三向复杂荷载作用下近海风机群桩基础参数分析与优化  

Parameter Analysis and Optimization of Pile Group Foundations for Offshore Wind Turbines under Three-Direction Complex Load

作　　者：郭俊科[1] 方伟定[1] 

机构地区：[1]浙江省电力设计院,杭州市310012

出　　处：《电力建设》2013年第5期66-70,共5页Electric Power Construction

摘　　要：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 group foundations with elevated piles will be one of the most popular foundation types on soft clay for offshore wind turbines in the next few years in China. The calculation of complex load, the analysis on foundations＇ mechanical behaviors and deformation mechanisms, as well as the determination of foundation bearing capacity under complex load are the key problems that should be solved urgently for the design of pile group foundations of offshore wind turbine. Aimed to the common deep soft clay in the offshore area in China, the most unfavorable typical load combination for pile group foundations of offshore wind turbine was analyzed. By using new hyperbolic p - y curve model of pile foundation in soft clay, t - z curve model and q - z curve model in API code, an internal force and deformation analytical model on elevated piles was established under three-direction complex load. Then, optimization analysis on the main parameters, i.e. embedment and diameter of pile, circle diameter of pile cap and inclination of pile, was investigated. The results show that the effect of pile length on internal force and deformation of pile group is not significant but it is benefit to increase the inclination of pile when the pile＇ uplift resistance and compression capacity meet the requirements; though the influence of pile group＇s circle diameter increase on pile deformation controlling is little, it can effectively reduce the pile axial force.

关 键 词：海上风电场 风电机组 群桩基础 承载力 变形 

分 类 号：TK83[动力工程及工程热物理—流体机械及工程]