MODEL TEST STUDY ON STRENGTH WEAKENING OF SOIL AROUND PILES DURING PILING OF OFFSHORE WIND POWER PILE FOUNDATION

Liu Yufei; Liu Run; Su Chunyang; Li Chengfeng; Jia Zhaolin; Yuan Xinyong

doi:10.19912/j.0254-0096.tynxb.2022-1491

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Acta Energiae Solaris Sinica ›› 2024, Vol. 45 ›› Issue (1) : 242-250. DOI: 10.19912/j.0254-0096.tynxb.2022-1491

MODEL TEST STUDY ON STRENGTH WEAKENING OF SOIL AROUND PILES DURING PILING OF OFFSHORE WIND POWER PILE FOUNDATION

Liu Run¹, Su Chunyang¹, Li Chengfeng¹, Jia Zhaolin², Yuan Xinyong³, Liu Yufei³

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Abstract

During the piling process of offshore wind turbine foundations, a noticeable phenomenon of soil strength degradation occurs around the pile. To comprehensively understand the factors and patterns influencing the weakening of soil strength around the pile, model experiments simulating the piling process were conducted. The study investigated the variation in lateral friction resistance along the pile body with penetration depth under different hammer impact energies and for various pile sizes. A degradation formula describing the pattern of soil strength reduction was established. Furthermore, employing piling software, an analysis was performed on field measurements of pile driving for large-diameter and extra-large-diameter steel pipe piles in multiple offshore wind turbine foundation projects. The research results indicate that during the piling process, the weakening of soil strength around the pile is simultaneously influenced by both pile mass and hammer impact energy. The higher the pile mass and hammer impact energy, the greater the degree of soil strength reduction. In the analysis of pile drivability, the degradation formula established in this study can simulate the reduction pattern of soil strength during the piling process for piles of different sizes.

Key words

offshore wind farms / pile foundations / pile driving / attenuation of soil strength / model test

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Liu Run, Su Chunyang, Li Chengfeng, Jia Zhaolin, Yuan Xinyong, Liu Yufei. MODEL TEST STUDY ON STRENGTH WEAKENING OF SOIL AROUND PILES DURING PILING OF OFFSHORE WIND POWER PILE FOUNDATION[J]. Acta Energiae Solaris Sinica. 2024, 45(1): 242-250 https://doi.org/10.19912/j.0254-0096.tynxb.2022-1491

