Bearing characteristics of pile–bucket composite foundations for offshore wind turbines

SUN Yan-guo; XU Cheng-shun; DU Xiu-li; WANG Pi-guang; XI Ren-qiang; SUN Yi-long

doi:10.13374/j.issn2095-9389.2022.02.11.001

Volume 45 Issue 3

Mar. 2023

Turn off MathJax

Article Contents

Article Navigation > Chinese Journal of Engineering > 2023 > 45(3): 489-498

SUN Yan-guo, XU Cheng-shun, DU Xiu-li, WANG Pi-guang, XI Ren-qiang, SUN Yi-long. Bearing characteristics of pile–bucket composite foundations for offshore wind turbines[J]. Chinese Journal of Engineering, 2023, 45(3): 489-498. doi: 10.13374/j.issn2095-9389.2022.02.11.001

Citation:

SUN Yan-guo, XU Cheng-shun, DU Xiu-li, WANG Pi-guang, XI Ren-qiang, SUN Yi-long. Bearing characteristics of pile–bucket composite foundations for offshore wind turbines[J]. Chinese Journal of Engineering, 2023, 45(3): 489-498. doi: 10.13374/j.issn2095-9389.2022.02.11.001

Citation:

SUN Yan-guo, XU Cheng-shun, DU Xiu-li, WANG Pi-guang, XI Ren-qiang, SUN Yi-long. Bearing characteristics of pile–bucket composite foundations for offshore wind turbines[J]. Chinese Journal of Engineering, 2023, 45(3): 489-498. doi: 10.13374/j.issn2095-9389.2022.02.11.001

PDF( 2261 KB)

Bearing characteristics of pile–bucket composite foundations for offshore wind turbines

doi: 10.13374/j.issn2095-9389.2022.02.11.001

Key Laboratory of Urban Security and Disaster Engineering, Beijing University of Technology, Beijing 100124, China

More Information

Corresponding author: E-mail: xuchengshun@bjut.edu.cn
Received Date: 2022-02-11
Available Online: 2022-11-04
Publish Date: 2023-03-01

Abstract

Abstract

Offshore wind power has been the fastest-growing form of renewable energy for the last few years, owing to its effectiveness in achieving carbon neutrality through a reasonable and efficient utilization of wind power resources. With offshore wind farms gradually developing into the deep and far sea, greater attention is paid to the bearing characteristics of foundations for offshore wind turbines. Therefore, it becomes significantly important to explore new foundations, effectively promoting the development of offshore wind power. Numerous researchers have substantially investigated novel foundations for offshore wind turbines to help with offshore wind farm construction. Compared to other foundations, the pile–bucket composite foundation has obvious advantages in terms of bearing performance. In this paper, a series of numerical calculation models for pile–bucket composite foundations in heterogeneous saturated clay are established using the finite element software ABAQUS. Additionally, the undrained shear strength changes with depth are examined via field variables to explain soil heterogeneity in the finite element model. Next, the displacement control method is adopted to apply the vertical loading V, horizontal loading H, and bending moment M at the top of the foundation. Simultaneously, the ultimate bearing capacity of the foundations is obtained by the double tangent method, and the bearing capacity factors of each load direction are obtained by normalizing the ultimate bearing capacity in different calculations. To obtain the preliminary design method for the size of pile–bucket composite foundation, the priority of influencing factors is studied through the orthogonal test. The results show that the saturated clay coefficient K has a nominal effect on the vertical bearing capacity coefficient N_cV. When K is different, N_cV remains almost unchanged for a certain foundation. Concerning the impact of bucket shapes on the bearing capacity coefficient in three directions, great interaction is observed between the diameter D and the buried depth L of the bucket structure. The diameter of the bucket has the greatest influence on the bearing characteristics of the pile–bucket composite foundations, wherein increasing the former can significantly improve the latter. The research results provide a reference for the design of the pile–bucket composite foundation of an offshore wind turbine.
- offshore wind turbine,
- pile–bucket composite foundations,
- heterogeneous saturated clay,
- bearing capacity factor,
- orthogonal test

