Drilled Shaft Side Resistance in Clay Soil to Rock

by Fred H. Kulhawy, Cornell Univ, Ithaca, United States,
Kok-Kwang Phoon, Cornell Univ, Ithaca, United States,

Document Type: Proceeding Paper

Part of: Design and Performance of Deep Foundations: Piles and Piers in Soil and Soft Rock


An evaluation is made of available field load test data for the axial side clay soils to hard rocks. Conventional total stress interpretations by the alpha method are used to examine the variation in both average side resistance and alpha coefficient over more than three orders of magnitude of soil or rock strength. The results show that the soil and rock data behave largely as two separate populations, even though the functional relationships describing their behavior are similar in form. In general, the regression lines for the soil data provide a lower bound for the rock data. Recommendations are given on the use of these results in design.

Subject Headings: Clays | Field tests | Drilled shafts | Shafts | Load and resistance factor design | Rocks | Load tests | Soil strength

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