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Effect of sediment on vertical dynamic impedance of rock-socketed pile with large diameter

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Abstract

Based on the fictitious soil pile model, the effect of sediment on the vertical dynamic impedance of rock-socketed pile with large diameter was theoretically studied by means of Laplace transform technique and impedance function transfer method. Firstly, the sediment under rock-socketed pile was assumed to be fictitious soil pile with the same sectional area. The Rayleigh-Love rode model was used to simulate the rock-socketed pile and the fictitious soil pile with the consideration of the lateral inertial effect of large-diameter pile. The layered surrounding soils and bedrock were modeled by the plane strain model. Then, by virtue of the initial conditions and boundary conditions of the soil-pile system, the analytical solution of the vertical dynamic impedance at the head of rock-socketed pile was derived for the arbitrary excitation acting on the pile head. Lastly, based on the presented analytical solution, the effect of sediment properties, bedrock property and lateral inertial effect on the vertical dynamic impedance at rock-socketed pile head were investigated in detail. It is shown that the sediment properties have significant effect on the vertical dynamic impedance at the rock-socketed pile head. The ability of soil-pile system to resist dynamic vertical deformation is weakened with the increase of sediment thickness, but amplified with the increase of shear wave velocity of sediment. The ability of soil-pile system to resist dynamic vertical deformation is amplified with the bedrock property improving, but the ability of soil-pile system to resist vertical vibration is weakened with the improvement of bedrock property.

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Authors and Affiliations

  1. Geotechnical Engineering Institute, Huaqiao University, Xiamen, 361021, China

    Jin Yu  (俞缙) & Yan-yan Cai  (蔡燕燕)

  2. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, 430071, China

    Jin Yu  (俞缙) & Yan-yan Cai  (蔡燕燕)

  3. Engineering Faculty, China University of Geosciences, Wuhan, 430074, China

    Wen-bing Wu  (吴文兵)

Authors
  1. Jin Yu  (俞缙)
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  2. Yan-yan Cai  (蔡燕燕)
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  3. Wen-bing Wu  (吴文兵)
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Correspondence to Yan-yan Cai  (蔡燕燕).

Additional information

Foundation item: Projects(51109084/E090701; 51308234/E08061) supported by the National Natural Science Foundation of China; Project(2013J05079) supported by the Natural Science Foundation of Fujian Province, China; Project(Z012002) supported by the Open Research Fund of State Key Laboratory of Geomechanics and Geotechnical Engineering (Institute of Rock and Soil Mechanics, Chinese Academy of Sciences), China

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Yu, J., Cai, Yy. & Wu, Wb. Effect of sediment on vertical dynamic impedance of rock-socketed pile with large diameter. J. Cent. South Univ. 20, 2856–2862 (2013). https://doi.org/10.1007/s11771-013-1806-2

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  • DOI: https://doi.org/10.1007/s11771-013-1806-2

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