State of the art in modeling of soil behaviour at small strains

• Autorzy: Gryczmański M.
• Języki publikacji: EN

Abstrakty

EN

The present paper is an attempt at a comprehensive overview of studies on behaviour of overconsolidated soils at small strains. The text has been divided into six sections related to different aspects of the addressed issues. The first section provides an introduction. The subject of the second section is the phenomenon of abrupt drop of the tangent shear and bulk moduli when increasing corresponding strain invariants in the ranges of their small values. Special attention is paid to evaluating the maximum values of moduli which are constant in a region of very small strains. The third section concerns the nature of the above mentioned material properties. The results of the discussed Jardine’s experiments indicate that there exist four regions of different soil behaviour around a stable stress point within the admissible state space.The fourth section focuses on simple hypoelastic laws for soils describing steep decreasing tangent shear and bulk moduli at small to moderate strains. The fifth section presents advanced kinematic hardening elasto-plasticmodels which take into account, in different ways, strong stressstrain nonlinearity at small deformations. Two models are described in more detail. The first of them is the one surface model of the cryptonym NAHOS 1 and the other is the three surface SH3 one. The conclusion inserted in the latter sixth section discusses briefly beneficial outcomes of accounting for small strain nonlinearity phenomenon.

PL

Artykuł niniejszy jest próbą obszernego przeglądu badań nad zachowaniem się prekonsolidowanych gruntów przy małych odkształceniach. Tekst podzielony został na sześć rozdziałów związanych z różnymi aspektami przedmiotowej problematyki. Rozdział pierwszy stanowi wprowadzenie. Przedmiotem drugiego rozdziału jest zjawisko gwałtownego spadku stycznych modułów ścinania i ściśliwości ze wzrostem korespondujących niezmienników odkształcenia w zakresach ich małych wartości. Specjalna uwaga zwrócona jest na szacowanie maksymalnych wartości modułów, które są stałe w przedziale bardzo małych odkształceń. Rozdział trzeci dotyczy natury wspomnianych zjawisk. Wyniki omawianych eksperymentów Jardine’a wskazują na istnienie, wokół ustalonego punktu naprężenia wewnątrz dozwolonej przestrzeni stanu, czterech obszarów różnego zachowania się gruntu. Rozdział czwarty skupiony jest na prostych prawach hiposprężystych dla gruntów, opisujących stromy spadek stycznych modułów ścinania i ściśliwości w przedziale od małych do umiarkowanych odkształceń. Piąty rozdział przedstawia zaawansowane modele sprężysto-plastyczne o wzmocnieniu kinematycznym, które biorą pod uwagę, w różny sposób, silną nieliniowość związków „naprężenie-odkształcenie” w zakresie małych odkształceń. Dwa z nich opisane są bardziej szczegółowo. Pierwszy z nich, jest jednopowierzchniowym modelem o nazwie NAHOS 1 a drugi trójpowierzchniowym modelem SH3. Podsumowanie zamieszczone w ostatnim szóstym rozdziale omawia pokrótce korzyści wynikające z uwzględnienia zjawiska silnej nieliniowości w zakresie małych odkształceń.

Słowa kluczowe

EN

soil; strain; jardine's experiment

PL

grunt; odkształcenia; eksperyment Jardine'a

• Wydawca: Silesian University of Technology
• Czasopismo: Architecture Civil Engineering Environment
• Rocznik: 2009
• Tom: Vol. 2, no. 1
• Strony: 61--80
• Opis fizyczny: Bibliogr. 60 poz.

Twórcy

autor

Gryczmański M.

• Faculty of Civil Engineering, The Silesian University of Technology, Akademicka 5, 44-100 Gliwice, Poland,

Bibliografia

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