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

作　　者：周素静[1] 张艳[2] 王栋 ZHOU Su-jing;ZHANG Yan;WANG Dong(Zhengzhou Railway Vocational and Technical College,Zhengzhou 451460,China;College of Environmental Science and Engineering,Ocean University of China,Qingdao 266100,China)

机构地区：[1]郑州铁路职业技术学院,河南郑州451460 [2]中国海洋大学环境科学与工程学院,山东青岛266100

出　　处：《海洋通报》2019年第6期727-732,共6页Marine Science Bulletin

基　　金：国家自然科学基金（41772294）;河南省教育科学研究规划项目（[2018]-JKGHYB-0472）

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。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.

关 键 词：管汇 负压沉箱 承载力 有限元 黏土 

分 类 号：P756.2[天文地球—海洋科学]