HORIZONTAL BEARING CAPACITY OF OFFSHORE WIND TURBINE FOUR-PILE FOUNDATION IN SOFT CLAY SOIL

Zhao Zihao; Zhang Zhengfei; Du Wei; Wu Fengyuan

doi:10.19912/j.0254-0096.tynxb.2023-0875

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Acta Energiae Solaris Sinica ›› 2024, Vol. 45 ›› Issue (10) : 446-452. DOI: 10.19912/j.0254-0096.tynxb.2023-0875

HORIZONTAL BEARING CAPACITY OF OFFSHORE WIND TURBINE FOUR-PILE FOUNDATION IN SOFT CLAY SOIL

Zhao Zihao, Zhang Zhengfei¹, Du Wei⁴, Wu Fengyuan¹

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Abstract

In order to evaluate the influence of strain softening and strain rate effect on the horizontal bearing characteristics of the four-pile foundation, a two-dimensional plane tetrapod pile foundation model by ABAQUS is developed. The relationship between the change of the undrained shear strength su of soft clay with the cumulative plastic shear strain and the maximum shear strain rate is defined in the vumat user subroutine, and the effects of the strain softening parameters δrem, ξ95 and the strain rate parameter μ on the horizontal bearing characteristics of the four-pile foundation are analyzed. The analysis results show that the horizontal bearing capacity of the four-pile foundations decreases with the decrease of the strain softening parameters δrem and ξ95, among which δrem has a more significant effect on the horizontal bearing capacity; The strain rate parameter μ shows a linear positive correlation with the horizontal bearing capacity of the four-pile foundations. Finally, based on the study findings, an unified prediction model of the horizontal bearing capacity of four-pile foundations considering strain softening and strain rate effect is established.

Key words

offshore wind power / clay / strain rate / strain softening / horizontal bearing capacity / four-pile foundation

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Zhao Zihao, Zhang Zhengfei, Du Wei, Wu Fengyuan. HORIZONTAL BEARING CAPACITY OF OFFSHORE WIND TURBINE FOUR-PILE FOUNDATION IN SOFT CLAY SOIL[J]. Acta Energiae Solaris Sinica. 2024, 45(10): 446-452 https://doi.org/10.19912/j.0254-0096.tynxb.2023-0875

References

[1] 陈晓路, 管春雨, 张管武, 等. 近海风力机水平受荷单桩简化p-y曲线研究[J]. 太阳能学报, 2022, 43(5): 366-371.
CHEN X L, GUAN C Y, ZHANG G W, et al.Research on simplified p-y curves of lateral loaded monopile for offshore wind turbines[J]. Acta energiae solaris sinica, 2022, 43(5): 366-371.
[2] 乐丛欢, 姜明涛, 任建宇, 等. 筒间距对四筒导管架基础在砂土中承载特性的影响[J]. 太阳能学报, 2023, 44(1): 232-238.
LE C H, JIANG M T, REN J Y, et al.Influence of bucket spacing on bearing capacity of tetrapod suction bucket jacket in sand[J]. Acta energiae solaris sinica, 2023, 44(1): 232-238.
[3] GEORGIADIS K, SLOAN S W, LYAMIN A V.Ultimate lateral pressure of two side-by-side piles in clay[J]. Géotechnique, 2013, 63(9): 733-745.
[4] GEORGIADIS K, SLOAN S W, LYAMIN A V.Undrained limiting lateral soil pressure on a row of piles[J]. Computers and geotechnics, 2013, 54: 175-184.
[5] ZHAO Z H, KOURETZIS G, SLOAN S W, et al.Effect of geometric nonlinearity on the ultimate lateral resistance of piles in clay[J]. Computers and geotechnics, 2019, 105: 110-115.
[6] ZHAO Z H, LI D Y, ZHANG F, et al.Ultimate lateral bearing capacity of tetrapod jacket foundation in clay[J]. Computers and geotechnics, 2017, 84: 164-173.
[7] SHEIL B B.Lateral limiting pressure on square pile groups in undrained soil[J]. Géotechnique, 2021, 71(4): 279-287.
[8] ZHOU H, LIU H L, LI Y Z, et al.Limit lateral resistance of XCC pile group in undrained soil[J]. Acta geotechnica, 2020, 15(6): 1673-1683.
[9] 翟恩地, 徐海滨, 郭胜山, 等. 响水海上风电钢管桩基础水平承载特性对比研究[J]. 太阳能学报, 2019, 40(3): 681-686.
ZHAI E D,XU H B, GUO S S, et al.Comparative study on horizontal bearing capacity of steel pipe pile for Xiangshui offshore wind farm[J]. Acta energiae solaris sinica, 2019, 40(3): 681-686.
[10] EINAV I, RANDOLPH M F.Combining upper bound and strain path methods for evaluating penetration resistance[J]. International journal for numerical methods in engineering, 2005, 63(14): 1991-2016.
[11] ZHOU H, RANDOLPH M F.Resistance of full-flow penetrometers in rate-dependent and strain-softening clay[J]. Géotechnique, 2009, 59(2): 79-86.
[12] 焦钰祺, 贺林林, 梁越, 等. 考虑结构性黏土应变软化效应的桩靴竖向承载特性研究[J]. 岩土力学, 2022, 43(5): 1374-1382.
JIAO Y Q, HE L L, LIANG Y, et al.Study of vertical bearing capacity of spudcan foundations considering strain-softening effect of structured clay[J]. Rock and soil mechanics, 2022, 43(5): 1374-1382.
[13] 蒋明镜, 沈珠江. 考虑材料应变软化的柱形孔扩张问题[J]. 岩土工程学报, 1995, 17(4): 10-19.
JIANG M J, SHEN Z J.Expansion of cylindrical cavity of materials with strain-softening behaviour[J]. Chinese journal of geotechnical engineering, 1995, 17(4): 10-19.
[14] 吴宜鹏, 范庆来, 任增乾, 等. 考虑软土应变软化效应的深埋式大圆筒承载性状分析[J]. 防灾减灾工程学报, 2022, 42(4): 859-865.
WU Y P, FAN Q L, REN Z Q, et al.Bearing behavior of deeply-embedded large-diameter cylindrical structure considering strain softening effect of soft clay[J]. Journal of disaster prevention and mitigation engineering, 2022, 42(4): 859-865.
[15] ZHOU H J, RANDOLPH M F.Computational techniques and shear band development for cylindrical and spherical penetrometers in strain-softening clay[J]. International journal of geomechanics, 2007, 7(4): 287-295.
[16] ZHU B, DAI J L, KONG D Q, et al.Centrifuge modelling of uplift response of suction caisson groups in soft clay[J]. Canadian geotechnical journal, 2020, 57(9): 1294-1303.
[17] YU H, ZHOU H, SHEIL B, et al.Finite element modelling of helical pile installation and its influence on uplift capacity in strain softening clay[J]. Canadian geotechnical journal, 2022, 59(12): 2050-2066.
[18] EDMUND H.Numerical and experimental studies of shallow cone penetration in clay[D]. Oxford, South East England, UK: University of Oxford, 2008.
[19] RANDOLPH M F, HOULSBY G T.The limiting pressure on a circular pile loaded laterally in cohesive soil[J]. Géotechnique, 1984, 34(4): 613-623.