Abstract
This article proposes a new analytical model for the low-strain integrity detection of a pipe pile embedded in a viscoelastic soil layer with radial inhomogeneity by extending Novak’s plane-strain model and transfer method of complex stiffness to consider viscous-type damping. The analytical solutions for the complex impedance, the velocity admittance and the reflected wave signal of velocity at the pile head are also derived. Extensive parametric analyses are further conducted to investigate the effects of the disturbance degree and the disturbance range of surrounding soil due to construction operation on the velocity admittance and the reflected wave signal of velocity at the pile head. It is demonstrated that the proposed model and the obtained solutions can provide extensive scope of application, compared with the relevant existing solutions.
Highlights
The dynamic response of pile–soil interaction is an important topic for geotechnical engineering and soil dynamics
It can be observed that the degree of weakening of the surrounding soil due to construction disturbance has an obvious effect on the dynamic response at the pile head
Based on Novak’s plane-strain model, a new analytical model for the low-strain integrity detection of a pipe pile embedded in a viscoelastic soil layer with radial inhomogeneity is proposed by extending transfer method of complex stiffness to consider viscous-type damping
Summary
The dynamic response of pile–soil interaction is an important topic for geotechnical engineering and soil dynamics. In the early works of the problem of pile vibration, the surrounding soil is generally assumed to be radially homogeneous. This assumption may not be realistic when the construction disturbance is significant. To consider the radial inhomogeneity of the surrounding soil, Novak and colleagues[1,2] proposed an analytical model to investigate the effect of reduced resistance of the soil around the pile by defining a massless annular boundary zone in their pioneering studies. Veletsos and Dotson[3,4] extended Novak’s plane-strain model to further consider the inertia effect of the annular boundary zone. Nogami and Konagai[8,9] and El Naggar and Novak[10] considered the radial inhomogeneity of the surrounding soil by obtaining the coefficients of the complex
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