A study on the lateral vibration of saturated soil-pipe pile-rigid platform

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (12) : 126-132.

LIU Linchao,YAN Qifang

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Abstract

Based on the theory of saturated porous media, a system model of saturated soil-pipe pile-rigid platform coupling system was established, and the dynamic properties of saturated soil-pipe pile-rigid platform coupling system under horizontal harmonic load was studied.The soil around the pipe pile and pile core soil were regarded as saturated soil, and the equations of motion of saturated soil were given based on the theory of porous media, the motion equations of platform were established by regarding the platform as rigid body.The solution of horizontal vibration of saturated soil around the pile and pile core saturated soil were obtained through the method of separation of variables by considering boundary conditions of the soil and the continuity conditions of pile-soil.The solution of the lateral vibration of the pipe pile was obtained by considering the boundary condition of pipe pile ends with the initial parameter method, and we also obtained the analytical solution in frequency domain of the horizontal displacement of the rigid platform by the transfer matrix method considering the continuity conditions of the pipe pile-rigid platform.Numerical examples show that the saturated soil-pipe pile-rigid platform coupling system has obvious resonance under horizontal harmonic load, it is easy to cause resonance when the pipe pile wall is too thin, and the existence of pile core soil can improve the seismic performance of the saturated soil-pipe pile-rigid platform system, and increasing the buried depth of the pipe pile can significantly reduce the horizontal displacement amplitude of the rigid platform, reducing the height and the mass of the platform is helpful to provide the seismic performance of the system.

Key words

saturated soil-pipe pile-rigid platform / lateral vibration / displacement amplification facto / seismic performance / transfer matrix method

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LIU Linchao,YAN Qifang. A study on the lateral vibration of saturated soil-pipe pile-rigid platform[J]. Journal of Vibration and Shock, 2019, 38(12): 126-132

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