Constitutive Modeling of Geomaterials Principles and Applications

Winner of the Japanese Geotechnical Society 2016 publication award Written by a veteran geotechnical engineer with a long record of research discoveries,Constitutive Modeling of Geomaterials: Principles and Applicationspresents a simple and unified approach to modeling various features of geomaterials in general stress systems. The book discusses the fundamentals of the constitutive modeling of soils and illustrates the application of these models to boundary value problems. Helping readers easily understand the fundamentals and modeling of soil behaviors, the author first explains the ideas and formulations for modeling soil features in one-dimensional conditions. He then extends the one-dimensional models to three-dimensional models using the tij concept. The text covers the subloading tij model and other methods that describe density, bonding, time effect, and more. Moving on to the practical application of the constitutive models, the author presents the numerical simulations of typical geotechnical problems (numerical modeling) and the corresponding model tests (physical modeling). Using a framework that leads to a unified set of material parameters, this book shows how to formulate a constitutive model capable of simulating the main features of soil behavior. It not only covers recent methods and models but also uses real test data to prove their reliability.

Introduction PART 1: MODELING OF GEOMATERIALSFundamentals of Conventional ElastoplasticityIntroduction One-dimensional modeling of elastoplastic materials Multidimensional modeling of elastoplastic materials Modeling of One-Dimensional Soil BehaviorIntroduction Modeling of normally consolidated soils—conventional elastoplastic modeling Modeling of overconsolidated soils—advanced elastoplastic modeling at stage I Modeling of structured soils (naturally deposited soils)—advanced elastoplastic modeling at stage II Modeling of other features of soils—advanced elastoplastic modeling at stage III Loading condition using increment of total change of void ratio and explicit expression in advanced elastoplastic modeling Application of the advanced model (stage III) to time-dependent behavior of soilMeaning of present time-dependent model—common and different points to Sekiguchi model Simulation of time-dependent behavior of soil in one-dimensional conditions Application of advanced methods to modeling of some other features Ordinary Modeling of Three-Dimensional Soil BehaviorIntroduction Outline of ordinary elastoplastic models such as the Cam clay model Discussion on applicability of Cam clay type model in three-dimensional conditions based on test results Unified Modeling of Three-Dimensional Soil Behavior Based on the tij Concept Introduction Concept of modified stress tijThree-dimensional modeling of normally consolidated soils based on the tij concept Three-Dimensional Modeling of Various Soil Features Based on the tij ConceptIntroduction Three-dimensional modeling of overconsolidated soils—advanced elastoplastic modeling at stage IThree-dimensional modeling of structured soils—advanced elastoplastic modeling at stage IIThree-dimensional modeling of other features of soils—advanced elastoplastic modeling at stage III Conclusions of Part 1 PART 2: NUMERICAL AND PHYSICAL MODELING OF GEOTECHNICAL PROBLEMSIntroduction to Numerical and Physical ModelingIntroductionModeling the interface behavior between soil and structure Geomaterials used in 2D and 3D model tests and their material parameters TunnelingTwo-dimensional trapdoor problemsThree-dimensional trapdoor problemsCircular tunneling Earth Pressure of Retaining Walls and Bearing Capacity of FoundationsActive and passive earth pressure behind retaining wallsBraced open excavationStrip foundation and piled raft foundation Reinforced SoilsReinforced foundation under uplift loadingReinforcing for increasing bearing capacity Localization and Shear Band Development in Element TestsIntroduction Outline of analyses Results and discussion Conclusions of Part 2 References Index

Teruo Nakai is a professor at the Nagoya Institute of Technology. He has received several honors, including Best Research Paper Awards from the Japanese Geotechnical Society. He earned a Ph.D. from Kyoto University. His research interests include the testing of geomaterials and their constitutive modeling in general stress systems as well as the application of constitutive models to boundary value problems, such as tunneling, braced excavation, bearing capacity of various foundations, and reinforced soils.