软黏土大直径单桩水平循环加载离心机模型试验  

Centrifugal model tests on lateral cyclic loading behavior of large-diameter monopiles in soft clay

作　　者：高鲁超 戴国亮[3] 张继生 万志辉 姚中原 王洋 GAO Lu-chao;DAI Guo-liang;ZHANG Ji-sheng;WAN Zhi-hui;YAO Zhong-yuan;WANG Yang(Clean Energy Branch,Huaneng International Power Jiangsu Energy Development Co.,Ltd.,Nanjing,Jiangsu 210003,China;Key Laboratory of Ministry of Education for Coastal Disaster and Protection,Hohai University,Nanjing,Jiangsu 210098,China;School of Civil Engineering,Southeast University,Nanjing,Jiangsu 211189,China;School of Transportation Engineering,Nanjing Tech University,Nanjing,Jiangsu 211816,China;School of Civil Engineering and Geomatics,Shandong University of Technology,Zibo,Shandong 255000,China)

机构地区：[1]华能国际电力江苏能源开发有限公司清洁能源分公司,江苏南京210003 [2]河海大学海岸灾害及防护教育部重点实验室,江苏南京210098 [3]东南大学土木工程学院,江苏南京211189 [4]南京工业大学交通运输工程学院,江苏南京211816 [5]山东理工大学建筑工程与空间信息学院,山东淄博255000

出　　处：《岩土力学》2024年第8期2411-2420,共10页Rock and Soil Mechanics

基　　金：国家自然科学基金(No.52078128,No.52008100);海岸灾害及防护教育部重点实验室(河海大学)开放基金(No.202303);中国博士后科学基金(No.2022M723534)。

摘　　要：为研究软黏土中大直径单桩水平循环受荷响应,开展了不同循环加载形式(单向和双向)下软黏土中大直径单桩离心模型试验,对比分析了大直径单桩变形特性、刚度弱化、桩身弯矩、循环p-y曲线以及桩周孔隙水压力变化规律。试验结果表明:单桩荷载-位移曲线表现出明显的非线性滞回耗能与位移累积特性,相比单向循环,双向循环引起桩顶产生较大的累积位移,累积位移与循环次数和加载幅值有关;桩顶累积位移由可恢复的弹性变形和不可恢复的塑性变形组成,塑性变形与循环次数和加载应力水平有关;双向循环荷载造成桩顶刚度弱化明显,引起桩身产生更大的弯曲效应;桩周孔压累积与循环次数和加载幅值有关,双向循环下桩周孔压累积更为显著。To study the lateral cyclic loading response of large-diameter monopiles in soft clay,the centrifugal model tests of large-diameter monopiles in soft clay under different cyclic loading forms(one-way and two-way)were carried out.The deformation characteristics of large-diameter monopiles,stiffness weakening,bending moment,cyclic p-y curves and excess pore-water pressure were relatively analyzed.The test results show that the load-displacement curves show obvious nonlinear retardation energy consumption and displacement accumulation properties.Compared with the one-way cycle loading,the two-way cycle loading causes a significant cumulative displacement,which is influenced by both the number of cycles and the loading amplitude.The cumulative displacement consists of recoverable elastic deformation and unrecoverable plastic deformation,which is related to the number of cycles and loading stress level.The two-way cycle loading causes the weakening of pile-top stiffness,thereby enhancing the bending effect of the pile.The accumulation of excess pore-water pressure is related to the cycle number and loading amplitude,with a more pronounced effect observed under two-way loading conditions.

关 键 词：海上风电 桩基础 循环荷载 软黏土 离心机试验 

分 类 号：TU470[建筑科学—结构工程]