DEVELOPMENT OF AN ANALYSIS FOR CYCLIC AXIAL LOADING OF PILES

The paper describes an economical method of analyzing the effects of cyclic loading on the ultimate axial load capacity and load-settlement (stiffness) response of a single pile. The effects of cyclic loading are allowed for by determining the excess pore pressures generated along the pile by the cyclic loading, and using an effective stress approach to estimate the influence of these excess pore pressures on soil modulus, pile-soil skin friction and pile base resistance. A series of theoretical solutions indicates that for piles in normally-consolidated clays, a maximum of 25-30 percent reduction in ultimate load capacity and pile stiffness may occur because of prior cyclic loading. However, in overconsolidated clays, significantly larger reductions in load capacity and pile stiffness may occur. Another interesting consequence of the analysis is that the ultimate load capacity after cycling is dependent on the compressibility of the pile relative to the soil. Comparisons between the theory and a preliminary series of model test results show fair agreement, but suggest that improvements to the analysis may be necessary, particularly in relation to the rate of excess pore pressure generation and the consideration of dissipation of these excess pore pressures during the cycling period (A). (TRRL)

  • Corporate Authors:

    University of Sydney

    School of Civil Engineering, Parramatta Road
    Sydney, New South Wales  Australia  2006
  • Authors:
    • POULOS, H G
  • Publication Date: 1979-5

Media Info

  • Features: Figures; References; Tables;
  • Pagination: 50 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00309811
  • Record Type: Publication
  • Source Agency: ARRB Group Ltd.
  • Report/Paper Numbers: Research Report R347Monograph
  • Files: ITRD, TRIS, ATRI
  • Created Date: Jun 26 1980 12:00AM