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Since my first acquaintance I was fascinated by the mechanical behaviour of soil and felt the challenge to find an adequate mathematical model to describe it. In doing so I was repelled by the complexity of the theory of plasticity which I felt is inappropriate (i.e. too complicated) to describe soil. I was much more attracted by Rational Mechanics (as stated in the Encyclopedia of Physics article „The Non-Linear Filed Theories of Mechanics“) by Truesdell and Noll. In particular, I was challenged by Nolls idea to express a constitutive law as an evolution equation of the type dT/dt=h(T,D). Instead, the theory of plasticity (which still dominates Soil Mechanics) attempts to manage tensorial relations by introducing scalar functions (surfaces) in the stress space. This may allow impressive simulations but the price is a repelling complexity, that renders constitutive modelling unalluring. As I stated in my article „The misery of constitutive modelling“, this field is still characterised by limited interest and inhibited (due to its complexity) communication. In my new book „A Primer on Theoretical Soil Mechanics“ I show how the mechanical behaviour of soil can be explained by mere reasoning and I also show that a powerful constitutive model, barodesy, can be derived by considering that dry granulates cannot sustain tensile stresses and exhibit fading memory. Admittedly, my first simulations with barodesy did not yield very convincing simulations, until I recently introduced a more general concept of critical density. This allows to introduce unique mathematical formulations for sand and clay. Barodesy is a young frame and many person-years have still to be (hopefully) spent towards calibration and numerical implementation.
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Born 1949 in Athens I studied Civil Engineering in Karlsruhe obtaining 1972 my degree. 1972-1994 I worked in the Institut für Bodenmechanik und Felsmechanik of the Karlsruhe University. 1994-2018 I was professor of Geotechnical and Tunnel Engineering at the University of Innsbruck. Next to several other contributions, my principal scientific aim was to develop constitutive laws for soil along the principles of Rational Mechanics. In 1977 I published the first version of hypoplasticity. In recent years I introduced "barodesy", a frame for constitutive modelling that can be derived from the principle of fading memory. Barodesy offers unique models for sand and clay and requires a more general definition of critical density.

A Primer on Theoretical Soil Mechanics, Cambridge University Press, 2022 Kolymbas, D. (2008): Tunnelling and Tunnel Mechanics. A Rational Approach to Tunnellling. Dordrecht - Heidelberg - London - New York - Berlin: Springer. ISBN 978-3-540-25196-5. 2. edition. Kolymbas, Dimitrios (2019): Geotechnik - Bodenmechanik, Grundbau und Tunnelbau,. Berlin: Springer Vieweg. ISBN 978-3-662-58471-2. 5. edtion. Kolymbas, D.; Viggiani, G., ed. (2009): Mechanics of Natural Solids. Dordrecht - Heidelberg - London - New York - Berlin: Springer. ISBN 978-3-642-03577-7. Kolymbas, Dimitrios; Medicus, Gertraud (2016): Genealogy of hypoplasticity and barodesy. In: International Journal for Numerical and Analytical Methods in Geomechanics 40/18, pp. 3532 - 2550. Kolymbas, D.: Nicht alles, was zählt, kann gezählt werden. In: Neue Zürcher Zeitung of 2010-08-07. A rate-dependent constitutive equation for soils. Mech. Res. Comm., 4, 367-372, 1977 Bifurcation analysis for sand samples with a non-linear constitutive equation. Ingenieur-Archiv, 50, 131-140, 1981 Computer-aided design of constitutive laws. International Journal for Numerical and Analytical Methods in Geomechanics, 15, pp. 593-604 (1991) Kolymbas D. (ed.): Modern Approaches to Plasticity, Elsevier, Amsterdam, 1993 Behaviour of liquefied sand. Phil. Trans. R. Soc. Lond. A., 356 , 1-14, 1998. The misery of constitutive modelling. In: D. KOLYMBAS (ed.) "Constitutive Modelling of Granular Materials" Springer, 2000, 11-24

Joined 4.10.2017

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