Rock and Soil Mechanics ›› 2022, Vol. 43 ›› Issue (3): 777-788.doi: 10.16285/j.rsm.2021.5825

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Upper bound limit analysis of horizontal and moment ultimate bearing capacities of bucket foundation

WANG Jia-yu1, 2, LIU Run1, JI Yong-hong2, YANG Xu1, CHEN Guang-si1, WANG Xiao-lei3   

  1. 1. State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300072, China 2. Shanghai Municipal Engineering Design Institute (Group) Co., Ltd., Shanghai 200092, China 3. School of Civil Engineering, Hebei University of Engineering, Handan, Hebei 056038, China
  • Online:2022-03-17 Published:2022-05-17
  • Contact: LIU Run, female, born in 1974, PhD, Professor, research interests: interaction between structure and marine soil. E-mail:
  • About author:WANG Jia-yu, male, born in 1991, PhD, research interests: marine soil behavior.
  • Supported by:
    the National Natural Science Foundation for Distinguished Young Scholars of China(51825904).

Abstract: Offshore wind energy is one of the most important clean energy sources developing in China in recent years. As a new type of offshore wind turbine foundation, the wide-shallow bucket foundation with large diameter has a good ability to withstand moments. It is thus suitable for offshore region in China with soft clay deposits. Moreover, this type of foundation has advantages of onshore prefabrication, foundation-tower-turbine integrated floating transportation and suction installation, resulting in a good benefit for cost reduction. To better understand the bearing capacity of the wide-shallow bucket foundation in clay, numerical analyses are conducted to study the monotonic ultimate bearing behavior. The horizontal and moment ultimate bearing capacities and corresponding failure mechanisms are obtained. By building the velocity field based on the failure mechanisms of the bucket foundations, combined with the virtual work equation and the internal energy loss rate function, the upper bound solutions for the horizontal and moment ultimate bearing capacities of the bucket foundations are established and programmed using mathematical software. The results of the upper bound limit analysis have a good agreement with the calculation of the numerical analyses.

Key words: bucket foundation, upper bound limit analysis, ultimate bearing capacity, numerical method