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Theoretical study on setup of expanded-base pile considering cavity contraction

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Abstract

When an expanded-base pile is installed into ground, the cavity expansion associated with penetration of the enlarged pile base is followed by cavity contraction along the smaller-diameter pile shaft. In order to account for the influence of cavity contraction on the change of bearing capacity of expanded-base pile, a theoretical calculation methodology, predicting the setup of expanded-base pile, was established by employing the cavity contraction theory to estimate the shaft resistance of expanded-base pile, and horizontal consolidation theory to predict the dissipation of excess pore pressure. Finally, the numerical solutions for the setup of expanded-base pile were obtained. The parametric study about the influence of cavity contraction on setup of expanded-base pile was carried out, while a field test was introduced. The parametric study shows that the decrements in radial pressure and the maximum pore water pressure after considering cavity contraction are increased as the expanded ratio (base diameter/shaft diameter) and rigidity index of soil are raised. The comparison between calculated and measured values shows that the calculated results of ultimate bearing capacity for expanded-base pile considering cavity contraction agree well with the measured values; however, the computations ignoring cavity contraction are 2.5-3.0 times the measured values.

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Authors and Affiliations

  1. Faculty of Architectural, Civil Engineering and Environment, Ningbo University, Ningbo, 315211, China

    Chang-guang Qi  (齐昌广), Gan-bin Liu  (刘干斌), Yan Wang  (王艳) & Yue-bao Deng  (邓岳保)

Authors
  1. Chang-guang Qi  (齐昌广)
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  2. Gan-bin Liu  (刘干斌)
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  3. Yan Wang  (王艳)
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  4. Yue-bao Deng  (邓岳保)
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Corresponding author

Correspondence to Chang-guang Qi  (齐昌广).

Additional information

Foundation item: Project(LQ15E080002) supported by Zhejiang Provincial Natural Science Foundation of China; Projects(51508282, 51478228) supported by the National Natural Science Foundation of China

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Qi, Cg., Liu, Gb., Wang, Y. et al. Theoretical study on setup of expanded-base pile considering cavity contraction. J. Cent. South Univ. 22, 4355–4365 (2015). https://doi.org/10.1007/s11771-015-2984-x

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  • DOI: https://doi.org/10.1007/s11771-015-2984-x

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