Modulus of elasticity in deep bored piles

Joram M. Amir, Erez I. Amir, Carlos Lam

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    The modulus of elasticity of pile material (E) is an important parameter for the interpretation of both static and dynamic loading tests on piles. This value is commonly assumed to be constant with depth though it may not be true for deep bored piles due to the chosen casting method and/or self-weight consolidation. To provide evidence to support this proposition, the results of compressive strength tests on core samples taken from four different studies have been presented. The results show a marked increase in the strength and stiffness values with depth. The results of crosshole ultrasonic tests conducted at another site also confirm the same pattern. It is therefore recommended that before load testing a pile the distribution of the E values along the pile axis should be investigated. This will ensure the use of a realistic elastic modulus value and hence the correct interpretation of the distribution between the shaft and end resistances.
    Original languageEnglish
    Title of host publicationhost publication
    Place of PublicationHawthorne, New Jersey, USA
    PublisherDeep Foundations Institute
    Number of pages6
    Publication statusPublished - 2014
    EventDFI/EFFC International Conference on Piling and Deep Foundations - Stockholm, Sweden
    Duration: 21 May 201423 May 2014


    ConferenceDFI/EFFC International Conference on Piling and Deep Foundations
    CityStockholm, Sweden
    Internet address


    • bored pile
    • drilled shaft
    • Young's modulus


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