NUMERICAL DESIGN-ANALYSIS FOR PILES IN SANDS

A few points are made with regard to the numerical analysis of piles. It is difficult to depend upon laboratory stress- strain curves for stiff clays for determination of initial mouduls and the ultimate strength. Also, the load- deformation behavior is highly dependent on the magnitudes of adhesion at interface, cohesive strength, factor alpha, and spatial distribution of E. It is noted that for driven piles driving stresses can influence the distribution significantly, and for homogeneous soils, the numerical procedure seems to be incapable of predicting the double curvature in the distribution of load in pile observed in many field conditions. In stiff clay, the phenomenon of softening in the soil and at the interface needs to be considered if realistic computations for behavior at greater loads are desired. It is possible to include softening in finite element analysis, and these results can allow better correlation with observations than those without incorporation of softening. Analyses have shown that the effect of installation for driven piles is restricted approximately within a zone of four times the diameter of the pile.

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  • Accession Number: 00134050
  • Record Type: Publication
  • Report/Paper Numbers: ASCE #11893
  • Files: TRIS
  • Created Date: Jun 23 1976 12:00AM