Now showing 1 - 2 of 2
  • Publication
    Axial resistance of CFA piles in Dublin boulder clay
    (Institution of Civil Engineers/Thomas Telford Publishing, 2008-08) ; ;
    This paper describes the results of static compression and tension load tests performed on three-instrumented large diameter Continuous Flight Auger piles installed in Dublin boulder clay. The piles developed very high shaft resistance and, in contrast to piles driven into boulder clay which exhibit friction fatigue, the shaft distribution was uniform along the pile shaft. This resulted in the normalised average shear resistance being mobilised by a bored pile exceeding that of a pile driven in similar ground conditions. In contrast the base resistance of the test piles were significantly lower than a pile driven in similar ground conditions.
      4860ScopusĀ© Citations 13
  • Publication
    The shaft capacity of CFA piles in sand
    (American Society of Civil Engineers, 2009-06) ; ;
    This paper presents the results of a series of field experiments performed to study the development of shaft resistance on Continuous Flight Auger piles installed in sand. The test piles were instrumented in order to separate the shaft and base resistance, and to allow the determination of the distribution of shaft resistance along the pile shaft. The tests highlighted the importance of accurate calculation of the shaft resistance for non-displacement piles. At a typical maximum allowable pile head settlement of 25 mm, more than 71 % of the pile resistance was provided by shaft friction. Conventional methods of estimating shaft resistance were assessed. It was found that methods which incorporated parameters directly interpreted from in-situ test results provided the most consistent estimates. In the final section, differences between the shaft resistances mobilised on displacement and non-displacement piles are considered.
      1716ScopusĀ© Citations 29