Some Observations on Undrained Side Resistance of Drilled Shaftsby Fred H. Kulhawy, Cornell Univ, United States,
Christina Stas Jackson, Cornell Univ, United States,
Abstract: A data base of 106 field load tests (65 in uplift and 41 in compression) is used to evaluate the undrained side resistance of drilled shaft foundations. The total stress or alpha (α) method is examined first, and a new α correlation is presented specifically for drilled shafts. The data show no significant difference in α for either uplift or compression loading. On the average, this new correlation should result in a slightly conservative prediction. Secondly, the effective stress or beta (β) method is examined for undrained loading. Back-calculated β values very dramatically with depth and strongly suggest the importance of evaluating stress history carefully and thoroughly, especially for shorter drilled shafts.
Subject Headings: Shafts | Drilled shafts | Uplifting behavior | Load and resistance factor design | Field tests | Load tests | Compression
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