Numerical analysis and centrifuge modeling of shallow foundations

Qiang Luo, Mao tian Luan, Yun ming Yang, Zhong tao Wang, Shou zheng Zhao

Research output: Journal PublicationArticlepeer-review

1 Citation (Scopus)

Abstract

The influence of non-coaxial constitutive model on predictions of dense sand behavior is investigated in this paper. The non-coaxial model with strain softening plasticity is applied into finite-element program ABAQUS, which is first used to predict the stress-strain behavior and the non-coaxial characteristic between the orientations of the principal stress and principal plastic strain rate in simple shear tests. The model is also used to predict load settlement responses and bearing capacity factors of shallow foundations. A series of centrifuge tests for shallow foundations on saturated dense sand are performed under drained conditions and the test results are compared with the corresponding numerical results. Various footing dimensions, depths of embedment, and footing shapes are considered in these tests. In view of the load settlement relationships, the stiffness of the load-displacement curves is significantly affected by the non-coaxial model compared with those predicted by the coaxial model, and a lower value of non-coaxial modulus gives a softer response. Considering the soil behavior at failure, the coaxial model predictions of bearing capacity factors are more advanced than those of centrifuge test results and the non-coaxial model results; besides, the non-coaxial model gives better predictions. The non-coaxial model predictions are closer to those of the centrifuge results when a proper non-coaxial plastic modulus is chosen.

Original languageEnglish
Pages (from-to)163-180
Number of pages18
JournalChina Ocean Engineering
Volume28
Issue number2
DOIs
Publication statusPublished - 27 Apr 2014
Externally publishedYes

Keywords

  • FEM analysis
  • centrifuge test
  • non-coaxial model
  • shallow foundation
  • strain softening

ASJC Scopus subject areas

  • Oceanography
  • Renewable Energy, Sustainability and the Environment
  • Ocean Engineering
  • Mechanical Engineering

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