Abstract
A simplified method is presented to investigate the dynamic response of rock-socketed piles embedded in a layered foundation. The finite element method is utilized to derive the dynamic stiffness matrix equations of the pile modelled as a 1D bar, and the exact stiffness matrix method is employed to establish the flexibility matrix equations of the foundation modelled as a 3D body. According to the pilesoil interaction condition, these matrices are incorporated together to obtain the solution for the dynamic response of rock-socketed piles. Finally, some numerical results are given to illustrate the influence of rocksocketed depth on the pile vertical impedance.
Highlights
Pile foundations are widely used in the fields of building engineering, bridge engineering and offshore engineering, due to their higher bearing capacity and well stratigraphic adaptability
These dynamic loadings would lead to the decrease in the pile bearing capacity and would further result in the failure of the superstructures supported on pile foundations
Zeng and Rajapakse [3] discussed the effect of length/radius ration and excitation frequency on the dynamic response of the pile embedded in a poroelastic soil layer, and Lu et al [4] analyzed the vertical impedance of single piles in layered saturated media and concluded that the softer soil layer near the pile shaft has significant effect on the pile impedance
Summary
Pile foundations are widely used in the fields of building engineering, bridge engineering and offshore engineering, due to their higher bearing capacity and well stratigraphic adaptability. A combination of Greens functions and fictitious bar method, Rajapakse and Shah [2] further carried out a parametric study on the dynamic characteristics of single piles embedded in an elastic medium. A coupling method of BEM and FEM was employed by some researchers [7,8] to analyze the dynamic characteristics of pile-soil interaction system in order to estimate the dynamic stiffness and damping of the pile foundation. It is of great necessity to study the pile with its pile tip embedded in an elastic rock layer for better understanding the dynamic behaviour of pile foundations. This paper aims to propose a method to investigate the effects of rock-socketed depth on the vertical vibration characteristics of the pile with its pile tip embedded in an underlying rock layer. Some parametric studies are performed to discuss the influence of rock socketed depth on the dynamic pile impedance
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