Journal of Shanghai Jiao Tong University

Journal of Shanghai Jiaotong University >

2020 , Vol. 54 >Issue 12: 1316 - 1323

DOI: https://doi.org/10.16183/j.cnki.jsjtu.2019.094

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

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  • Research Center of Coastal and Urban Geotechnical Engineering; MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University, Hangzhou 310058, China

Received date: 2019-04-04

  Online published: 2020-12-31

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Abstract

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

Cite this article

HU Anfeng, NAN Bowen, CHEN Yuan, FU Peng . Modified p-y Curves Method Based on Degradation Stiffness Model of Sand[J]. Journal of Shanghai Jiaotong University, 2020 , 54(12) : 1316 -1323 . DOI: 10.16183/j.cnki.jsjtu.2019.094

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