FullText(HTML)

References(28)

References

[1]	Sun X J, Huang D G, Wu Jpomg Q. The Current state of offshore wind energy technology development. Energy, 2012, 41(1): 298 doi: 10.1016/j.energy.2012.02.054
[2]	Zou C N, Xiong B, Xue H Q, et al. The role of new energy in carbon neutral. Petroleum Explor Dev, 2021, 48(2): 480 doi: 10.1016/S1876-3804(21)60039-3
[3]	Esteban M D, Diez J J, López J S, et al. Why offshore wind energy? Renew Energy, 2011, 36(2): 444
[4]	Díaz H, Soares C G. Review of the current status, technology and future trends of offshore wind farms. Ocean Eng, 2020, 209: 107381 doi: 10.1016/j.oceaneng.2020.107381
[5]	Veers P, Dykes K, Lantz E, et al. Grand challenges in the science of wind energy. Science, 2019, 366(6464): eaau2027 doi: 10.1126/science.aau2027
[6]	Desmond C, Murphy J, Blonk L, et al. Description of an 8 MW reference wind turbine. J Phys:Conf Ser, 2016, 753: 092013 doi: 10.1088/1742-6596/753/9/092013
[7]	孔德森, 劉一, 鄧美旭, 等. 非均質土中海上風電單樁基礎動力響應特性. 工程科學學報, 2021, 43(5):710 Kong D S, Liu Y, Deng M X, et al. Dynamic response characteristics of an offshore, wind-power monopile foundation in heterogeneous soil. Chin J Eng, 2021, 43(5): 710
[8]	宋波, 趙偉娜, 雙妙. 沖刷深度對海上風電塔地震動力響應的影響分析. 工程科學學報, 2019, 41(10):1351 Song B, Zhao W N, Shuang M. Analysis of the influence of scour depth on the dynamic response of offshore wind turbine towers under earthquake action. Chin J Eng, 2019, 41(10): 1351
[9]	Faizi K, Faramarzi A, Dirar S, et al. Investigating the monotonic behaviour of hybrid tripod suction bucket foundations for offshore wind towers in sand. Appl Ocean Res, 2019, 89: 176 doi: 10.1016/j.apor.2019.05.018
[10]	Yang Q, Yu P, Liu Y F, et al. Scour characteristics of an offshore umbrella suction anchor foundation under the combined actions of waves and currents. Ocean Eng, 2020, 202: 106701 doi: 10.1016/j.oceaneng.2019.106701
[11]	Li H J, Liu H J, Liu S Y. Dynamic analysis of umbrella suction anchor foundation embedded in seabed for offshore wind turbines. Geomech Energy Environ, 2017, 10: 12 doi: 10.1016/j.gete.2017.05.002
[12]	Wang X F, Zeng X W, Yang X, et al. Feasibility study of offshore wind turbines with hybrid monopile foundation based on centrifuge modeling. Appl Energy, 2018, 209: 127 doi: 10.1016/j.apenergy.2017.10.107
[13]	朱東劍. 筒型基礎與單樁相結合的新型復合風電基礎研究[學位論文]. 天津: 天津大學, 2012 Zhu D J. Research of a New Type of Foundation for Offshore Wind Turbines with the Combining of Monoplie Foundation and Bucket Foundation [Dissertation]. Tianjin: Tianjin University, 2012
[14]	劉潤, 李寶仁, 練繼建, 等. 海上風電單樁復合筒型基礎樁筒共同承載機制研究. 天津大學學報(自然科學與工程技術版), 2015, 48(5):429 Liu R, Li B R, Lian J J, et al. Bearing characteristics of pile–bucket composite foundation for offshore wind turbine. J Tianjin Univ (Sci Technol), 2015, 48(5): 429
