Axisymmetric vertical vibration of composite cylindrical pile in saturated soil layer

作者：Yang Xiao^*; Jiang Zhiyun

来源：China Civil Engineering Journal, 2014, 47(10): 96-106.

• Axisymmetric
• Cylindrical piles
• Dynamical interactions
• Parameter studies
• Saturated porous media
• Vertical vibrations

Based on the theory of elasticity and theory of saturated porous media with regarding the composite cylindrical pile as an elastic media and the soil layer as a saturated viscoelastic medium, respectively, the vertical stationary vibration of an end-bearing elastic composite cylindrical pile in a saturated poro-viscoelastic soil layer is investigated with the effects of the radial deformation of the pile and radial stress of the saturated soil layer on the pile shaft taken into account. The analytical solution for axisymmetric vertical vibration of the composite cylindrical pile and the analytical expression for the complex dynamic stiffness of the pile top are presented in the frequency domain. The response curves for dynamic stiffness factor and equivalent damping of pile top against the exciting frequency are shown, and the influences of soil parameters, modulus ratio, slenderness ratio of the pile and ratio of the inner radius to outer radius of the composite pile, etc. on the dynamic stiffness factor and equivalent damping are examined. It is shown that, although the static stiffness of the pile top of the composite cylindrical pile from the exact axisymmetric solution is almost same as the classical Euler-rod model solution, for the stocky composite cylindrical pile, the amplitudes of dynamic stiffness factor and equivalent damping of the axisymmetric model are less than those of classical Euler-rod model. Additionally, the ratio of the inner radius to outer radius of the composite cylindrical pile has a great influence on the dynamic stiffness factor and equivalent damping.

• 出版日期2014
• 单位上海大学