水平受荷桩“p-y+M-θ”分析方法  

A unified"p-y+M-q"model for laterally loaded piles considering rigidities of various piles

作　　者：王立忠[1] 赖踊卿 洪义[1,3] 张友虎[4] WANG Lizhong;LAI Yongqing;HONG Yi;ZHANG Youhu(College of Civil Engineering and Architecture,Zhejiang University,Hangzhou 310027,China;PowerChina Huadong Engineering Corporation Limited,Hangzhou 310120,China;Shanghai Institute for Advanced Study,Zhejiang University,Shanghai 200120,China;School of Civil Engineering,Southeast University,Nanjing 211189,China)

机构地区：[1]浙江大学建筑工程学院,浙江杭州310027 [2]中国电建华东勘测设计研究院有限公司,浙江杭州300120 [3]浙江大学上海高等研究院,上海200120 [4]东南大学土木工程学院,江苏南京211189

出　　处：《岩土工程学报》2024年第5期905-918,共14页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(52238001,52122906,51939010)。

摘　　要：中国近海海上风电机组开发建设中,大直径单桩基础形式使用占比超70%。现行p-y曲线设计方法主要适用于小直径柔性桩,对大直径单桩侧向及桩底受荷描述能力不足,导致其严重低估刚柔性桩和刚性桩(分别常用于中国和欧洲的近海风电工程)的变形和承载能力,过于保守的设计给海上风电降本带来挑战。为此建立了能以统一的方式预测柔性、刚柔性和刚性单桩水平单调受荷响应的“p-y+M-θ”模型,并将该模型推广到循环荷载下单桩的响应分析。通过与相关试验结果比对发现,“p-y+M-θ”模型能较为准确地预测桩基水平加载响应。力图为水平受荷单桩工程设计提供简洁而可行的响应分析方法。The large-diameter monopiles account for over 70%in construction of offshore wind turbines in China.The current p-y curve design method is primarily suitable for the small-diameter flexible piles.It has long been recognized that the method is inadequate to describe the lateral behavior of large-diameter monopiles,due to the ignorance of the soil resistances arising from base shear and base moment,which becomes more pronounced as the pile rigidity increases.Consequently,it will significantly underestimate the deformation and capacity of the semi-rigid and rigid piles(commonly used in offshore wind projects in China and Europe,respectively),bringing challenges for cost reduction.In light of these issues,the authors have proposed a“p-y+M-θ”model that aims to reasonably predict the lateral monotonic response of monopiles with a broad coverage of rigidities(or length-over-diameter ratios)in a unified way.An extension of the model is then made to enable the capability for predicting the cumulative lateral behavior under cyclic loadings.With the proposed“p-y+M-θ”model,the authors are invited by the Organizing Committee of 4th International Symposium on Offshore Geotechnical Engineering(ISFOG-2020)to participate in a blind Class-A prediction event,where the experimental data are generated from the centrifuge tests performed by University of Western Australia(UWA)on piles in soft clay under lateral monotonic and cyclic loadings.The results of some element tests for the same clay as used in the centrifuge tests are provided ahead of the Class-A prediction event,for calibrating the model parameters.All the measured responses of lateral piles under monotonic and cyclic loadings are found to be reasonably reproduced by the proposed“p-y+M-θ”model.Compared to the predictive capability of the other 28 models used by the parallel international teams participating in the prediction event,the“p-y+M-θ”model shows a leading performance in the context of monotonic and cyclic predictions.The proposed“p-y+M-θ”mo

关 键 词：软黏土 “p-y+M-θ”模型 水平受荷桩循环加载 试验结果对比 

分 类 号：TU473[建筑科学—结构工程]