Structure and Calibration of Constitutive Equations for Granular Soils
| Autor: | Sawicki Andrzej, Sławińska Justyna, Mierczyński Jacek |
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| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: | |
| Zdroj: | Studia Geotechnica et Mechanica, Vol 36, Iss 4, Pp 35-46 (2015) |
| Druh dokumentu: | article |
| ISSN: | 0137-6365 2083-831X |
| DOI: | 10.2478/sgem-2014-0034 |
| Popis: | The form of incremental constitutive equations for granular soils is discussed for the triaxial configuration. The classical elasto-plastic approach and the semi-empirical model are discussed on the basis of constitutive relations determined directly from experimental data. First, the general structure of elasto-plastic constitutive equations is presented. Then, the structure of semiempirical constitutive equations is described, and a method of calibrating the model is presented. This calibration method is based on a single experiment, performed in the triaxial apparatus, which also involves a partial verification of the model, on an atypical stress path. The model is shown to give reasonable predictions. An important feature of the semi-empirical incremental model is the definition of loading and unloading, which is different from that assumed in elasto-plasticity. This definition distinguishes between spherical and deviatoric loading/unloading. The definition of deviatoric loading/unloading has been subject to some criticism. It was therefore discussed and clarified in this paper on the basis of the experiment presented. |
| Databáze: | Directory of Open Access Journals |
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