Abstract
Based on complex stiffness transfer model, the vertical vibration of tapered pile embedded in layered soil is theoretically investigated by considering the compacting effect of the soil layer surrounding the tapered pile in the piling process. Allowing for the stratification of the surrounding soil and variable crosssection of the tapered pile, the pile-soil system is discretized into finite segments. By virtue of the complex stiffness transfer model to simulate the compacting effect, the complex stiffness of different soil segments surrounding the tapered pile is obtained. Then, substituting the complex stiffness into the vertical dynamic governing equation of tapered pile, the analytical solution of vertical dynamic impedance of tapered pile under vertical exciting force is derived by means of the Laplace technique and impedance function transfer method. Based on the presented solutions, the influence of compacting effect of surrounding soil on vertical dynamic impedance at the pile head is investigated within the low frequency range concerned in the design of dynamic foundation.
Highlights
The influence of compacting effect on the bearing capacity of jacked pile is always a focus problem in the field of geotechnical engineering, and many researchers have paid their attention to investigate this problem systematically from two aspects
Lu et al [4] further indicated that the compacting effect was affected by both the vertical pressure applied by pile driver and driving process of jacked pile
Gong and Li [6] analyzed the mechanical problems of piling process in saturated soft clay and presented a systemic method to investigate the compacting effect of jacked pile
Summary
The influence of compacting effect on the bearing capacity of jacked pile is always a focus problem in the field of geotechnical engineering, and many researchers have paid their attention to investigate this problem systematically from two aspects. The research on the bearing capacity of tapered pile has been very extensive and in-depth, the investigation on the compacting effect caused. Mathematical Problems in Engineering by pile driving is still insufficient, especially the influence of compacting effect on the vertical dynamic response of tapered pile. There are only research results about the influence of compacting effect in pile driving process on the bearing capacity and ground heave presented by He et al [15]. In order to extend the application of tapered pile, this paper has introduced the complex stiffness transfer model [27] to simulate the radially inhomogeneous property of surrounding soil caused by compacting effect. The influence of compacting effect on the vertical dynamic impedance at the tapered pile head is studied in detail
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