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Instabilities in Sands
Instabilities in Sands
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Nombre: Alfonso Mariano Ramos Cañón
Area temática: Ingeniería
ISBN/ISSN: 978-958-695-662-8

The purpose of this dissertation is to contribute to the detection of the onset of geomechanical instabilities in sands under dry/drained and saturated/undrained conditions. ln order to accomplish this objective, a framework for detecting instabilities based on either a mathematical concept (i.e., loss of uniqueness - bifurcation) or physical one (i.e., Hill 's instability) is generated to derived criteria applicable to the most common instabilities: localized drained instability in dense sands (shear bands), diffuse undrained instability in loose sands (Iiquefaction) and diffuse drained instability in loose and dense sands (debris flow). Each one of these three instabilities is studied independently. The criteria are compared against experimental results available in the literature, and reasonable agreement is achieved. From a practical perspective, the contributions of this work expand the repertoire of potential instabilities that have been reported in case studies of puzzling slope instability failures under drained and undrained conditions.

 

Contenido : Table of Contents.—Acknowledgements.—1. Introduction. 1.1. The problem. 1.2. Aim. 1.3. Outline.—2. Theoretical Framework of Instabilities in Sands. 2.1. Second-Order Work. 2.2. Loss of Uniqueness – Bifurcation. 2.3. Shear Bands Bifurcation.—3. Constitutive Models. 3.1. Von Wolffersdorff Hypoplastic Constitutive Model. 3.2. Manzari - Dafalias Elastoplastic Constitutive Model.—4. Strain Localization Based on the Bifurcation Theory: An Application for use with the Hypoplastic Constitutive Model. 4.1. Aspects Affecting Shear Bands in Finite Element Simulations. 4.2. Bifurcation Analysis under Plane Strain Conditions. 4.3. Bifurcation Analysis for a General Stress Path.—5. Diffuse Instability in Sand under Undrained Loading Conditions – Liquefaction. 5.1. Definitions of Liquefaction. 5.2. Flow Liquefaction Criterion. 5.3. Applicability of Criterion for Detecting the Onset of Flow Liquefaction. 5.4. Predictions of Flow Liquefaction. 5.5. Numerical Analysis of the Influence of Picnotropy, Barotropy and Anisotropy of Initial Stresses on the Onset of Flow Liquefaction under Static Loading Conditions.—6. Diffuse Instability in Sand Under Drained Loading Conditions. 6.1. Introduction. 6.2. Drained Instability Criterion. 6.3. Numerical Predictions. 6.4. Discussion. 6.5. Concluding Remarks.—7. Conclusions. 7.1. Summary. 7.2. Recommendations for Further Study.—Appendix A. Loss of Uniqueness under Mixed Controlled Test. A.1. Loss of Uniqueness on Stress Controlled Test. A.2. Loss of Uniqueness in Strain Controlled Test. A.3. Test under Mixed Stress and Strain Control. A.4. Shear Band Analysis Based on Nova's Concept.—Appendix B. Integration of Hypoplastic Constitutive Model.—Appendix C. Integration of the Manzari Dafalias Constitutive Model. C.1. Midpoint Rule Algorithm. C.2. Back Euler Algorithm. Implicit Integration. C.3. Analytical Derivatives for the Implicit Algorithm. References.
Editorial: Universidad de los Andes, Facultad de Ingeniería, Departamento de Ingeniería Civil y Ambiental
Edición: Primera edición
Fecha de publicación: Septiembre de 2011

Formato: 17 x 24 cm
Paginas: 246
Colección: Tesis Doctorales
Idioma: Inglés
Disponibilidad: En stock


Precio: $56.700

 
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