Soil is a matter of its own right. Nevertheless the properties should be modeled as accurate and reliable as possible. Geoscientists and geotechnical engineers need to rely on models while describing the properties of soil for engineering purposes. Gerd Gudehus follows accepted principles of natural philosophy and engineering. Soils are complex matter with respect to composition, state an behaviour. This part of complexity can be mastered by means of state limits and limit cycles. Graphical representation helps to lighten the constitutive relations. The author presents constitutive concepts of elastoplasticity and hypoplasticity. The first part of the 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. It is a powerful tool which will be useful for the description of soils and their properties. Although validated in many cases, the search for improvements will still go on.
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