Dynamic characteristics of defective large diameter piles in saturated soil
WANG Kuihua1，2，XIAO Si1，2，WU Juntao1，2，GAO Liu1，2
(1. Research Center of Coastal and Urban Geotechnical Engineering，Zhejiang University，Hangzhou，Zhejiang 310058，China；
2. MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering，Zhejiang University，Hangzhou，Zhejiang 310058，China)
Abstract：In this paper，the dynamic characteristics of defective large diameter piles cast-in-place in saturated soil are investigated. Firstly，the frictional forces of the soil acting on the pile shaft according to the Biot?s theory of porous elastic medium considering the construction disturbance are obtained by using the complex stiffness transfer method. Then，the dynamic impedance and velocity response of the pile top are obtained considering the transverse inertia effect and combining the boundary conditions. Afterwards，the reliability of the obtained solution is verified by fitting the existing solution to the measured curve. Finally，a parametric study is conducted to give insight to the sensitivity of dynamic characteristics in low-strain integrity testing on defective piles.
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2018, Vol. 37 
