中俄二线管道工程多年冻土区冻害问题分析

Analysis of Frost Damage in Permafrost Regions for Second Line Project of China-Rus⁃sia Crude Oil Pipeline

中俄二线与漠大线一般地段并行敷设,地形地貌等外部自然条件基本相同。但由于多年冻土独特的工程和物理特点,在后续工程建设后,冻土情况发生了较大变化。因此,需要通过对中俄二线管道沿线冻土及漠大线建设后新出现的冰椎、冰幔、冻胀差异等冷生病害进行冻害补充调查;另外,结合冻土的热敏感性强、热稳定性差、结构易被破坏等特点,调查分析运行期间出现的问题,提出解决方案,并对典型冻土地段进行复核研究。由此保证冻土资料在中俄二线建设时的准确性,降低新工程建设以后出现冷生病害的风险,同时为冻土区管道热、应力研究及管道设计建设提供基础资料。

Second Line Project of China-Russia Crude Oil Pipeline(hereinafter referred to as"China-Russia Second Line Project")and the Mohe-Daqing Section Project of China-Russia Crude Oil Pipeline(hereinafter referred to as"Mo-Da Line Project")are laid in parallel,so the external natural conditions such as topography are similar.However,due to the special project and physical characteristics of permafrost,the condition of permafrost has changed greatly.Therefore,it is necessary to carry out a supplementary investigation on the frozen soil along with the China-Russia Second Line Project and the new frozen injuries,such as ice cone,ice mantle,and frost heave,after the construction of the Mo-Da Line Project.In addition,combined with the characteristics of permafrost such as strong thermal sensitivity,poor thermal stability,and structure easily affected,and the problems and propose solutions during the operation are analyzed.The rechecking study method is used for the typical permafrost sections,so as to ensure the accuracy of permafrost data during the construction period of China-Russia Second Project,reduce the risk of the frost damage after the construction of the project,as well as provide basic data for the study of pipeline heat and stress,and the design and construction of pipeline.