Vertical dynamic responses of pipe piles in saturated seabed soil subjected to Rayleigh wave action
NIU Xiaobo1, ZHANG Min1,2,3, ZHAO Canglong1
1.School of Civil Engineering, Taiyuan University of Technology, Taiyuan 030024, China;
2.School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang 330013, China;
3.School of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China
Abstract：The vertical dynamic responses of steel pipe piles under the action of Rayleigh wave in offshore environment were studied.Based on the Biot theory and ideal fluid control equation, in consideration of the displacement, stress and hydrodynamic pressure continuity conditions of overlying fluid and seabed surface, the free field wave solution of fluid-saturated medium under the action of Rayleigh wave was obtained.Considering the lateral inertia effect of large-diameter pipe piles, the frequency domain solution of vertical dynamic responses of pipe piles in bed soil under the action of Rayleigh wave was presented with the help of the vertical dynamic impedance of soil inside and outside the pipe piles.The results show that the vertical displacement of the seabed and the piles decreases with the increase of thickness of the fluid layer.When the thickness of the fluid layer exceeds 10 m, the vertical displacement of the piles remains unchanged.The increase of the pile diameter will gradually reduce the vertical displacement of the piles with different pile top mass, and it will eventually tend to the same value.The side friction of the pile decreases with the increase of the shear modulus of the soil under the seabed surface within a depth of 2.5 times wavelength.When the depth is further increased, it is basically the same.
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