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Author(s):	Becker, P.; Kempfert, H.
Title:
Abstract:	Es werden die wesentlichen Ergebnisse zur Untersuchung der Baugrubenverformungen in weichen Böden bei spanungspfadabhängigem Materialverhalten anhand von 1g-Modellversuchen, Elementversuchen, numerischen Berechnungen sowie Validierungen an drei Fallbeispielen vorgestellt. Wesentliche neue wissenschaftliche Erkenntnisse resultieren insbesondere aus spannungspfadabhängigen Triaxialversuchen. Die bodenmechanischen Kenngrößen sind danach eindeutig spannungspfadabhängig. Darüber hinaus wird eine verbesserte, unmittelbar in der Ingenieurpraxis anwendbare Vorgehensweise zur Berücksichtigung der spannungspfadabhängigen Steifigkeit vorgestellt, die für zukünftige Projekte bei vergleichbaren Randbedingungen besser abgesicherte Prognosen der Beanspruchungen und besonders der zu erwartenden Verformungen ermöglichen. Deformations of excavations in soft soils with stress-path-dependent material behavior. The substantial results of a research work on deformations of excavations in soft grounds with stress path dependent material behavior on the basis of 1g-model tests, element tests, numerical analysis as well as validations of three practical case studies are presented. The investigations revealed a pronounced dependency of the stiffness on the stress paths. Therefore, a new approach for numerical analyses is introduced which allows a consideration of the stress path dependent stiffness according to the characteristic stress path zones. Taking into account both temporal and spatial effects in the construction of the three case studies, a good agreement is reached further between the measurements and numeriod results. Thus, the new approach contributes to the optimization of the analysis of excavations in soft soils.
Source:	Bautechnik 87 (2010), No. 10
Page/s:	593-603
Language of Publication:	German

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