Abstract：As a novel type of pile foundation, the investigation into the dynamic characteristics of stiff composite piles holds substantial theoretical significance for geotechnical engineering. Grounded in the principles of soil dynamics and pile foundation vibration theory, this study systematically examines the vertical displacement response at the pile head and along the pile shaft of stiff composite piles embedded in viscoelastic saturated soil layers under the influence of vertically incident seismic P-waves. Initially, a wave equation for saturated soil is formulated in cylindrical coordinates based on Biot?s porous medium theory. Subsequently, by integrating the vertical vibration equation for strength composite piles, a closed-form series solution for the longitudinal displacement of the soil skeleton is derived, leading to an analytical solution for the vertical displacement of strength composite piles under specified boundary conditions. Finally, through computational examples and parametric studies, this work elucidates the dynamic behavior of the interaction system between strength composite piles and saturated soil subjected to vertical seismic P-wave action at the pile tip. The findings indicate that moderately reducing the radius of the concrete core pile while increasing its length can enhance its vertical seismic resistance; conversely, during high-frequency stages, an increase in elastic modulus of the cement outer pile may detrimentally affect the seismic performance of strength composite piles. In designing these structures, it is recommended that the radius of concrete core piles be maintained within 40% to 60% of their total radius while setting their length to 20 to 40 times this radius. Additionally, it is advisable that the elastic modulus for cement outer piles be established at 2% to 5% relative to that of concrete core piles.
周凤玺，孙烈璞，柳鸿博，刘志义，曹小林. 饱和地基中劲性复合桩在垂直入射P波作用下的竖向运动响应分析[J]. 岩石力学与工程学报, 2025, 44(S2): 283-292.
ZHOU Fengxi, SUN Liepu, LIU Hongbo, LIU Zhiyi, CAO Xiaolin. Vertical kinematic response of strength composite pile in saturated foundation under vertically-incident P-waves. , 2025, 44(S2): 283-292.
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2025, Vol. 44 
