Geomechanics and Engineering

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Evaluation of long term shaft resistance of the reused driven pile in clay

  • Cui, Jifei (Department of Civil Engineering, University of Shanghai for Science and Technology) ;
  • Rao, Pingping (Department of Civil Engineering, University of Shanghai for Science and Technology) ;
  • Wu, Jian (Department of Civil Engineering, University of Shanghai for Science and Technology) ;
  • Yang, Zhenkun (Department of Civil Engineering, University of Shanghai for Science and Technology)
  • Received : 2021.10.22
  • Accepted : 2022.03.08
  • Published : 2022.04.25
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Abstract

Reusing the used pile has not yet been implemented due to the unpredictability of the bearing capacity evolution. This paper presents an analytic approach to estimate the sides shear setup after the dissipation of pore pressure. Long-term evolution of adjacent soil is simulated by viscoelastic-plastic constitutive model. Then, an innovative concept of quasi-overconsolidation is proposed to estimate the strength changes of surrounding soil. Total stress method (α method) is employed to evaluate the long term bearing capacity. Measured data of test piles in Louisiana and semi-logarithmic time function are cited to validate the effectiveness of the presented method. Comparisons illustrate that the presented approach gives a reasonably prediction of the side shear setup. Both the presented method and experiment show the shaft resistance increase by 30%-50%, and this highlight the potential benefit of piles reutilization.

Keywords

Acknowledgement

The research work presented here was supported by the National Natural Science Foundation of China (Grant 52108328) and Soft Science Project of Shanghai Science and Technology Innovation Plan (Grant 22692193700). The financial supports are greatly appreciated.

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