T-EMSD-based <i>p</i>-<i>y</i> curve of laterally loaded piles in clay considering small-strain behavior

YU Jian; ZHU Jun-lin; HUANG Mao-song; SHEN Kan-min

doi:10.11779/CJGE202111009

Volume 43 Issue 11

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Chinese Journal of Geotechnical Engineering > 2021 > 43(11): 2029-2036. > DOI: 10.11779/CJGE202111009

YU Jian, ZHU Jun-lin, HUANG Mao-song, SHEN Kan-min. T-EMSD-based p-y curve of laterally loaded piles in clay considering small-strain behavior[J]. Chinese Journal of Geotechnical Engineering, 2021, 43(11): 2029-2036. DOI: 10.11779/CJGE202111009

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T-EMSD-based p-y curve of laterally loaded piles in clay considering small-strain behavior

YU Jian^{1, 2,},
ZHU Jun-lin^{1, 2},
HUANG Mao-song^{1, 2, ,},
SHEN Kan-min³

1.
Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China
2.
Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China
3.
Power-China Huadong Engineering Corporation Limited, Hangzhou 310058, China

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Received Date: March 08, 2021
Available Online: December 01, 2022

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Abstract

The international popular API code recommends the p-y curve method to analyze the nonlinear behavior of offshore wind turbine (OWT) steel pipe piles. The p-y curve controls the pile-soil nonlinear response only through one parameter regarding the development of stress-strain relation of soils. This over-simplification results in the inaccurate evaluation of the lateral initial stiffness of pile-soil and the underestimation of the bearing capacity. Therefore, the stress-strain curve with soil small-strain behavior is first introduced to achieve a numerical p-y backbone curve by using the total-displacement-loading extended mobilized strength design method (T-EMSD). The expression for the two-dimensional p-y backbone curve is then fitted from the numerical results. The three-dimensional effect of the proposed p-y curve is further considered by incorporating the three-dimensional ultimate capacity factor, the initial subgrade modulus and the compatibility factor. The rationality of the proposed p-y curve is verified against the results from the three-dimensional finite-element analysis and field tests. Compared with API code, the proposed p-y curve can provide a more reasonable prediction for both the bearing capacity and the initial stiffness of pile-soil by considering the soil small-strain behavior, which is a significant advantage for the OWT pile foundation with strict deformation control.
- laterally loaded pile,
- soft clay,
- p-y curve,
- T-EMSD method,
- small strain

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T-EMSD-based p-y curve of laterally loaded piles in clay considering small-strain behavior

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