Behavior of large-diameter rock-socketed piles under lateral loads

J.-J. Chen, J.-H. Wang, X. Ke, D.-S. Jeng

    Research output: Contribution to journalArticle

    4 Citations (Scopus)

    Abstract

    Large-diameter rock-socketed piles have been extensively used as the foundation of platforms and other offshore installations. In this paper, the behavior of large-diameter rock-socketed CFST (concrete-filled steel tube) piles under lateral loads is studied, based on field tests and numerical analysis. The CFST piles are 2800 mm in diameter and 40 m in length, with 5.2 m socketed into the rock. The horizontal capacity and deformation of large-diameter rock-socketed piles are analyzed from the measured displacements and internal forces of piles. The interactive behavior of pile-rock and the influence of backfilled sand on horizontal capacity are also discussed. Using the Finite Element Method (FEM) considering the properties of the pile-soil interface, the test results are simulated numerically. This shows that the stress concentration effect in the region near the bottom of the steel tube should be considered in the design, because the socketed part of piles bears most of the lateral load. The steel tube and backfilled sand are both effective in limiting the pile displacement under the working load. Parametric analysis shows there is an optional socketed length to improve the bearing capacity of piles.
    Original languageEnglish
    Pages (from-to)323-329
    Number of pages7
    JournalInternational Journal of Offshore and Polar Engineering
    Volume21
    Issue number4
    Publication statusPublished - 2011

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    Piles
    Rocks
    Steel
    Sand
    Concretes
    Bearing capacity
    Stress concentration
    Numerical analysis
    Soils
    Finite element method

    Cite this

    Chen, J.-J. ; Wang, J.-H. ; Ke, X. ; Jeng, D.-S. / Behavior of large-diameter rock-socketed piles under lateral loads. In: International Journal of Offshore and Polar Engineering. 2011 ; Vol. 21, No. 4. pp. 323-329.
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    abstract = "Large-diameter rock-socketed piles have been extensively used as the foundation of platforms and other offshore installations. In this paper, the behavior of large-diameter rock-socketed CFST (concrete-filled steel tube) piles under lateral loads is studied, based on field tests and numerical analysis. The CFST piles are 2800 mm in diameter and 40 m in length, with 5.2 m socketed into the rock. The horizontal capacity and deformation of large-diameter rock-socketed piles are analyzed from the measured displacements and internal forces of piles. The interactive behavior of pile-rock and the influence of backfilled sand on horizontal capacity are also discussed. Using the Finite Element Method (FEM) considering the properties of the pile-soil interface, the test results are simulated numerically. This shows that the stress concentration effect in the region near the bottom of the steel tube should be considered in the design, because the socketed part of piles bears most of the lateral load. The steel tube and backfilled sand are both effective in limiting the pile displacement under the working load. Parametric analysis shows there is an optional socketed length to improve the bearing capacity of piles.",
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    Behavior of large-diameter rock-socketed piles under lateral loads. / Chen, J.-J.; Wang, J.-H.; Ke, X.; Jeng, D.-S.

    In: International Journal of Offshore and Polar Engineering, Vol. 21, No. 4, 2011, p. 323-329.

    Research output: Contribution to journalArticle

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    AU - Chen, J.-J.

    AU - Wang, J.-H.

    AU - Ke, X.

    AU - Jeng, D.-S.

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    PY - 2011

    Y1 - 2011

    N2 - Large-diameter rock-socketed piles have been extensively used as the foundation of platforms and other offshore installations. In this paper, the behavior of large-diameter rock-socketed CFST (concrete-filled steel tube) piles under lateral loads is studied, based on field tests and numerical analysis. The CFST piles are 2800 mm in diameter and 40 m in length, with 5.2 m socketed into the rock. The horizontal capacity and deformation of large-diameter rock-socketed piles are analyzed from the measured displacements and internal forces of piles. The interactive behavior of pile-rock and the influence of backfilled sand on horizontal capacity are also discussed. Using the Finite Element Method (FEM) considering the properties of the pile-soil interface, the test results are simulated numerically. This shows that the stress concentration effect in the region near the bottom of the steel tube should be considered in the design, because the socketed part of piles bears most of the lateral load. The steel tube and backfilled sand are both effective in limiting the pile displacement under the working load. Parametric analysis shows there is an optional socketed length to improve the bearing capacity of piles.

    AB - Large-diameter rock-socketed piles have been extensively used as the foundation of platforms and other offshore installations. In this paper, the behavior of large-diameter rock-socketed CFST (concrete-filled steel tube) piles under lateral loads is studied, based on field tests and numerical analysis. The CFST piles are 2800 mm in diameter and 40 m in length, with 5.2 m socketed into the rock. The horizontal capacity and deformation of large-diameter rock-socketed piles are analyzed from the measured displacements and internal forces of piles. The interactive behavior of pile-rock and the influence of backfilled sand on horizontal capacity are also discussed. Using the Finite Element Method (FEM) considering the properties of the pile-soil interface, the test results are simulated numerically. This shows that the stress concentration effect in the region near the bottom of the steel tube should be considered in the design, because the socketed part of piles bears most of the lateral load. The steel tube and backfilled sand are both effective in limiting the pile displacement under the working load. Parametric analysis shows there is an optional socketed length to improve the bearing capacity of piles.

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