基于BOTDR的海上风力发电机桩基水平荷载性能研究

Horizontal Load Test on Offshore Wind Turbine Pile Foundation Based on BOTDR

随着海上风力发电技术的发展,风力发电机的功率不断增大,对其桩基的承载力要求也不断提高,因此需要测试桩基的荷载性能来验证工程设计的安全可靠性。首先搭建了1 m空间分辨率的布里渊光时域反射(BOTDR)系统,在杭州湾嘉兴市海域的风电项目中,利用该系统对海上风力发电机桩基进行了水平推力加载试验。通过测量和分析不同水平荷载下桩基的应变分布和最大应变位置,得到了其形变情况和位移分布。结果表明,该桩基的水平承载力达到了预期设计的最大荷载700 kN,验证了BOTDR分布式光纤传感技术在海上风力发电机桩基检测中的有效性。

With the development of offshore wind power generation technology, the powers of wind turbines are increasing, leading to higher demands for the bearing capacity of their pile foundations. Thus, load performance test on pile foundations is needed to ensure the safety and reliability of engineering design. In this study, we first established a Brillouin optical time-domain reflectometry(BOTDR) system with a spatial resolution of 1 m. Then, this system was used to conduct horizontal thrust-loading tests on the pile foundation of an offshore wind turbine in the Jiaxing region of Hangzhou Bay. The deformation and displacement distributions of the pile foundation were determined by measuring and analyzing the strain distributions and positions of the maximum strain of the pile foundation under different horizontal loads. Results show that the horizontal bearing capacity of the tested pile foundation can withstand the expected maximum load of 700 kN, and the BOTDR distributed optical fiber sensing technology in pile foundation tests for offshore wind turbines is validated.