Theoretical and experimental study on the longitudinal vibration of sand-filled nodular pipe piles in bidirectional inhomogeneous soil

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (14) : 43-52.

LIU Xin1,2，WANG Kuihua1,2，TU Yuan1,2

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Abstract

Sand-filled nodular pipe pile is a new type of composite pile foundation, which bears the upper load by combination of nodular pipe pile, sand-filled layer around the pile and foundation soil. Based on the axisymmetric viscoelastic soil model considering vertical wave effect, the dynamic response of this pile foundation is studied. Firstly, fictitious soil pile model is used to simulate the supporting function of soil at the pile bottom, and media around the pile is stratified at radial and longitudinal directions. Then interfacial contact stress between the pile and media around the pile is deduced by continuous conditions, and analytical solution of impedance as well as semi-analytical solution of velocity response in time domain at the pile top is calculated according to the Laplace Transform and impedance transfer function. Afterwards the effects of parameters of sand-filling layer and nodular parts are discussed. Finally, the theoretical calculation curve is compared with the measured curve in field test, whose results show that theoretical curve is in good agreement with the measured curve and the proposed model can reflect the dynamic response of sand-filled pipe pile under actual working conditions. The results have some value for theoretical research and engineering application related to longitudinal vibration of sand-filled nodular pipe pile.

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sand-filled nodular pipe pile / three-dimensional axisymmetric model / bidirection

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LIU Xin1,2，WANG Kuihua1,2，TU Yuan1,2. Theoretical and experimental study on the longitudinal vibration of sand-filled nodular pipe piles in bidirectional inhomogeneous soil[J]. Journal of Vibration and Shock, 2020, 39(14): 43-52

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