[15]	劉潤, 祁越, 李寶仁, 等. 復合加載模式下單樁復合筒型基礎地基承載力包絡線研究. 巖土力學, 2016, 37(5):1486 doi: 10.16285/j.rsm.2016.05.033 Liu R, Qi Y, Li B R, et al. Failure envelopes of single-pile composite bucket foundation of offshore wind turbine under combined loading conditions. Rock Soil Mech, 2016, 37(5): 1486 doi: 10.16285/j.rsm.2016.05.033
[16]	Wang J Y, Sun G D, Chen G S, et al. Finite element analyses of improved lateral performance of monopile when combined with bucket foundation for offshore wind turbines. Appl Ocean Res, 2021, 111: 102647 doi: 10.1016/j.apor.2021.102647
[17]	Chen D, Gao P, Huang S S, et al. Static and dynamic loading behavior of a hybrid foundation for offshore wind turbines. Mar Struct, 2020, 71: 102727 doi: 10.1016/j.marstruc.2020.102727
[18]	劉紅軍, 張鵬, 王荃迪, 等. 樁筒復合基礎筒體結構優化及承載性能分析. 哈爾濱工程大學學報, 2018, 39(7):1165 doi: 10.11990/jheu.201701022 Liu H J, Zhang P, Wang Q D, et al. Optimum structural design and loading advantage analysis of pile–bucket foundation. J Harbin Eng Univ, 2018, 39(7): 1165 doi: 10.11990/jheu.201701022
[19]	Li X Y, Zeng X W, Wang X F. Feasibility study of monopile-friction wheel-bucket hybrid foundation for offshore wind turbine. Ocean Eng, 2020, 204: 107276 doi: 10.1016/j.oceaneng.2020.107276
[20]	Mehravar M, Harireche O, Faramarzi A. Evaluation of undrained failure envelopes of caisson foundations under combined loading. Appl Ocean Res, 2016, 59: 129 doi: 10.1016/j.apor.2016.05.001
[21]	Hung L C, Kim S R. Evaluation of combined horizontal-moment bearing capacities of tripod bucket foundations in undrained clay. Ocean Eng, 2014, 85: 100 doi: 10.1016/j.oceaneng.2014.04.025
[22]	Yun G, Bransby M F. The horizontal-moment capacity of embedded foundations in undrained soil. Can Geotech J, 2007, 44(4): 409 doi: 10.1139/t06-126
[23]	Hung L C, Kim S R. Evaluation of undrained bearing capacities of bucket foundations under combined loads. Mar Georesources Geotechnol, 2014, 32(1): 76 doi: 10.1080/1064119X.2012.735346
[24]	肖忠, 王琰, 王元戰, 等. 桶間距對四桶吸力式基礎各單向承載力的影響及最優間距的確定. 巖土力學, 2018, 39(10):3603 doi: 10.16285/j.rsm.2017.2277 Xiao Z, Wang Y, Wang Y Z, et al. Effect of bucket separation distance on bearing capacity of tetrapod bucket foundations and determination of optimal separation distance. Rock Soil Mech, 2018, 39(10): 3603 doi: 10.16285/j.rsm.2017.2277
[25]	Hung L C, Kim S R. Evaluation of vertical and horizontal bearing capacities of bucket foundations in clay. Ocean Eng, 2012, 52: 75 doi: 10.1016/j.oceaneng.2012.06.001
[26]	Butterfield R, Houlsby G T, Gottardi G. Standardized sign conventions and notation for generally loaded foundations. Géotechnique, 1997, 47(5): 1051
[27]	Byrne B W, Cassidy M J. Investigating the response of offshore foundations in soft clay soils // Proceedings of ASME 2002 21st International Conference on Offshore Mechanics and Arctic Engineering. Oslo, 2009: 263
[28]	任露泉. 試驗設計及其優化. 北京: 科學出版社, 2009 Ren L Q. Experimental Design and Optimization. Beijing: Science Press, 2009