Multiphysics extension to physically based analyses of pipes with emphasis on frost actions

Zhen Liu, Xiong Yu, Jun Liang Tao, Ye Sun

Research output: Contribution to journalArticle

5 Scopus citations

Abstract

Pipes, especially buried pipes, in cold regions generally experience a rash of failures during cold weather snaps. However, the existing heuristic models are unable to explain the basic processes involving frost actions. This is because the frost action is not a direct load but one that causes variations in pipe-soil interactions resulting from the coupled thermohydro- mechanical process in soils. This paper developed and implemented a holistic multiphysics simulation model for freezing soils and extended it to the analysis of pipe-soil systems. The theoretical framework was implemented to analyze both static and dynamic responses of buried pipes subjected to frost actions. The multiphysics simulations reproduced phenomena commonly observed during frost actions, e.g., ice fringe advancement and an increase in the internal stress of pipes. The influences of important design factors, i.e., buried depth and overburden pressure, on pipe responses were simulated. A fatigue cracking criterion was utilized to predict the crack initialization under the joint effects of frost and dynamic traffic loads. The frost effects were found to have detrimental effects for accelerating fatigue crack initialization in pipes.

Original languageEnglish (US)
Pages (from-to)877-887
Number of pages11
JournalJournal of Zhejiang University: Science A
Volume13
Issue number11
DOIs
StatePublished - Nov 1 2012
Externally publishedYes

Keywords

  • Finite element method (FEM)
  • Frost action
  • Multiphysics
  • Underground pipe

ASJC Scopus subject areas

  • Engineering(all)

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