为快速计算海上风力机桩桶复合基础的荷载响应,基于PISA单桩设计法,将三维桶简化为一维梁附加到单桩上,通过在4条描述桩土相互作用的土反应曲线上增加2条描述桶土相互作用的土反应曲线,建立海上风力机桩桶复合基础一维（1D）简化设计模型,并与已有离心机试验结果进行比较,验证模型的准确性;在此基础上通过对桶深内的土反应曲线进行折减,计算循环荷载作用下桩桶复合基础的动力响应,并对该方法的适用性进行探讨。结果表明：在校准空间内,1D设计模型计算效率高,精度接近3D数值模型,在实际工况条件下,1D设计模型能准确预测桩桶复合基础的循环荷载响应。该研究成果可为海上风力机桩桶复合基础设计提供理论指导。
Abstract
To quickly calculate the load response of hybrid pile-bucket foundation for offshore wind turbine, based on the PISA （pile soil analysis） monopile design method, the three-dimensional bucket is simplified as a one-dimensional beam attached to the monopile. By adding two soil reaction curves describing bucket-soil interaction to four soil reaction curves describing pile-soil interaction, a one-dimensional （1D） simplified design model of hybrid pile-bucket foundation for offshore wind turbine is established, and the accuracy of the model is verified by comparing it with the existing centrifuge model test results. On this basis, the dynamic response of hybrid pile-bucket foundation under cyclic loads is calculated by applying reduction factors to the soil reaction curves within the bucket depth, and the applicability of this method is discussed. The results show that within the calibration space, the 1D design model has high computational efficiency and accuracy close to the 3D numerical model. Under actual working conditions, the 1D design model can accurately predict the cyclic load response of hybrid pile-bucket foundation. This study can provide theoretical guidance for the design of hybrid pile-bucket foundation for offshore wind turbine.
关键词
海上风力机 /
数值分析 /
循环荷载 /
桩桶复合基础 /
1D设计模型
Key words
offshore wind turbines /
numerical analysis /
cyclic load /
hybrid pile-bucket foundation /
1D design model
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基金
浙江省科技计划项目“尖兵领雁+X”研发攻关计划（2024C03031）; 国家自然科学基金（52271294; 52378376）; 浙江省属高校基本科研业务费项目-科技类（RF-B2023007）
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