逆断层作用下大口径薄壁管道安全性分析
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摘要
针对逆断层错动易导致大口径薄壁埋地管道受压发生屈曲失效的问题,基于土弹簧壳耦合模型,考虑管土材料非线性及几何非线性,分析逆断层错动作用下大口径薄壁管道的力学响应,结合大口径薄壁管道的结构特点,研究了断层位错量变化时管道截面椭圆化变形与应变分布规律。研究表明,断层位错量较大时,大口径薄壁管很快进入非线性状态;在断层错动作用下,管道不仅会产生弯曲变形,而且截面会产生椭圆化变形;大口径薄壁管抵抗逆断层压缩载荷的能力较弱,设计中应尽量避免让管道受压。研究所得结论可用于大口径薄壁管道抗灾设计与防治措施制定。
In allusion to the problem that the large-caliber and think-wall buried pipelines are invalid for buckling due to the element onlinearity of the pipeclay,through analysis on the mechanical response of large-caliber and thin-wall pipes under the condition of fault movement and by combining the structural features of large-caliber and thin-wall pipes,the laws of ovalization changes and strain distribution of pipe section in case of fault movement were studied.According to the research result,it indicates that in case of large fault movement,the large-caliber and thin-wall pipe will enter into the nonlinearity state quickly;under the function of fault movement,the pipe will be bended and deformed and the ovalization changes in section will be also caused.As the capacity of large-caliber and thin-wall pipe to resist compressive load of fault is weak,it is necessary to prevent the pipe from being compressed during the design.The research conclusions can be applied into formulating anti-disaster design and prevention measures of large-caliber and thin-wall pipe.
In allusion to the problem that the large-caliber and think-wall buried pipelines are invalid for buckling due to the element onlinearity of the pipeclay,through analysis on the mechanical response of large-caliber and thin-wall pipes under the condition of fault movement and by combining the structural features of large-caliber and thin-wall pipes,the laws of ovalization changes and strain distribution of pipe section in case of fault movement were studied.According to the research result,it indicates that in case of large fault movement,the large-caliber and thin-wall pipe will enter into the nonlinearity state quickly;under the function of fault movement,the pipe will be bended and deformed and the ovalization changes in section will be also caused.As the capacity of large-caliber and thin-wall pipe to resist compressive load of fault is weak,it is necessary to prevent the pipe from being compressed during the design.The research conclusions can be applied into formulating anti-disaster design and prevention measures of large-caliber and thin-wall pipe.
引文
[1]薛景宏,吕培培.跨断层埋地管道研究述评[J].油气田地面工程,2007,26(5)
[2]张素灵.地震断层作用下埋地管线反应分析方法的研究[D].北京:中国地震局地球物理研究所,1999
[3]Kennedy R.P,Chow A.W,Willwamson R.A.Fault movement effects on buried oil pipeline[J].Transportion Engineering,ASCE,1977(103):617-633
[4]刘爱文,胡聿贤,李小军,等.大口径埋地钢管在地震断层作用下破坏模式的研究[J].工程力学,2005,22(3)
[5]冯启民,赵林.跨越断层埋地管道屈曲分析[J].地震工程与工程振动,2001,21(4):80-87
[6]刘爱文,胡聿贤,赵凤新,等.地震断层作用下埋地管线壳有限元分析的等效边界方法[J].地震学报,2004,26(2):141-147
[7]ASCE.Guidelines For the Seismic Design of Oil and Gas Pipeline System,1983
[8]SY/T0450-1997输油(气)埋地钢质管道抗震设计规范[S]
[2]张素灵.地震断层作用下埋地管线反应分析方法的研究[D].北京:中国地震局地球物理研究所,1999
[3]Kennedy R.P,Chow A.W,Willwamson R.A.Fault movement effects on buried oil pipeline[J].Transportion Engineering,ASCE,1977(103):617-633
[4]刘爱文,胡聿贤,李小军,等.大口径埋地钢管在地震断层作用下破坏模式的研究[J].工程力学,2005,22(3)
[5]冯启民,赵林.跨越断层埋地管道屈曲分析[J].地震工程与工程振动,2001,21(4):80-87
[6]刘爱文,胡聿贤,赵凤新,等.地震断层作用下埋地管线壳有限元分析的等效边界方法[J].地震学报,2004,26(2):141-147
[7]ASCE.Guidelines For the Seismic Design of Oil and Gas Pipeline System,1983
[8]SY/T0450-1997输油(气)埋地钢质管道抗震设计规范[S]
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