摘要
为保障天然气管道安全运行,减少天然气管道发生第三方破坏泄漏带来的严重危害,提高破损管道的防控力度,通过经典赫兹接触理论,采用有限元仿真软件,建立第三方挖掘机斗齿作用管道的数值模型,研究了不同斗齿冲击角度和冲击深度对管道的损伤程度。结果表明:随着挖掘机斗齿吃入深度增大,管道内外壁面的变形越大,卸载内压后管道凹坑变形更加明显。基于输气管道残余应力研究分析,考虑凹坑深度及应力综合评价,对破损管道进行了系统分析。结论以管道应变的6%为临界值,管道外表面凹坑深度的最大值为参考,给出破损管道更换的评价标准。最后,对某管段施工过程中挖掘机斗齿的影响进行了风险评价分析,为实际现场输气管道第三方破坏的风险防控预案提供科学依据。
To ensure safe operation of natural gas pipelines,reduce serious damage caused by third-party operation and leakage of pipelines,and improve the prevention and control of damaged pipelines,a numerical model of bucket teeth action on pipeline was established based on the classical Hertz contact theory and ANSYS finite element methods(FEM),and the damage degree of bucket teeth impact at different angles and depths at pipeline were analyzed.The results show that deformation of inner and outer walls of the pipeline increase with the increase of the tooth depth of excavator,and the pit deformation of the pipeline was more obvious after the internal pressure was released.In addition,the residual stress of gas pipeline was analyzed and comprehensive evaluation of pit depth and stress was conducted.It was found that the critical value of pipeline strain was 6%.Therefore,the maximum pit depth on the outer surface of pipeline shall be taken as a reference to establish evaluation standards of damaged pipeline repair and replacement.At last,the risk assessment on the influence of bucket teeth of excavator during pipelining shall be performed to provide a scientific basis for the risk reduction and control over the third-party damage of on-site gas pipeline.
作者
黄雪松
张佳
周兆明
谭金松
HUANG Xue-song;ZHANG Jia;ZHOU Zhao-ming;TAN Jin-song(Petroleum Engineering Technology Research Institute,SINOPEC Zhongyuan Oilfield Company,Puyang 457000,China;College of Mechanical and Electrical Engineering,Southwest Petroleum University,Chengdu 610500,China)
出处
《科学技术与工程》
北大核心
2020年第1期320-326,共7页
Science Technology and Engineering
基金
石油天然气装备教育部重点实验室项目(OGE201702-25)
国家自然科学基金(51504207)
国家科技重大专项(2016ZX05017-004)
关键词
输气管道
第三方破坏
风险评价
应力应变
仿真分析
gas pipeline
third party damage
safety evaluation repair
replacement stress strain
simulation analysis
