由于各种自然灾害和人为作用，可能会导致长距离油气输送管道发生沉降变形，因此对庞大的油气输送管网进行监测，及时发现情况，可以预防事故发生，保证生产生活的正常进行。提出了长输管道沉降变形分布式监测方法。该方法利用先进的分布式光纤传感技术对管道应变进行实时监测，利用梁大变形理论中应变与挠度的关系，采用数值计算方法得到管道的挠度值。该方法能够更加直观形象地分析计算管道的变形情况，为长输管道的安全运行提供保障。

The long-distance pipeline would have subsidence deformation for the sake of natural disasters and artificial processes. Thus, monitoring the huge oil and gas transport pipeline system could discover abnormity instance without delay and prevent accidents to ensure the production and life. The distributed monitoring method of subsidence deformation of long-distance pipeline, presented in this paper, uses advanced distributed optical fiber sensing technology to monitor pipelines strain in real-time. According to the relationship between strain and deflection in beams large deformation theory, the deflection of pipeline could be calculated with numerical method. This monitoring method could analyze pipes deformation more intuitively and vividly to provide safety for long-distance pipeline.