Static liquefaction as a form of material instability in element test simulations of granular soil

• Autorzy: Sternik Krzysztof

Identyfikatory

DOI

10.24425/ace.2024.149865

Warianty tytułu

PL

Statyczne upłynnienie jako forma niestabilności materiału w symulacjach testów elementowych gruntu niespoistego

• Języki publikacji: EN

Abstrakty

EN

Static liquefaction is a form of unstable behaviour of granular soil. It is most common in saturated loose sands under monotonically loaded undrained conditions. Predicting static liquefaction using an elastic-plastic model that incorporates the non-associated plastic flow rule and strain hardening is possible. The article briefly describes the unstable behaviour of saturated sand in undrained conditions under a monotonic load. A simple elastic-plastic model with deviatoric hardening and a Drucker-Prager load surface is presented. The constitutive relationships were programmed in a Python script. Simulations of triaxial tests under mixed stress-strain control demonstrated the model’s ability to predict various undrained sand responses, including fully stable responses (no liquefaction) and partial and complete liquefaction under triaxial compression and tension. Predicting static liquefaction is possible by properly selecting the proportions of the parameters involved in plastic potential and loading functions and the parameter A used in the deviatoric hardening rule of hyperbolic type.

PL

Statyczne upłynnienie jest formą niestabilnego zachowania się gruntu niespoistego. Najczęściej występuje w nasyconych piaskach luźnych w warunkach bez odpływu wody obciążonych monotonicznie. Możliwe jest prognozowanie statycznego upłynnienia przy użyciu sprężysto-plastycznego modelu, w którym uwzględnia się niestowarzyszone prawo płynięcia plastycznego i wzmocnienie odkształceniowe. W pracy przedstawiono krótki opis niestabilnego zachowania się piasku nasyconego w warunkach bez odpływu pod obciążeniem monotonicznym. Zaprezentowano prosty model sprężysto-plastyczny ze wzmocnieniem dewiatorowym i powierzchnią obciążenia Druckera-Pragera. Związki konstytutywne zaprogramowane zostały w skrypcie Python. Symulacje testów trójosiowego ściskania i rozciągania i mieszanej kontroli naprężeniowo-odkształceniowej pokazały zdolność modelu do prognozy różnych reakcji piasku w warunkach bez odpływu, w tym braku upłynnienia, częściowego i pełnego upłynnienia.

• Wydawca: Komitet Inżynierii Lądowej i Wodnej PAN ; Politechnika Warszawska, Wydział Inżynierii Lądowej
• Czasopismo: Archives of Civil Engineering
• Rocznik: 2024
• Tom: Vol. 70, nr 2
• Strony: 309--322
• Opis fizyczny: Bibliogr. 33 poz., il.

Twórcy

autor

Sternik Krzysztof

• Silesian University of Technology, Faculty of Civil Engineering, Gliwice, Poland

• https://orcid.org/0000-0002-8354-6724

Bibliografia

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