innovations and engineering applications related to or employing numerical methods. They deal with subjects from emerging research to engineering practice, and are grouped under the following themes: Constitutive modelling and numerical implementation Finite element, discrete element and other numerical methods. Coupling of diverse methods Reliability and probability analysis Large deformation – large strain analysis Artificial intelligence and neural networks Ground flow, thermal and coupled analysis Earthquake engineering, soil dynamics and soil-structure interactions Rock mechanics Application of numerical methods in the context of the Eurocodes Shallow and deep foundations Slopes and cuts Supported excavations and retaining walls Embankments and dams Tunnels and caverns (and pipelines) Ground improvement and reinforcement Offshore geotechnical engineering Propagation of vibrations Following the objectives of previous eight thematic conferences, (1986 Stuttgart, Germany; 1990 Santander, Spain; 1994 Manchester, United Kingdom; 1998 Udine, Italy; 2002 Paris, France; 2006 Graz, Austria; 2010 Trondheim, Norway; 2014 Delft, The Netherlands), Numerical Methods in Geotechnical Engineering IX updates the state-of-the-art regarding the application of numerical methods in geotechnics, both in a scientific perspective and in what concerns its application for solving practical boundary value problems. The book will be much of interest to engineers, academics and professionals involved or interested in Geotechnical Engineering.
Author: H. DiBenedetto
Publisher: CRC Press
ISBN: 0415367018
Category : Science
Languages : en
Pages : 260
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Book Description
Solutions for soil engineering and soil-structure interaction problems need realistic and pertinent experimental and modelling tools. In this work, extensive developments proposed by the invited speakers of the Lyon International Symposium held in September 2003 are presented, including experimental investigations into deformation properties; laboratory, in-situ and field observation interpretations; behaviour characterisation and modelling; and case histories. The contributions include recent investigations into anisotropy and non-linearity, the effects of stress-strain-time history, ageing and time effects, yielding, failure and flow, cyclic and dynamic behaviour. In addition, advanced geotechnical testing is applied to real engineering problems, and to ways of synthesising information from a range of sources while engaging in practical site characterisation studies.
Author: Jamiolkowski
Publisher: CRC Press
ISBN: 9789058090775
Category : Deformations (Mechanics)
Languages : en
Pages : 496
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Book Description
The second of two volumes from the 1999 conference (v.1 was published in 1999) makes available the opening lecture on pre-failure behavior of soils as construction materials, as well as 24 contributions on various themes of the conference, laboratory tests, in situ tests, stress-strain behavior, applications and case histories. Some specific topics include time-dependent deformation characteristics of stiff geomaterials, boundary value problems in geotechnical engineering, and the effect of reinforcement due to choice of geogrid. There is no subject index. c. Book News Inc.
Author: Kenichi Soga
Publisher: CRC Press
ISBN: 1315737329
Category : Technology & Engineering
Languages : en
Pages : 1668
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Book Description
Geomechanics from Micro to Macro contains 268 papers presented at the International Symposium on Geomechanics from Micro and Macro (IS-Cambridge, UK, 1-3 September 2014). The symposium created a forum for the dissemination of new advances in the micro-macro relations of geomaterial behaviour and its modelling. The papers on experimental investigati
Author: Lynsey Reese
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Experimental tests of geo-materials interacting with rigid bodies under impact loading were conducted to collect critical information about the behavior of such systems. Full-scale vehicular tests were conducted to assess the performance and behavior of single boulders embedded in AASHTO uniformly-graded coarse aggregate soil as an anti-ram vehicle barrier, while drop weight tests were conducted on expanded polystyrene crushable concrete to develop a material model capable of incorporating strain rate effects for use in vehicle barrier designs. Numerical models were developed for each experimental test to calibrate material constitutive models. Four full-scale vehicular tests were conducted to assess the performance and behavior of single boulders embedded in compacted AASHTO soil. LS-DYNA numerical models were developed and a soil constitutive model was calibrated based on a full-scale test with minimal soil movement. Each full-scale test progressed to larger boulder translation and rotation and soil deformation with the last test exhibiting boulder rotation out of the ground. Two modeling techniques were recommended based on the expected boulder and soil deformation. For small deformations, traditional finite element method (FEM) can be used for the boulder and soil domain. For large deformations, a hybrid approach combining Smoothed Particle Hydrodynamics (SPH) near areas of large deformation and FEM in areas of minimal deformation for soil was developed. Both numerical methods used the same calibrated constitutive model, Mohr-Coulomb failure criterion, for compacted AASHTO soil.A crushable concrete mix design was tested where expanded polystyrene was used as the primary cell material to take advantage of its energy dissipating properties. Quasi-static and dynamic drop weight tests were conducted on fully confined specimens to help determine material constitutive properties for numerical modeling. A LS-DYNA model, using Material Type 16, Pseudo Tensor, was developed to simulate both the quasi-static and dynamic drop weight tests. The numerical model was able to capture the overall responses of the specimens during the quasi-static testing and consecutive impacts from the dynamic drop weight tests. Several compressed specimens from the dynamic drop weight test, representing different strain levels, were studied using non-destructive X-ray CT imaging to ascertain damage levels. From the CT scans, the volume of concrete with respect to voids along the height of each specimen could be determined. As the level of dynamic compression increased, the volume of concrete increased and the voids decreased, showing that the polystyrene beads were being crushed. Also, the bottom of the specimen exhibited higher amounts of crushing of the polystyrene beads. This was likely due to reflective waves from the bottom steel platen used to support and confine the concrete specimen.
Author: M. Jamiolkowski
Publisher: CRC Press
ISBN: 9789058090768
Category : Deformations (Mechanics)
Languages : en
Pages : 968
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Book Description
Author: C.-K. Chung
Publisher: IOS Press
ISBN: 1607508222
Category : Technology & Engineering
Languages : en
Pages : 1382
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Book Description
This book is the international edition of the proceedings of IS-Seoul 2011, the Fifth International Symposium on Deformation Characteristics of Geomaterials, held in Seoul, South Korea, in September 2011.The book includes 7 invited lectures, as well as 158 technical papers selected from the 182 submitted. The symposium explored ideas about the complex load-deformation response in geomaterials, including laboratory methods for small and large strains; anisotropy and localization; time-dependent responses in soils; characteristics of treated, unsaturated, and natural geomaterials; applications in field methods; evaluation of field performance in geotechnical structures; and physical and numerical modeling in geomechanics. These topics were grouped under a number of main themes, including experimental investigations from very small strains to beyond failure; behavior, characterization and modeling of various geomaterials; and practical prediction and interpretation of ground response: field observation and case histories. Both the symposium and this book represent an important contribution to the exchange of advanced knowledge and ideas in geotechnical engineering and promote partnership among participants worldwide.
