Vertical seismic responses of floating hollow pipe piles in layered soils
ZHANG Shiping1, 2, 3, ZHU Mingyue1, 2, 3
(1. School of Transportation, Changsha University of Science and Technology, Changsha, Hunan 410114, China; 2. National Engineering Research Center of Highway Maintenance Technology, Changsha, Hunan 410114, China; 3. International Innovation Cooperation Base of Advanced Highway Construction and Maintenance Technology in Hunan Province, Changsha, Hunan 410114, China)
Abstract：Soil typically exhibits a layered distribution due to long-term sedimentation and geological tectonic activities. The seismic response characteristics of pipe piles embedded in such stratified soil are highly complex, particularly regarding the vertical seismic response of friction-type hollow pipe piles, which warrants further investigation. This paper presents a semi-analytical solution for the dynamic responses of a floating tubular pile in layered soil subjected to time-harmonic seismic P-waves. The solution accounts for the dynamic interactions among the soil surrounding the pile, the pipe pile itself, and the soil beneath the pile, as well as the effects of soil stratification properties. The pile is modeled as an elastic hollow pipe structure, with the soil within its vertical projection area treated as a soil column, while the surrounding soil and the soil column are modeled as a multilayered continuum. Utilizing Hamilton?s variational principle, the equations of motion for the pile and the soil column, along with the pile-soil continuity conditions, are derived. The separation of variables technique and an iterative method are employed to solve these equations of motion for the pile-soil system, incorporating the pile-soil boundary and continuity conditions. This results in a frequency-domain semi-analytical solution for the kinematic responses of the pile-soil system to seismic P-waves. The proposed solution is validated through comparison with existing solutions. Additionally, numerical analyses are conducted to investigate the seismic pile-soil interaction effects across various material and geometric parameters. The results indicate that the layered nature of the soil surrounding the pile and the supporting conditions at the pile base significantly influence the seismic response of the pile to P-waves. Notably, the seismic response of friction-type piles in layered soils under P-waves differs substantially from that of end-bearing piles in homogeneous soils. Furthermore, existing solutions for homogeneous soil or end-bearing piles can be derived through parameter degradation of the developed solution. Additionally, when the inner diameter of the pipe pile exceeds 0.2 m, variations in its size significantly impact the seismic response of the pile-soil system under P-waves; conversely, when the inner diameter is 0.2 m or less, tubular piles exhibit seismic response characteristics comparable to those of solid piles with the same outer radius.
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