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Soil is matter in its own right. Its nature can be captured by means of monotonous, cyclic and strange attractors. Thus material properties are defined by the asymptotic response of sand- and clay-like samples to imposed deformations and stresses. This serves to validate and calibrate elastoplastic and hypoplastic relations with comparative plots. Extensions capture thermal and seismic activations, limitations occur due to localizations and skeleton decay.Attractors in the large characterize boundary value problems from model tests via geotechnical operations up to tectonic evolutions. Validations of hypoplastic calculations are shown with many examples, possible further applications are indicated in detail. This approach is energetically justified and limited by critical points where the otherwise legitimate continuity gets lost by localization and decay. You will be fascinated by the fourth element although or just as it is so manifold.
Sommario
Prologue.- introduction.- simple psammoids.- simple peloids.- psammoids with reversals.- peloids with reversals.- pore fluid.- bridging gaps.- localization.- fabric.- boundary conditions.- one-dimensional evolutions.- plane-parallel evolutions without ssi.- plane-parallel evolutions with ssi.- axi-symmetric evolutions.- less symmetric evolutions.- critical phenomena.- epilogue.- references.- symbols and acronyms.
Info autore
Gerd Gudehus studied civil engineering in Berlin, where he also completed his doctoral thesis in soil mechanics. In 1973, he became full professor and chairman of the Department of Soil Mechanics and Foundation Engineering at the Institute of Soil and Rock Mechanics, Karlsruhe University. He is head of the Soil Mechanics Section of the German National Geotechnical Society and is engaged in the conservation and restoration of historical retaining walls and in the stabilization of the foundations of historical buildings situated on soft ground.
Riassunto
Soil is a matter of its own right, whose properties should be modeled as accurately and reliably as possible. Geoscientists and geotechnical engineers rely on models to describe the properties of soil for engineering purposes. Soils are complex in composition, state and behaviour. This complexity can be mastered using state limits and limit cycles. The author presents constitutive concepts of elastoplasticity and hypoplasticity. The first part of this book deals with constitutive relations. For sand-like soils (psammoids), state limits are introduced, described as attractors, constitutive relations represented by means of related strain and state paths, validated by means of oedeometer, triaxial, cuboidal, simple shear and torsion shear results. The second part deals with boundary value problems for soils which are no more homogeneous with respect to state and composition. The concept of related evolutions of state and shape works throughout more complex boundary value problems.
