土体弱化对海上风电单桩基础的影响研究

Hazard Control in Tunnelling and Underground Engineering

2019, Vol. 1

Issue (4): 56-63 DOI:

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Study of soil degradation effects on offshore wind turbine with large-diameter pile foundation

LIU Run, HUANG Xuanzhi, YUAN Yu, MA Pengcheng

State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300072, China

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Abstract The large-diameter single-pile foundation is the main form of offshore wind turbine. It is of great significance to evaluate the horizontal bearing capacity of the pile foundation and the 1^st natural frequency of the wind turbine to optimize the design. The numerical analysis method of the strength degradation of soft clay based on non-linear kinematic hardening model was developed. The comparisons with triaxial tests and centrifuge test results showed that the method had reliabilities in analyzing the strength degradation of the soil and interaction of pile-soil system. The method analyzed the effects of cyclic loading on the stiffness of pile-soil system, the bearing capacity of pile foundation and the 1^st natural frequency of the wind turbine. The results showed that the effect of cyclic load amplitude was greater than the number of cycles when the number of cycles was small. The bending stiffness and flexural bearing capacity of the pile-soil system were attenuated more than the horizontal stiffness and the lateral bearing capacity. Due to the limited degree of stiffness attenuation, the overall first-order natural frequency of the wind turbine was not significantly reduced.

Key words： large-diameter pile soil degradation horizontal bearing capacity stiffness natural frequency finite element analysis(FEA)

Received: 01 August 2019 Published: 09 March 2020

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Cite this article:

LIU Run,HUANG Xuanzhi,YUAN Yu, et al. Study of soil degradation effects on offshore wind turbine with large-diameter pile foundation[J]. Hazard Control in Tunnelling and Underground Engineering, 2019, 1(4): 56-63.

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http://tunnel.sdujournals.com/EN/ OR http://tunnel.sdujournals.com/EN/Y2019/V1/I4/56

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