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  2025, Vol. 44 Issue (2): 505-518    DOI:
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Study on p-y curve characteristics of pile group soil dynamic interaction in overlaying water liquefied sites
LAN Tian1,LI Yurun1,YAN Zhixiao1,WANG Yongzhi2
(1. College of Civil Engineering and Transportation,Hebei University of Technology,Tianjin 300401,China;2. Key Laboratory of Earthquake Engineering and Engineering Vibration,Institute of Engineering Mechanics,
China Earthquake Administration,Harbin,Heilongjiang 150080,China)
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Abstract  Site liquefaction induced by significant seismic events constitutes a critical factor contributing to the structural damage observed in pile-supported bridge systems. Existing literature predominantly addresses typical sites that lack overlying water,thereby neglecting the implications of such water on pile-soil interaction dynamics. This investigation employs a centrifugal shaking table test,supplemented by numerical modeling,to elucidate the dynamic interaction characteristics between piles and soil within overlying water-liquefied contexts,utilizing p-y curves for analytical characterization. The results indicate that:(1) under substantial seismic loading,the soil stiffness surrounding piles in water-covered sites exhibits an increase,thereby demonstrating a degree of resilience to liquefaction;(2) the liquefaction processes in sites,regardless of the presence of overlying water,exhibit comparable characteristics,with the soil stiffness around piles initially diminishing before ultimately recovering;however,recovery in soil stiffness within water-covered liquefied sites occurs at a nominally slower rate subsequent to the stabilization of the excess pore pressure ratio;(3) an increase in overlying water depth corresponds to an elevation in the initial stiffness of the soil matrix while concurrently reducing the enclosed area of the hysteresis loop of the p-y curve,which adversely affects the dissipation of vibrational energy;(4) at lower amplitudes of input vibration,the presence of overlying water reduces the stiffness of the soil surrounding the pile,thereby amplifying the excess pore pressure ratio;conversely,at higher vibration amplitudes,overlying water increases the soil stiffness around the pile and diminishes the excess pore pressure ratio. The findings of this study provide crucial theoretical insights for the comprehensive evaluation of pile-soil dynamic interaction mechanisms in bridges situated within water-influenced liquefaction zones.
Key wordssoil mechanics      overlaying water liquefied sites      group piles      p-y curve      centrifuge test      numerical simulation     
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LAN Tian1
LI Yurun1
YAN Zhixiao1
WANG Yongzhi2
Cite this article:   
LAN Tian1,LI Yurun1,YAN Zhixiao1, et al. Study on p-y curve characteristics of pile group soil dynamic interaction in overlaying water liquefied sites[J]. , 2025, 44(2): 505-518.
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https://rockmech.whrsm.ac.cn/EN/Y2025/V44/I2/505
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