海上风电桩基础竖向承载力循环弱化简化分析  

Simplified analysis of cyclic degradation of axial bearing capacity for offshore wind turbine pile foundations

作　　者：刘莹[1,2] 黄茂松[1,2] 李帅[3] 

机构地区：[1]同济大学岩土及地下工程教育部重点实验室,上海200092 [2]同济大学地下建筑与工程系,上海200092 [3]机械工业信息研究院,北京100037

出　　处：《岩土力学》2013年第9期2655-2660,共6页Rock and Soil Mechanics

基　　金：教育部博士点基金项目(No.20110072110008)

摘　　要：提出了一个考虑循环衰减作用的软黏土弹塑性损伤弱化模型,在此模型基础上建立了一个基于剪切位移法的单桩竖向承载力简化计算方法,并利用大型有限元软件进行了不同循环荷载水平下单桩竖向承载力的计算。为了证明简化方法的准确性与有效性,将计算结果与有限元计算结果进行对比,二者的吻合度较高。先期循环荷载能引起单桩竖向承载力弱化,并且弱化程度随先期循环荷载水平的增加而增加。最后将简化方法应用于某海上风电场桩基础承载力的计算中,结果表明,提出的简化方法可应用于实际工程问题的分析。A modified undrained elastic-plastic model considering the cyclic degradation of clay soil is proposed. Based on this model, a simplified analysis procedure based on shear displacement method is presented. Numerical simulations for axial bearing capacity of single pile are conducted by commercially available finite element software at different cyclic load levels. The results calculated by this simplified analysis have a good consistency and effectiveness with the results from finite element analysis. The axial bearing capacity of single pile will be degraded after resisting cyclic loading, and the degradation will be greater as the increase of cyclic loading levels. As an example, the axial bearing capacities of pile foundation of an offshore wind farm are studied with the application of the proposed simplified analysis method. The proposed simplified calculation method will serve as a useful tool for engineering design.

关 键 词：循环弱化 单桩竖向承载力 简化分析方法 海上风机桩基础 

分 类 号：TU473[建筑科学—结构工程]