Die Ermittlung der Überkonsolidation und deren Berücksichtigung bei FE-Berechnungen am Beispiel des fein-körnigen Münchener Tertiärs

As the experiences show, the stress-deformation-behaviour of the soil cannot be illustrated realistically by basic material models, for example as a linear elastic, ideally plastic material model. Moreover higher grade material models were developed in the latest past, as for example elasto-plastic material models with hardening. Beside the standard material parameters this kind of material models require additional initial parameters as for the description of nonlinear stress-strain-relations during oedometric and deviatoric primary loading as well as reloading and the coefficient of earth pressure at rest K ₀ as a function of the overcon-solidation ratio OCR. In literature there is only a small number of details and experiences regarding to such input parameters for practical use. In this publication several experimental techniques are described and evaluated. Furthermore the results of extensive laboratory and field tests are represented and evaluated regarding to the variation and comparability by the example of fine-grained tertiary soils in Munich. Among other things an empirical formulation was derived, with which the coefficient of earth pressure at rest K ₀ can be determined for primary loading as well as un-and reloading.