考虑施工扰动效应时大直径扩底桩纵向振动阻抗研究

doi:10.13722/j.cnki.jrme.2016.0588

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Abstract

Based on the Rayleigh-Love rod model，the longitudinal dynamic impedance of a large-diameter belled pile is theoretically investigated considering the construction disturbance effect. First，the virtual soil pile model and the shear complex stiffness transfer method are adopted to simulate the vertical inhomogeneity of the pile end soil and the radial inhomogeneity of the surrounding soil caused by the construction disturbance effect，respectively. Then，the shear complex stiffness at the pile-soil interface is solved and is substituted into the governing equation of the pile. Meanwhile，the analytical solution for the dynamic response at the pile head is obtained in the frequency domain by virtue of impedance function transfer method and Laplace transform method. On this basis，comparisons with published solutions are carried out to verify the reliability of the present solution. Finally，by means of parametric analysis method，the influence of pile parameters and the construction disturbance effect on the complex impedance at the pile head is investigated within the low frequency range concerned in the design of dynamic foundation. The results show that：(1) the influence of the radius of the enlarged base on the complex impedance at the pile head is much greater than that of the length of the enlarged base. (2) The dynamic characteristic of the large-diameter belled pile is greatly affected by the construction disturbance effect，besides，the influence of the disturbance of the pile surrounding soil is greater than that of the disturbance of the pile end soil.

Key words： pile foundation large-diameter belled pile longitudinal vibration complex impedance construction disturbance effect shear complex stiffness transfer method virtual soil pile

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	Articles by authors
	LI Zhenya1
	2
	WANG Kuihua1
	2
	WU Wenbing3

Cite this article:

LI Zhenya1,2,WANG Kuihua1, et al. Longitudinal dynamic impedance of a large-diameter belled pile considering construction disturbance effect[J]. , 2017, 36(S1): 3678-3688.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2016.0588 OR https://rockmech.whrsm.ac.cn/EN/Y2017/V36/IS1/3678

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