摘要
多年冻土区运营的油气管道的地基土冻胀融沉容易引起管道的屈曲变形,严重影响管道的安全稳定。以大兴安岭多年冻土区中俄原油管道沿线4种典型的管道地基土为研究对象,通过冻胀、融沉试验分析了各种土样的融沉系数、冻胀率与其影响因素之间的关系,采用灰色关联度法对融沉系数、冻胀率影响因素的敏感性进行了分析。结果表明:试验土样的融沉系数和冻胀率受含水率、干密度等因素影响较大,超塑含水率、含泥量及烧失量对粉土、砂土及泥炭化土亦有显著影响。通过灰色关联度分析可知,含水率虽是冻胀、融沉的最主要影响因素,但并非绝对,对于有的土质其含泥量与超塑含水率起主要作用,设计施工时需要高度重视。研究结果可为多年冻土区埋地管道的设计、施工、运营维护以及冻害防治提供科学依据与理论参考。
For the oil and gas pipeline operating in the permafrost regions,buckling deformation is usually caused by frost heaving and thaw settlement of the foundation soil,which affects the safety and stability of pipeline seriously.With 4 typical types of pipeline foundation soil along China–Russia Eastern Gas Pipeline located in the permafrost region of Greater Khingan Range as the object of study,the relationship of the coefficient of thaw settlement and frost heaving ratio with other influencing factors of various soil samples was analyzed through the frost heaving test and thaw settlement test,and the sensitivity of the influencing factors of the coefficient of thaw settlement and frost heaving ratio was also analyzed with gray correlation method.The results indicate that the coefficient of thaw settlement and frost-heaving ratio of the soil samples are greatly influenced by water content and dry density.In addition,superplastic water content,mud content and loss on ignition also have significant effect on the silty soil,sandy soil and peat soil.According to the grey correlation analysis,water content is the main influencing factor of frost heaving and thaw settlement,but it is not absolute.For some soil,the mud content and superplastic water content may play a major role in frost heaving and thaw settlement,to which great attention shall be paid during design and construction.The study results can provide scientific support and theoretical reference to the design,construction,operation,maintenance and prevention and control of frost damage of buried pipelines in the permafrost regions.
作者
王伟
杜文友
唐艳刚
夏炜燕
刘华南
吕岩
WANG Wei;DU Wenyou;TANG Yangang;XIA Weiyan;LIU Huanan;LYU Yan(School of Prospecting and Surveying,Changchun Institute of Technology//Jilin Laboratory for Oil Shale Drilling and Environmental Protection Engineering;Daqing(Jiagedaqi)Oil&Gas Transportation Sub-Company,PetroChina Pipeline Company;College of Construction Engineering,Jilin University)
出处
《油气储运》
CAS
北大核心
2020年第10期1155-1164,共10页
Oil & Gas Storage and Transportation
基金
国家自然科学基金资助项目“季冻区沼泽草炭土冻胀机理研究”,41502272
吉林省教育厅“十三·五”科研规划项目“基坑水平冻胀力分布规律研究”,JJKH20191243K
长春工程学院种子基金资助项目“大兴安岭多年冻土区浅埋式管道冻融循环效应研究”,320160017
长春工程学院主题基金资助项目“冻土区油气管道管土相互作用机制研究”,320200054。
关键词
多年冻土
融沉系数
冻胀率
影响因素
灰色关联度分析
permafrost
coefficient of thaw settlement
frost heaving ratio
influencing factors
grey correlation analysis
