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

被引：0

作者：

Liu R. ^{[1
]}

Su C. ^{[1
]}

Li C. ^{[1
]}

Jia Z. ^{[2
]}

Yuan X. ^{[3
]}

Liu Y. ^{[3
]}

机构：

[1] School of Civil Engineering, Tianjin University, Tianjin

[2] School of Water Conservancy and Hydroelectric, Hebei University of Engineering, Handan

[3] Huadian Heavy Industries Co.，Ltd., Tianjin

来源：

Taiyangneng Xuebao/Acta Energiae Solaris Sinica | 2024年 / 45卷 / 01期

关键词：

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

D O I：

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

中图分类号：

学科分类号：

摘要：

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. © 2024 Science Press. All rights reserved.

引用

页码：242 / 250

页数：8

共 18 条

[1] Lyu Z.W., Wang Y., Deng Q.R., Optimization of maintenance scheme for offshore wind turbines considering time window［J］, Acta energiae solaris sinica, 43, 10, pp. 177-185, (2022)
[2] 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, 41, 7, pp. 321-326, (2020)
[3] 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, 41, 12, pp. 297-304, (2020)
[4] 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, 40, 5, pp. 1433-1440, (2019)
[5] 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）, 53, 9, pp. 1711-1719, (2019)
[6] 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, 40, 12, pp. 3571-3577, (2019)
[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, pp. 842-867, (1955)
[8] Wang S.P., Study on time effect of PHC open-ended pile in deep soft soil［J］, Chinese journal of geotechnical engineering, 25, 2, pp. 239-241, (2003)
[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, 33, 2, pp. 209-218, (1996)
[10] Hwang J.H., Liang N., Chen C.H., Ground response during pile driving［J］, Journal of geotechnical and geoenvironmental engineering, 127, 11, pp. 939-949, (2001)

← 1 2 →