摘要
[目的]江苏省主要风电工程位于岸外辐射沙洲海域,研究该地层大直径单桩承载性能具有重要意义。[方法]基于辐射沙洲钢管桩试桩试验,建立单桩基础FLAC^(3D)数值模型,开展不同直径钢管桩基础承载性能数值模拟研究。[结果]结果表明:FLAC^(3D)数值模拟所得钢管桩桩顶的竖向荷载-位移曲线(Q-s曲线)与实测曲线变化趋势基本一致;随着埋深的增加,泥面以下桩身轴力不断减小,桩侧摩阻力为轴向承载力的主要提供来源,桩端阻力所提供的轴向承载力相对较小;桩径与钢管桩极限竖向承载力符合非性关系,单桩极限竖向承载力随着桩径的增大而增大,当桩径增加2倍,相应的竖向极限荷载增加3倍。[结论]相应结果可对实际工程提供参考。
[Introduction]Wind power projects in Jiangsu Province are mainly located in the offshore radiant sandbank sea area.It is of great significance to study the bearing capacity of the large diameter single pile in this stratum.[Method]Based on the test pile test of the steel pipe pile in the radiant sandbank area,the FLAC^(3D) numerical model of the single pile foundation was established,and the numerical simulation study of bearing performance of steel pipe pile foundations with different diameters was carried out.[Result]The results show that:The vertical load-displacement(Q-s)curve of the steel pipe obtained by FLAC^(3D) numerical simulation is basically consistent with the change trend of the measured curve;as the burial depth increases,the axial force of the pile body below the mud surface continuously decreases.Most of the axial bearing capacity is provided by the pile side friction,and the axial bearing capacity borne by the pile tip resistance is relatively small;the pile diameter and the ultimate vertical bearing capacity of steel pipe piles conform to a non-sexual relationship.The ultimate vertical bearing capacity of a single pile increases with the increase of the pile diameter.When the pile diameter increases by 2 times,the corresponding vertical ultimate load increases by 3 times.[Conclusion]The corresponding results can provide reference for practical engineering.
作者
张强
葛畅
沈晓雷
尚进
ZHANG Qiang;GE Chang;SHEN Xiaolei;SHANG Jin(POWER CHINA HUADONG Engineering Co.,Ltd.,Hangzhou 311120,China;Zhejiang East China Engineering Consulting Co.,Ltd.,Hangzhou 311002,China;Ocean College,Zhejiang University,Zhoushan 316021,China)
出处
《南方能源建设》
2021年第3期44-50,共7页
Southern Energy Construction
基金
中国电建集团华东勘测设计研究院有限公司科技项目“江苏竹根沙(H2#)300 MW海上风电场科研项目”(AC180096Y-28-FW13)
中央高校基本科研业务费专项资金“海岛地下石油储库岩体循环弱化宏细观机制及其对围岩稳定性影响研究”(2021QNA4037)。
