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高桩承台基础是我国未来一段时间内软土海床地基上近海风电机组的主要基础型式,复杂荷载计算及其作用下基础的受力和变形分析及承载力确定是近海风电机组群桩基础设计需解决的关键问题。针对我国近海常见的深厚软粘土海床地基,分析了近海风电机组群桩基础的典型最不利荷载组合,采用软粘土地基中桩基新型双曲线型p-y曲线模型及API规范t-z曲线模型和q-z曲线模型,建立了顶部三向复杂荷载作用下群桩高承台的受力和变形分析模型。进而针对群桩基础的主要设计参数,包括桩基埋深、桩径、群桩圆周直径及桩的倾斜度等,进行了优化分析,发现:在满足上拔和下压承载力要求的前提下桩长对群桩内力和变形影响不大,桩基倾斜度大对群桩内力和变形均较为有利,增加群桩圆周直径对控制桩基变形影响不大,但可有效降低桩身轴力。
Pile foundation of high pile is the main foundation of offshore wind turbines on the soft seabed foundation in some time in the future. The calculation of complex loads and the analysis of the bearing and deformation of the foundation and the determination of bearing capacity are the foundation of pile groups of offshore wind turbines Design to solve the key issues. Aiming at the deep soft clay seabed foundation commonly found in offshore China, the typical combination of the most unfavorable load for offshore wind turbine group pile foundation is analyzed. The new hyperbolic py curve model of pile foundation in soft clay foundation and the API specification tz curve model and qz curve Model, the force and deformation analysis model of pile cap pile caps with high top three-way complex load is established. Furthermore, the main design parameters of pile foundation, including pile foundation depth, pile diameter, pile group circumference diameter and pile inclination, are optimized and analyzed. It is found that under the premise of meeting the requirements of bearing capacity The pile length has little effect on the internal forces and deformations of the pile groups. Large pile inclination is more beneficial to the internal forces and deformations of the pile groups. Increasing the circumferential diameter of the pile groups has little effect on the deformation of the pile, but can effectively reduce the axial force of the pile.