Numerical investigation on evolving failure of caisson foundation in sand using the combined Lagrangian-SPH method

Zhuang Jin, Zhen Yu Yin, Panagiotis Kotronis, Yin Fu Jin

Research output: Journal article publicationJournal articleAcademic researchpeer-review

10 Citations (Scopus)

Abstract

Caisson foundations are often used in offshore engineering. However, for an optimum design understanding the failure process of a caisson during its installation and the subsequent external loadings is crucial. This paper focuses on the evolving failure of a caisson foundation in sand by advanced numerical modeling. A combined Lagrangian-smoothed particle hydrodynamics method is adopted to deal with the large deformation analysis. The method with parameters are first calibrated and validated by a simulation of cone penetration test in sand. The results of an experimental campaign of a caisson in the same sand are selected and validated for the numerical model. Then, more representative loading combinations are designated for numerical modeling of failure process and mode. Furthermore, three additional caisson dimensions D/d = 0.5, 1.5, and 2.0 (changing the ratio of caisson diameter D to skirt length d while keeping the same soil-structure surface contact area) are simulated under six representative combined loading paths. Based on that, the influence of caisson dimension to the failure process and mode is investigated. All results are helpful to estimate all possible sliding surfaces under different monotonic combined loading paths for further limit analysis.

Original languageEnglish
Pages (from-to)23-35
Number of pages13
JournalMarine Georesources and Geotechnology
Volume37
Issue number1
DOIs
Publication statusPublished - 2 Jan 2019

Keywords

  • Caisson
  • failure mode
  • foundation
  • large deformation
  • sand
  • smoothed particle hydrodynamics

ASJC Scopus subject areas

  • Oceanography
  • Geotechnical Engineering and Engineering Geology
  • Ocean Engineering

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