摘要
地面沉降是我国常见的地质灾害,地面沉降后会挤压埋地燃气管道,严重威胁管道的安全运行。为研究地面沉降对管道造成的影响,基于埋有燃气管道地面的沉降现状,分析埋地燃气管道受力特征,修正管道力学理论计算模型,开展了地面沉降下的埋地燃气管道数值模拟,对管道应力计算结果和数值模拟结果进行了对比分析。研究结果表明,管道的受力与沉降区域、土体黏聚力和管道壁厚相关。在管道受力未超过材料屈服强度时,修正后的力学模型计算结果与数值模拟结果较吻合;而在管道受力超过屈服应力时,模型计算与数值模拟结果不再吻合,建议采取基于应变的管道破坏准则对管道应力进行计算。研究成果为埋有燃气管道沉降地面的处理提供了有效的理论依据和模型支撑,对于保障地面沉降下燃气管道安全、稳定运行具有重要意义。
Land subsidence is a common geological disaster in China.The occurrence of land subsidence will squeeze the buried gas pipeline and seriously threaten the safe operation of the pipeline.In order to study the impact of land subsidence on pipelines,based on the settlement status of the land buried with gas pipeline,the stress characteristics of buried gas pipelines are analyzed,the theoretical calculation model of pipeline mechanics is modified,and the numerical simulation of buried gas pipelines under land subsidence is carried out.The results of pipeline stress calculation and numerical simulation are compared and analyzed.Study results show that the stress of pipeline is related to settlement area,soil cohesion,and the wall thickness of the pipeline.When the stress of the pipeline does not exceed the yield strength of the material,the calculated results of the modified mechanical model are in good agreement with the data simulation results,but when the stress of the pipeline exceeds the yield stress,the results of model calculation and data simulation are not consistent.Thus,the strain-based failure criterion is recommended to adopt to calculate the stress of pipeline.The research results provide an effective theoretical basis and model support for the treatment of subsidence land buried with gas pipelines,which is of great significance to ensure the safe,and stable operation of gas pipelines under land subsidence.
作者
张浩
吕达
陈飞
宋家才
韩金柯
张宇
孙明源
刘鹏
范佳林
ZHANG Hao;LYU Da;CHEN Fei;SONG Jiacai;HAN Jinke;ZHANG Yu;SUN Mingyuan;LIU Peng;FAN Jialin(Shenzhen Gas Group Co.,Ltd.;College of Pipeline and Civil Engineering,China University of Petroleum(East China))
出处
《油气田地面工程》
2022年第11期71-79,共9页
Oil-Gas Field Surface Engineering
关键词
埋地燃气管道
应力
地面沉降
数值模拟
特征分析
管道破坏准则
buried gas pipeline
land subsidence
stress
numerical simulation
characteristic analysis
pipeline failure criterion
