Response of saturated clay ground during pile driving#br#
MA Xiaodong1，ZHU Guofu1，LIU Lisheng1，ZHANG Zhiming2#br#
(1. Hubei Key Laboratory of Theory and Application of Advanced Materials Mechanics，Wuhan University of Technology，Wuhan，Hubei 430070，China；2. CCCC Second Harbor Engineering Company Ltd.，Wuhan，Hubei 430040，China)
Abstract：In this paper，a finite element model was developed for the first time to simulate the driving process and response of a pile into a saturated clay soil from the ground surface to an embedment depth. Based on the calculated results，the influence zone of pile driving was determined and the response of the excess pore water pressure of the soil to pile driving was presented. For a given depth，the buildup of the excess pore water pressure has good dimensionless characteristics with respect to the pile diameter，in other words，the distributions of the maximum excess porewater pressure in the radial direction for different pile diameters basically coincide with each other when the radial distance is normalized by the pile diameter. Moreover，it is found that，in a semi-logarithmic coordinate system，the normalized maximum excess pore water pressure approximately follows a linear relationship with the radial distance. Comparisons among finite element simulation，calculation by the theory of cylindrical cavity expansion and the field measurements indicate that the finite element analysis results are in a good agreement with the published field measurements while there exists a discrepancy between the finite element analysis results(or field measurements) and calculation results by the cylindrical expansion theory，which is resulted from that the shear force around the pile shaft is neglected in the cylindrical expansion theory while the actual piling process is fully simulated in the finite element analysis.
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2020, Vol. 39 
