单桩竖向抗拔承载力离心模型试验研究

Centrifugal Model Test on the Vertical Uplift Bearing Capacity of Single Pile

结合某海上风电场桩基工程中的大直径超长钢管桩抗拔承载力研究,利用离心模拟技术,初步推求得出荷载-位移的关系曲线(即Q-S曲线),并与现场抗拔试验成果得出的Q-S曲线进行了比较,分析两者加载方式和加载速率的不同对Q-S曲线的影响。结果发现,上拔力的加载速率较快,求得的单桩抗拔极限承载力偏高。

To assist the design of pile foundation of an offshore wind farm, centrifuge modeling is performed to de- termine the uplift bearing capacity of single ultra-long steel pipe-pile of large diameter by which the wind turbine foundation is constituted. Curve of load versus displacement （ Q-S curve） deducted from the results of centrifuge model test are compared with that from prototype uplift capacity test. The effect of loading manner and loading rate on the ultimate uplift bearing capacity is discussed. It is shown by comparison that the value of ultimate uplift bear- ing capacity of single pile from centrifuge test is greater than that obtained from prototype test. As higher rate usual- ly mobilizes higher strength, a higher loading rate in the centrifuge model test is regarded as the cause of the differ- ence between two test results.