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中南大学学报(自然科学版)

Journal of Central South University

第49卷    第9期    总第289期    2018年9月

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文章编号:1672-7207(2018)09-2257-07
软土地基中风机单桩基础累积侧向位移分析
胡安峰1, 2,付鹏1, 2,江进华1, 2,谢康和1, 2,李良1, 2

(1. 浙江大学 软弱土与环境土工教育部重点实验室,浙江 杭州,310058;
2. 浙江大学 滨海和城市岩土工程研究中心,浙江 杭州,310058
)

摘 要: 为研究软土地基中近海风机大直径单桩基础在长期受荷时的累积侧向变形问题,基于室内循环三轴试验,建立考虑孔压累积的软黏土刚度衰减模型。通过对ABAQUS进行二次开发,在有限元分析程序中建立刚度衰减模型,并引入门槛循环应力比对不同应力水平的土体分区计算。研究结果表明:在刚度衰减模型中采用门槛循环应力比作为是否考虑孔压累积的标准更符合真实情况;当循环荷载较小时,桩身泥面位移在一定循环次数后趋于稳定;当荷载幅值超过一定值后,桩身泥面位移迅速发展,且不再稳定;当桩基埋入深度较小时,增加桩基埋深能有效降低桩身侧向位移。

 

关键词: 单桩基础;循环荷载;刚度衰减模型;软黏土;孔压累积

Analysis of cumulative lateral displacement of monopile foundations for wind turbines in soft clay
HU Anfeng1, 2, FU Peng1, 2, JIANG Jinhua1, 2, XIE Kanghe1, 2, LI Liang1, 2

1. Key Laboratory of Soft Soils and Geoenvironmental Engineering, Ministry of Education, Zhejiang University, Hangzhou 310058, China;
2. Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China

Abstract:Based on the cyclic triaxial tests, the degradation stiffness model of soft clay considering the accumulation of pore pressure was presented to analyze the cumulative lateral displacement of large-diameter monopile foundation for offshore wind turbine under long-term cyclic loading. The degradation stiffness model was realized based on the subroutine provided by ABAQUS. And the threshold cyclic stress ratio was introduced to calculate soil by divided areas under different stresses. The results show that the application of threshold cyclic stress ratio in degradation stiffness model can help to decide whether to consider the cumulative pore pressure. The lateral displacement of monopile increases with a certain number of cycles and becomes stable when the lateral loading is relative small, but the lateral displacement develops rapidly and becomes unstable when the cyclic loading exceeds a critical value. When the pile length is short, the increase of pile length effectively reduces the lateral displacement of pipe.

 

Key words: monopile foundations; cyclic loading; degradation stiffness model; soft clay; cumulative pore pressure

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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