Journal of Shanghai Jiao Tong University ›› 2020, Vol. 54 ›› Issue (12): 1316-1323.doi: 10.16183/j.cnki.jsjtu.2019.094

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Modified p-y Curves Method Based on Degradation Stiffness Model of Sand

HU Anfeng(), NAN Bowen, CHEN Yuan, FU Peng   

  1. Research Center of Coastal and Urban Geotechnical Engineering; MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University, Hangzhou 310058, China
  • Received:2019-04-04 Online:2020-12-01 Published:2020-12-31


Most of the existing p-y curves are based on the model test results of small-diameter pile under cyclic loading of finite times, which makes it difficult to accurately describe the displacement accumulation of large-diameter pile under long-term horizontal cyclic loading and the cyclic weakening characteristics of soil. Therefore, based on the subroutine provided by Abaqus, a stiffness degradation model of the pile-soil system considering the long-term cyclic weakening effect of sand was established, and the p-y curves of large-diameter pile were obtained based on numerical analysis. Then, by introducing the concept of cyclic reaction ratio, the stiffness degradation factor of the pile-soil system was obtained, and the initial foundation reaction modulus was modified as well. Finally, a modified p-y curves method based on the degradation stiffness model of sand was proposed. By comparing with the test results, the validity of this method is verified. This modified p-y curves method, which is able to consider the effects of loading characteristics, number of cycles, cyclic weakening of sand stiffness, provides a concise and effective analysis method for the preliminary design of monopile foundation under long-term horizontal cyclic loading.

Key words: sand, monopile, degradation stiffness model, scale effect, cyclic loading, p-y curves

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