References

[1] 吕致为, 王永, 邓奇蓉. 考虑时间窗约束的海上风电机组运维方案优化[J]. 太阳能学报, 2022, 43(10): 177-185.
LYU Z W, WANG Y, DENG Q R.Optimization of maintenance scheme for offshore wind turbines considering time window[J]. Acta energiae solaris sinica, 2022, 43(10): 177-185.
[2] 姜贞强, 郇彩云, 王胜利, 等. 海上风电单桩基础动力特性识别及现场测试[J]. 太阳能学报, 2020, 41(7): 321-326.
JIANG Z Q, HUAN C Y, WANG S L, et al.Dynamic characteristics identification of monopile offshore wind turbine and field tests[J]. Acta energiae solaris sinica, 2020, 41(7): 321-326.
[3] 许成顺, 孙毅龙, 翟恩地, 等. 海上风电单桩基础自振频率及参数影响分析[J]. 太阳能学报, 2020, 41(12): 297-304.
XU C S, SUN Y L, ZHAI E D, et al.Analysis on natural frequency and parameter influence of offshore wind power single pile foundation[J]. Acta energiae solaris sinica, 2020, 41(12): 297-304.
[4] 姜焱培, 王伟, 罗仑博, 等. 考虑桩周土体的海上风电大直径单桩变径体系1阶频率研究[J]. 太阳能学报, 2019, 40(5): 1433-1440.
JIANG Y P, WANG W, LUO L B, et al.Study on 1st order frequency of offshore wind turbines large diameter monopile of variable diameter system considering soil around monopile[J]. Acta energiae solaris sinica, 2019, 40(5): 1433-1440.
[5] 赵俭斌, 席义博, 王振宇. 海上风机单桩基础疲劳损伤计算方法[J]. 浙江大学学报(工学版), 2019, 53(9): 1711-1719.
ZHAO J B, XI Y B, WANG Z Y.Fatigue damage calculation method of monopile supported offshore wind turbine[J]. Journal of Zhejiang University (engineering science), 2019, 53(9): 1711-1719.
[6] 胡中波, 翟恩地, 罗仑博, 等. 基于静载试验的海上风电钢管桩砂土p-y曲线研究[J]. 太阳能学报, 2019, 40(12): 3571-3577.
HU Z B, ZHAI E D, LUO L B, et al.Study on p-y curves of steel pipe piles for offshore wind farms in sand based on in situ tests[J]. Acta energiae solaris sinica, 2019, 40(12): 3571-3577.
[7] SEED H B, REESE L C.The action of soft clay along friction piles[C]//Proceedings of the 4th International Conference on Soil Mechanics and Foundation Engineering. London, UK, 1955: 842-867.
[8] 王戍平. 深厚软土中PHC长桩的时效性试验研究[J]. 岩土工程学报, 2003, 25(2): 239-241.
WANG S P.Study on time effect of PHC open-ended pile in deep soft soil[J]. Chinese journal of geotechnical engineering, 2003, 25(2): 239-241.
[9] EIGENBROD K D, ISSIGONIS T.Pore-water pressures in soft to firm clay during driving of piles into underlying dense sand[J]. Canadian geotechnical journal, 1996, 33(2): 209-218.
[10] HWANG J H, LIANG N, CHEN C H.Ground response during pile driving[J]. Journal of geotechnical and geoenvironmental engineering, 2001, 127(11): 939-949.
[11] AIRHART T P, COYLE H M, HIRSCH T J, et al.Pile-soil system response in a cohesive soil[M]//Performance of Deep Foundations. West Conshohocken: ASTM International, 2009: 264.
[12] 杨国权, 刘海波. 锤击法与静压法施工预制桩单桩承载力差异分析[J]. 探矿工程(岩土钻掘工程), 2009, 36(3): 53-56.
YANG G Q, LIU H B.Analysis on the difference of prefabricated single pile bearing capacity between construction by hammer-driven and static-pressure[J]. Exploration engineering (rock & soil drilling and tunneling), 2009, 36(3): 53-56.
[13] 刘润, 董伟, 禚瑞花, 等. 土体疲劳对打桩分析的影响[J]. 海洋技术, 2005, 24(4): 68-72.
LIU R, DONG W, ZHUO R H, et al.The influence of soil fatigue on pile drivability[J]. Ocean technology, 2005, 24(4): 68-72.
[14] 刘润, 闫澍旺. 大直径超长桩打桩过程中桩周土体的疲劳与强度恢复[J]. 岩土力学, 2009, 30(2): 452-456.
LIU R, YAN S W.Research on soil fatigue and restoration during deep penetration large diameter pile driving[J]. Rock and soil mechanics, 2009, 30(2): 452-456.
[15] YAN S W, ZHAO L.Study on soil fatigue effect in the drivability analysis for foundation piles of offshore oil platform[C]//2010 International Conference on Mechanic Automation and Control Engineering. Wuhan, China, 2010: 4738-4741.
[16] 邵红杰, 刘润, 林敏博, 等. 海上打桩过程中桩周土体强度弱化的数值模拟[J]. 岩土工程学报, 2013, 35(S1): 354-359.
SHAO H J, LIU R, LIN M B, et al.Numerical simulation method for soil strength reduction during pile driving in offshore engineering[J]. Chinese journal of geotechnical engineering, 2013, 35(S1): 354-359.
[17] 孟祥然. 海上大直径钢管桩打桩过程中桩周土阻力弱化研究[D]. 天津: 天津大学, 2021.
MENG X R.Study on the weakening of soil resistance around large diameter steel pipe pile during pile driving[D]. Tianjin: Tianjin University, 2021.
[18] 刘润, 闫澍旺. 海洋大直径钢管桩工程[M]. 北京: 中国水利水电出版社, 2016.
LIU R, YAN S W.Ocean large diameter steel pipe pile engineering[M]. Beijing: China Water & Power Press, 2016.