First-Order Estimation of Ko in Sands and Clays

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by Fred H. Kulhawy, Cornell Univ, United States,
Christina Stas Jackson, Cornell Univ, United States,
Paul W. Mayne, Cornell Univ, United States,

Document Type: Proceeding Paper

Part of: Foundation Engineering: Current Principles and Practices

Abstract: The in-situ horizontal stress coefficient (Ko) is known to be the dominant design parameter controlling the side resistance of deep foundations. Because of the relatively high cost of determining Ko in-situ, as well as the lack of appreciation of the importance of this parameter until relatively recently, many designers explicitly or implicitly use Konc corresponding to normally consolidated conditions. For deep foundations in overconsolidated soils, this assumption can be very conservative. This paper provides simple, first-order approximations for estimating the in-situ Ko of clays and sands.

Subject Headings: Penetration tests | Soil compression | Clays | Sandy soils | Soil stress | Load and resistance factor design | Deep foundations |

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