台风作用下岩基海床海上风机高桩承台支撑系统的振动与倾斜监测研究

Study On Typhoon-induced Vibration and Tilt Monitoring of Offshore Wind Turbine High-Rise-Pile-Cap Supporting System For Batholith Seabed

本文以福建海域首个海上风电工程项目为依托，针对其海底花岗岩底质，设计了一套监视高桩承台支撑系统承台和塔筒振动和倾斜的状态监测系统，并在台风登陆期间成功取得了相应状态数据。通过分析发现，台风对风机振动和瞬态倾斜影响较大。但是，海上风力发电机组支撑系统的I阶固有频率没有发生大的变化，风机未产生永久倾斜，说明台风影响期间风机支撑系统未发生严重的结构失效现象。台风作用期间，嵌岩桩风机的振动加速度幅值、振动烈度、最大有效倾角都比摩擦桩风机要小。由此推测从振动和倾斜特性来说高桩承台嵌岩桩基础的表现要由于高桩承台摩擦桩基础。

This paper introduces the design and development of a vibration and tilt monitoring system for offshore wind turbine high-rise-pile-cap supporting system, which is used in the first offshore wind power project in Fujian area with batholith seabed. This system successfully collected the vibration and tilt status data under the influence of Typhoon ＂Meranti＂ in 2016. Through data analysis, it is found that typhoon affects the vibration and instantaneous tilt of the supporting system greatly, but its 1^st natural frequency changes very small, and it does not produce any permanent inclination, indicating that there is no serious structural failure happened under the influence of typhoon. During the typhoon period, the amplitude of vibration acceleration, vibration intensity, and maximum effective inclination of high-rise-pile-cap supporting system with rock socketed piles are smaller than those of high- rise-pile-cap supporting system with friction piles, indicating that the performance of high-rise-pile-cap supporting system with rock socketed piles is better than that of high-rise-pile-cap supporting system with friction piles from the perspective of vibration and tilt.