近海风电筒型基础层状土中吸力下沉调平技术研究

Bucket foundation is a promising environmental friendly foundation for offshore wind turbines. How to effectively penetrating foundations to design depth with satisfied levelness, avoiding soil plug heave inside the bucket and deformation or buckling of skirt and compartment plates during suction installation are key problems for the usage of bucket foundation. The response modes of soil plug inside the bucket and critical suction calculation, penetration and adjustment without buckling failure, and reducing penetration resistance technique and optimizing bucket lid design in layered soils during suction installation are the main researching contents in order to perform the system analysis for the instability mechanism of multi-bucket/compartment bucket foundation during installation. As a result, the construction safety conditions, computational formula of penetration resistance, control method for applying suction and avoiding deformation and buckling, and resistance reduction technology will be proposed so that the bucket foundation for offshore wind turbines can be used widely.

筒型基础是一种极具潜力的环境友好型海上风电基础。如何有效的实现筒型基础顺利下沉到设计深度和下沉过程结构垂直度的精准控制，避免筒内土塞隆起或筒裙及分舱板变形甚至屈曲带来的安装风险是筒型基础应用层面亟待解决的问题。本项目拟通过开展层状土中多筒/多舱型筒型基础筒内土塞响应模式及施工临界吸力研究、下沉精细调平技术和屈曲失效问题研究和下沉减阻技术与筒顶优化设计研究，系统分析多筒/多舱型筒型基础施工过程可能发生的不稳定性态发生机理，提出施工安全边界条件，完善多筒/多舱型筒型基础下沉阻力计算公式，提出下沉调平吸力施加和结构变形/屈曲控制方法和辅助减阻技术，助力海上风电筒型基础规模化应用。

筒型基础是一种极具潜力的环境友好型海上风电基础。本项研究面向筒型基础应用层面亟待解决的一个问题：如何有效的实现筒型基础顺利下沉到设计深度和下沉过程结构垂直度的精准控制，避免筒内土塞隆起或筒裙及分舱板变形甚至屈曲带来的安装风险。通过多比尺的模型试验、数值模拟和理论分析，以及现场的监测数据分析，系统开展了多筒/多舱型筒型基础筒内土塞响应模式及施工临界吸力研究、下沉精细调平技术和屈曲失效问题研究和下沉减阻技术与筒顶优化设计研究，深入分析了多筒/多舱型筒型基础施工过程可能发生的不稳定性态发生机理，提出了施工安全边界条件，完善多筒/多舱型筒型基础下沉阻力计算公式，形成了下沉调平吸力施加和结构变形/屈曲控制方法和辅助减阻技术，指导了相关海上风电多筒/多舱型筒型基础的工程应用。