周素静,张艳,王栋.海底管道沉箱基础的复合承载力包络面研究[J].海洋通报,2019,(6):727-733
海底管道沉箱基础的复合承载力包络面研究
Capacity envelope of caisson foundation for on-bottom pipelines
投稿时间:2018-12-26  修订日期:2019-04-02
DOI:
中文关键词:  管汇  负压沉箱  承载力  有限元  黏土
英文关键词:manifold  suction caisson  bearing capacity  finite elements  clay
基金项目:国家自然科学基金 (41772294);河南省教育科学研究规划项目 ([2018] 原JKGHYB-0472)
作者单位E-mail
周素静 郑州铁路职业技术学院河南 郑州 451460 z_s_j2003@163.com 
张艳 中国海洋大学 环境科学与工程学院山东 青岛 266100  
王栋 中国海洋大学 环境科学与工程学院山东 青岛 266100 dongwang@ouc.edu.cn 
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中文摘要:
      当负压沉箱被用作深水管汇或管道终端基础时,其长径比常介于 1~2之间,而目前的沉箱复合承载力包络面表达式大都针对长径比不超过 1的情况,少数覆盖长径比大于 1的研究又不适用于土体表层强度非零的情况。采用有限元方法,模 拟竖向力、水平力和弯矩共同作用下沉箱基础的响应,采用 Probe加载模式获得沉箱的复合承载力包络面。进行大量变动参数分析,针对长径比为 1~2的沉箱,讨论了长径比和土体强度分布对单向承载力和包络面的影响,并给出了预测沉箱复合承载力的归一化表达式
英文摘要:
      When they areused to support manifolds and terminals of pipelines in deep waters, the suction caissons are usually with length to diameter ratios of 1~2. However, most existing equations of capacity envelopes for suction caissons are in terms of length to diameter ratios less than 1, while few equations for the ratio larger than 1 cannot be used for soil with nonzero undrained strength at mudline. A large number of finite element analyses were conducted to study the response of caissons under combined vertical force, horizontal force and moment, with the probe loading approach used to obtain the capacity envelopes. For suction caissons with length to diameter ratio of 1~2, the influences of the length to diameter ratio and the soil strength profile on the uniaxial capacities and envelopes under combined loading conditions were explored through parametric study, and a normalized equation of capacity envelope was further provided.
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