Determination of Pile Base Resistance in Sands

R. Salgado

Assoc. Prof., School of Civil Engineering, Purdue University, West Lafayette, IN

J. H. Lee

PhD Candidate, School of Civil Engineering, Purdue University, West Lafayette, IN

This paper is part of the Journal of Geotechnical and Geoenvironmental Engineering, Vol. 125, No. 8, August, 1999. ©ASCE, ISSN 1090-0241/99/0008-0673–0683.

Pile design methods using in situ test results have been mainly based on the standard penetration test (SPT) and the cone penetration test (CPT) (Bandini and Salgado 1998). The CPT resembles the vertical loading process in a pile; thus, it is regarded as one of the most effective tools available for pile design. In the present study, to take advantage of the CPT for pile design, load-settlement curves in terms of normalized base resistance q_b/q_c versus relative settlement s/B were developed. Although the limit state design concept for pile design has been used mostly with respect to either s/B = 5% or s/B = 10%, the normalized load-settlement curves obtained in this study allow determination of pile base resistance at any relative settlement level within the 0–20% range. The determination of base resistance is a key element in pile design because the side resistance of piles is in most cases fully mobilized well before the maximum base resistance is reached.

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