摘要
长输油气管道极易受到多种地质灾害影响,容易造成管道暴露、悬空,甚至断裂,严重威胁管道的安全。由于管道的失效过程受多种不确定性因素影响,因此,研究地质灾害作用下悬空管道的失效风险对管道的安全可靠运行具有重要的现实意义。为此,以黄土湿陷灾害为例,采用弹性地基梁模型对黄土湿陷作用下的悬空管道进行了受力分析,并基于信息熵理论提出了应变能熵的概念,建立了管道失效概率评价模型,得到了管道失效概率与黄土湿陷深度之间的关系,同时探讨了黄土湿陷长度与管道内压的变化对管道失效概率的影响。结果表明:1管道应变能熵能够全面反映管道在外力作用下的安全状态并能够对管道的失效风险进行定量评价;2与黄土湿陷后管道悬空长度相比,管道内压的变化对失效概率的影响相对较小,降低黄土湿陷后管道的悬跨长度可以大幅度降低管道的失效概率。
Long distance gas and oil pipelines are highly vulnerable to geological disasters which will lead to the pipe exposure,suspended or even fracture and threat to the pipeline safety.The failure process of the pipeline is affected by many uncertainties,thus,researching the failure risk of suspended pipelines will be helpful to the safety and reliability of the pipelines.In this study,loess collapse was used as a typical type of geological disaster and elastic foundation beam model was used to analyse the suspended pipelines under the stress of loess collapse.The study put forward the concept of strain energy entropy and then established the failure probability model based on information entropy theory.With this model,the study revealed the relationship between pipeline failure probability and depth of loess collapse,and the influence of the change of the suspended length and the pipeline pressure on the pipeline failure probability,as well.The results show that the curve of the relationship between strain energy entropy and load can reflect the security state of pipelines,which makes it possible for quantitative evaluation of the pipeline failure risk.Compared with the change of suspended length,the pipeline pressure has little effect on failure probability,and thus,failure probability can be reduced substantially by shortening the suspended length.
出处
《地质科技情报》
CAS
CSCD
北大核心
2016年第2期90-94,共5页
Geological Science and Technology Information
基金
中国石油天然气与管道分公司课题"油气管道黄土湿陷性危害评价及防护技术研究"(2013B-3410-0510)
关键词
信息熵
油气管道
悬空管道
弹性地基梁
应变能熵
information entropy
oil ＆ gas pipeline
suspended pipeline
elastic foundation beam
strain energy entropy
作者简介
谭东杰（1964-），男，高级工程师，主要从事管道泄漏监测和管道安全预警技术研究及应用推广工作。E—mail：tdj@petrochina．com．cn
通信作者：白路遥（1986-），男，工程师，主要从事油气管道地质灾害防护技术研究。E-mail：bailuyao@petrochina．com．cn
