Considering radial deformation of pile and radial stress of saturated soil layers on the pile profile, and regarding the pile and soil layer as a single phase elastic medium and a saturated poro-viscoelastic medium, respectively, the dynamical behavior of vertical vibration of an end-bearing elastic hollow cylindrical pile in a saturated poro-viscoelastic soil layer is studied. With the Helmholtz decomposition and variable separation, the axisymmetrical analytical solutions for vertical stationary vibrations of hollow cylindrical piles and the analytical expression of complex dynamic stiffness of the pile top are presented in the frequency domain. The responses of dynamic stiffness factor and equivalent damping of pile top with frequency are shown using a numerical method. Effects of material and geometry parameters of the saturated poro-viscoelastic soil and pile on the dynamic stiffness factor and equivalent damping are examined. Although static stiffness of the pile top of a hollow cylindrical pile for the axisymmetrical analytical solution and classical Euler-rod model solution are almost the same, there exist distinct differences for dynamic stiffness factor and equivalent damping between the axisymmetrical analytical solution and classical Euler-rod model solution. Further, the ratio between the inner and outer radii of the hollow cylindrical pile has great influence on dynamic stiffness and equivalent damping of pile top. Therefore, there are limitations for the applicability of the pile with the classical Euler-rod model. A more accurate analysis should be based on the axisymmetrical model.
HAN Jing, YANG Xiao
. Axisymmetrical Vertical Vibration of Hollow Cylindrical Pile in Saturated Poro-Viscoelastic Soil Layer[J]. Journal of Shanghai University, 2014
, 20(5)
: 559
-572
.
DOI: 10.3969/j.issn.1007-2861.2013.07.038
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