SEEPAGE AND INERTIA EFFECT ON RATE-DEPENDENT REACTION OF A PILE IN LIQUEFIED SOIL

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Author(s)

Abstract

The seepage and inertia effects on the rate-dependent subgrade reaction of a single pile in liquefied soil are clarified through numerical studies. The quasi-static (for seepage effect) and dynamic (for inertia effect) numerical analyses are performed with a soil-water coupled formulation and a simplified cyclic elasto-plastic constitutive model for liquefied sand. The constitutive model can explicitly deal with the liquefaction intensity by changing the lower bounds of the mean effective stress. The liquefied soil at a certain depth around a pile is modeled with finite elements under a plane stress condition. The results of the quasi-static analyses under monotonic loading conditions show that the apparent rate-dependency of the subgrade reaction is caused by the seepage of pore water around the pile due to soil positive dilatancy under large strain range. The results of the dynamic analyses under cyclic loading conditions show that the positive correlation in a <i>p</i>-<i>v</i> (subgrade reaction-pile relative velocity) relation can be explained with the phase difference in movement between a pile and the neighboring soil around the pile due to inertia under small strain range.<br>

Journal

  • SOILS AND FOUNDATIONS

    SOILS AND FOUNDATIONS 48(1), 15-25, 2008

    The Japanese Geotechnical Society

Cited by:  1

Codes

  • NII Article ID (NAID)
    110007327326
  • NII NACSIS-CAT ID (NCID)
    AA00700879
  • Text Lang
    ENG
  • Article Type
    Journal Article
  • ISSN
    0038-0806
  • Data Source
    CJPref  NII-ELS  J-STAGE  NDL-Digital 
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