Constitutive models, or in short, soil models or rock models, are a theoretical framework for the relationship between stress and strain (and time) it is the qualitative description of the soil or rock behavior in the computer program. Geotechnical Finite Element (FE) programs, like PLAXIS 2D/3D Ultimate, use constitutive models to model the mechanical behavior of soil and rock layers. Other features are compaction and dilatancy, drained or undrained behavior (the latter involves a simultaneous change of pore water pressure), creep, anisotropy, structure, and several more. Stress-dependency and strain-dependency of stiffness and strength are some of the вЂfeatures of soil behaviorвЂ™. For example, soil strength and stiffness depend on the stress level, the loading direction, the strain level, short or long term, density, over-consolidation, and several more. Typical вЂengineering propertiesвЂ™ of soil, such as вЂstrengthвЂ™ and вЂstiffnessвЂ™ depend on many other properties and on the particular conditions that apply in the situation at hand. Features of Soil BehaviorД¬ompared to other вЂengineering materialsвЂ™ like steel and concrete, soil is a much more complex material. This blog explains why, and what are the better alternatives. If you are still addicted to Mohr-Coulomb, itвЂ™s time to move on. In this respect, a simplified model like the linear elastic perfectly plastic Mohr-Coulomb model can be regarded as inappropriate, since it lacks important features of real soil behavior. Numerical modellingВ of geotechnical applications requires appropriate soil models to obtain realistic and accurate results. Brinkgreve, and first presented by Virtuosity.

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