Dynamic response of a large diameter pile considering the interaction of variable pile section with surrounding layered three-dimensional soil
WANG Kuihua1，2，GAO Liu1，2，WU Juntao1，2，XIAO Si1，2
(1. Research Center of Coastal and Urban Geotechnical Engineering，Zhejiang University，Hangzhou，Zhejiang 310058，China；2. Key Laboratory of Soft Soils and Geoenvironmental Engineering of Ministry of Education，Zhejiang University，Hangzhou，Zhejiang 310058，China)
Abstract：The interaction between the surrounding soil and pile with variable cross-section is represented by a Voigt model and the spring constant and damper coefficient is derived. Thus a more rigid pile-soil interaction model considering the interaction of variable pile section and surrounding soil is proposed. An amended impedance function transfer method is proposed by taking Laplace transforms on the continuity conditions of displacement and stress. The surrounding soil layers are modeled as a three-dimensional axisymmetric continuum and the pile is assumed to be a Rayleigh-Love rod with material damping to study the transverse inertial effect of the pile of large diameter. The impedance function at pile top is derived with the amended impedance function transfer method proposed in this paper. Then the velocity response at pile top is obtained. The solutions with and without the interaction of variable pile section with surrounding soil are compared. Meanwhile the coupling between the related parameters and the interaction of variable pile section with surrounding soil are analyzed.
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2017, Vol. 36 
