针对风机运行期间所受荷载的复杂性，依托威海某风电机组基础加固项目，提出一种系统监测方法，结合现场环境评估加固基础的性能提升效果。从施工阶段到运行阶段，采集加固基础的塔筒应变、焊钉应变以及锚索轴力等，研究风机加固基础在不同工况下的受力响应及相关性分析，探讨基础加固后的性能提升效果及荷载传递机理。研究结果表明：加固区中各构件受力响应具有趋势相似性与幅值差异性，受力改善效果明显且均具有较大的安全度；该加固方法利用外包混凝土和焊接焊钉改变了结构受力边界，增加底层塔筒的约束刚度，使上部传递荷载重新分配，分担传递剪力，保证塔筒与混凝土共同变形。基于此加固方案下提出的系统监测评估方法，可以有效、及时地掌握加固系统各构件的受力状态，保证后续风电机组运行安全；该加固方案改善了基础、岩石锚杆和法兰的受力状态，基础整体受力性能得到保证，为后续风电机组基础优化工程提供了一定的参考。

The load on the wind turbine during operation is complex. Therefore, based on a wind turbine foundation reinforcement project in Weihai, a system monitoring method is proposed to evaluate the performance improvement effect of the reinforced foundation in combination with the field environment. From the construction stage to the operation stage, the tower strain, welding stud strain and anchor cable axial force of the reinforced foundation are collected to study the stress response and correlation analysis of the wind turbine reinforced foundation under different working conditions, and to explore the performance improvement effect and load transfer mechanism after foundation reinforcement. The results show that the stress response of each component in the reinforcement area has trend similarity and amplitude difference, and the stress improvement effect is obvious and has great safety. The reinforcement method changes the stress boundary of the structure by outsourcing concrete and welding studs, increases the restraint stiffness of the bottom tower, redistributes the upper transfer load, shares the transfer shear force, and ensures the common deformation of the tower and concrete.The system monitoring and evaluation method based on this reinforcement scheme can effectively and timely grasp the stress state of each component of the reinforcement system and ensure the safety of the subsequent wind turbine operation. The reinforcement scheme improves the stress state of the foundation, rock bolt and flange, and the overall mechanical performance of the foundation is guaranteed, which provides a certain reference for the subsequent wind turbine foundation optimization project.

TU476

山东省自然科学基金资助项目(ZR2019MEE021)