多年冻土区输油管道周围融化圈发展过程的数值模拟计算方法

Numerical Simulation Method for Development Process of Melting Ring around Oil Pipeline in Permafrost Regions

为减少对环境破坏,中俄原油管道二线工程与在役中俄原油管道漠河—大庆段工程管道一般地段并行10 m敷设,穿越约450 km的多年冻土区。冻土的水热状态变化将直接影响到其物理力学特性,进而对管道整体稳定性和结构完整性产生威胁。因此,需要采取相应的设计措施,保证中俄管道安全运行。中俄原油管道二线工程设计前期,在总结中俄原油管道漠河—大庆段工程冻土研究经验的基础上,使用预测管道运营中产生的融沉变形的模拟计算方法,计算了沿线管道周围冻土热状况的变化和可能产生的管道变形,为管道埋设方法、管壁厚度选取以及采取防护措施等提供了合理的设计参数。

In order to decrease the damage to the environment,the second line of the China-Russia Crude Oil Pipeline Project and the pipeline of the Mohe-Daqing Section of the China-Russia Crude Oil Pipeline Project in service are laid in parallel for 10 m,crossing about 450 km of permafrost area.The change of hydrothermal state of frozen soil will directly affect the physical and mechanical properties of frozen soil,and then threaten the overall stability and structural integrity of pipelines.Therefore,corresponding design measures should be taken to ensure the safe operation of the China-Russia Crude Oil Pipeline.In the early stage of the second China-Russia Crude Oil Pipeline,and on the basis of summing up the research experience of frozen soil in the Mohe-Daqing Section of China-Russia Crude Oil Pipeline Project,the simulated calculation method is used to predict the melting and thawing deformation in pipeline operation,the changes of the thermal condition of frozen soil around the pipeline along the route and the possible deformation of the pipeline are calculated,which provides reasonable design parameters for the method of pipeline embedding,the thickness selection of the pipe wall and the protection measures.