Horizontal vibration response of defective large-diameter piles embedded in saturated soils
FAN Xiaoxue1，2，LI Yuan1，2，WU Wenbing1，2，3，CHEN Yaochun1，2，4，WANG Xinguo1，2，4，LIU Hao1，2，#br# LIANG Rongzhu1，2，3
(1. Faculty of Engineering，China University of Geosciences，Wuhan，Hubei 430074，China；2. Engineering Research Center of Rock-soil Drilling and Excavation and Protection，Ministry of Education，China University of Geosciences，Wuhan，Hubei 430074，China；3. Guangxi Key Laboratory of Disaster Prevention and Structural Safety，Guangxi University，Nanning，Guangxi 530004，China；4. China Railway Siyuan Survey and Design Group Company Limited，Wuhan，Hubei 430063，China)
Abstract：To investigate the horizontal dynamic response of defective large-diameter piles embedded in layered saturated soils，a horizontal coupling dynamic simplified model of the defective large-diameter pile-saturated soil is established based on Biot's theory and strict plane strain assumptions. The potential function，operator decomposition method and variable separation method are introduced herein to obtain the horizontal force of the soil acting on the pile shaft，and then，the complex impedance of the pile top is derived by employing the coupling condition of the pile-soil contact interface and the stiffness matrix transfer method. The reliability of the obtained solution is verified by model comparison and degradation comparison. The results show that the enlarging segments of the pile contribute little to the increase of the complex impedance while the necking defects can significantly decrease the complex impedance. The dynamic stiffness of the pile top is more sensitive to the radius and length of the defect than the dynamic damping，and the necking defects near the pile head can more seriously reduce the complex impedance in comparison with those in the middle of the pile shaft or near the pile tip.
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2020, Vol. 39 
