沼泽地段输气管道应力校核及安全性分析
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摘要
输气管道穿越沼泽地低洼地带,在自然下沉或浮力的作用下,易发生变形破坏。因此,需要在设计阶段对沼泽地段的管道进行应力和位移分析。本文根据某区管道的设计资料,建立了相应的应力分析模型,首次采用CAESAR II软件对沼泽地段输气管道进行了数值模拟。结果表明:对于下沉的管道,沉降量在5cm~10cm范围内时,沉降量对管道应力的影响较大(沉降量每增加1cm,应力值增大约30MPa),最高及次高应力均产生在过渡段与沼泽地段的交界处;对于上浮的管道,管道最大应力产生在管道过渡段,而不是沼泽地段。说明对于上浮管道,水浮力的作用可以降低过渡段与沼泽地段交界处的集中应力,且偶然载荷工况下的应力值最高,所以工程中建议:若管道处于上浮状态应重点对偶然上浮载荷工况进行分析。
For gas pipeline crosses the swamp low-lying soft soil zone, pipe deformation and failure is easily to be caused due to the effect of natural sedimentation or buoyancy. Stress and displacement analysis is necessarily to be carried out during the design phase. According to the design data of the pipeline in XX area, the corresponding stress analysis numerical model is built. For the first time, CAESAR II software is used to do numerical simulation of swamp-crossing gas pipeline. After the settlement of 5~10cm of the sinking pipe are analyzed, it comes to the result that the settlement value has a great influence on the pipeline stress(each additional settlement of 1cm, stress increases approximately 30MPa), the peak value and the second peak value of the stress occurs at the junction of transition section and swampland. Analysis also shows that, for the floating pipeline, the maximum stress occurs at the transition section, rather than in the swampland. These results account for the fact that for the floating pipeline, water buoyancy can reduce concentrated stress produced at junction of the transition section and the swamp, and that stress under the occasional load condition is the highest. So the corresponding engineering recommendations can be put forwarded: when pipeline is in the floating state, the analysis of accidental floating load should be analyzed emphatically.
For gas pipeline crosses the swamp low-lying soft soil zone, pipe deformation and failure is easily to be caused due to the effect of natural sedimentation or buoyancy. Stress and displacement analysis is necessarily to be carried out during the design phase. According to the design data of the pipeline in XX area, the corresponding stress analysis numerical model is built. For the first time, CAESAR II software is used to do numerical simulation of swamp-crossing gas pipeline. After the settlement of 5~10cm of the sinking pipe are analyzed, it comes to the result that the settlement value has a great influence on the pipeline stress(each additional settlement of 1cm, stress increases approximately 30MPa), the peak value and the second peak value of the stress occurs at the junction of transition section and swampland. Analysis also shows that, for the floating pipeline, the maximum stress occurs at the transition section, rather than in the swampland. These results account for the fact that for the floating pipeline, water buoyancy can reduce concentrated stress produced at junction of the transition section and the swamp, and that stress under the occasional load condition is the highest. So the corresponding engineering recommendations can be put forwarded: when pipeline is in the floating state, the analysis of accidental floating load should be analyzed emphatically.
引文
[1]ASME.ASME B31.8 gas transmission and distribution piping systems[S].New York:ASME,2010.
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[5]吴晓南,舒浩纹,昝林峰,等.试压工况下盾构隧道内输气管道应力分析[J].天然气工业,2013,33(3):1-5.(Wu Xiaonan,Shu Haowen,Zan Linfeng,et al.Stress analysis of a gas pipeline through shield tunnels under pressure test conditions[J].Natural Gas Industry,2013,33(3):1-5(in Chinese)).
[6]吴晓南,卢泓方,黄坤,等.基于频谱分析的地震带输气管道应力分析方法[J].天然气工业,2014,34(5):152-157.(Wu Xiaonan,Lu Hongfang,Huang Kun,et al.Stress analysis of gas pipelines at seismic belts based on the spectrum analysis[J].Natural Gas Industry,2014,34(5):152-157(in Chinese)).
[7]吴晓南,鲜燕,黄坤,等.运行工况下隧道内输气管道的应力分析[J].油气储运,2012,31(12):927-930.(Wu Xiaonan,Xian Yan,Huang Kun,et al.The stress analysis of tunnel gas pipeline under operating situation[J].Oil&Gas Storage and Transportation,2012,31(12):927-930(in Chinese)).
[8]Huang Kun,Lu Hongfang,Shen Kunrong,et al.Study on buttresses distance of gas pipelines in the deviated well based on stress analysis method[J].Advance Journal of Food Science&Technology,2013,5(9):1249-1254.
[9]Huang Kun,Wu Shijuan,Chen Liqiong,et al.Stress analysis of oil and gas pipeline parallel laying when traversing tunnels[J].Journal of Chemical and Pharmaceutical Research,2014,6(6):1248-1254.
[2]王善珂,唐秀岐.沼泽地区管道的稳定方法[J].油气储运,1996,15(9):46-49.(Wang Shanke,Tang Xiuqi.Pipe stabilizing methods in swampy area[J].Oil&Gas Storage and Transportation,1996,15(9):46-49(in Chinese)).
[3]黄坤,吴世娟,卢泓方,等.沿坡敷设输气管道应力分析[J].天然气与石油,2012,30(4):1-4.(Huang Kun,Wu Shijuan,Lu Hongfang,et al.Analysis on stress of gas pipeline laid along slope[J].Natural Gas and Oil,2012,30(4):1-4(in Chinese)).
[4]沙晓东,陈晓辉,黄坤,等.输气管道应力影响因素分析[J].天然气与石油,2013,31(1):1-4.(Sha Xiaodong,Chen Xiaohui,Huang Kun,et al.Analysis on factors affecting stress in gas pipeline[J].Natural Gas and Oil,2013,31(1):1-4(in Chinese)).
[5]吴晓南,舒浩纹,昝林峰,等.试压工况下盾构隧道内输气管道应力分析[J].天然气工业,2013,33(3):1-5.(Wu Xiaonan,Shu Haowen,Zan Linfeng,et al.Stress analysis of a gas pipeline through shield tunnels under pressure test conditions[J].Natural Gas Industry,2013,33(3):1-5(in Chinese)).
[6]吴晓南,卢泓方,黄坤,等.基于频谱分析的地震带输气管道应力分析方法[J].天然气工业,2014,34(5):152-157.(Wu Xiaonan,Lu Hongfang,Huang Kun,et al.Stress analysis of gas pipelines at seismic belts based on the spectrum analysis[J].Natural Gas Industry,2014,34(5):152-157(in Chinese)).
[7]吴晓南,鲜燕,黄坤,等.运行工况下隧道内输气管道的应力分析[J].油气储运,2012,31(12):927-930.(Wu Xiaonan,Xian Yan,Huang Kun,et al.The stress analysis of tunnel gas pipeline under operating situation[J].Oil&Gas Storage and Transportation,2012,31(12):927-930(in Chinese)).
[8]Huang Kun,Lu Hongfang,Shen Kunrong,et al.Study on buttresses distance of gas pipelines in the deviated well based on stress analysis method[J].Advance Journal of Food Science&Technology,2013,5(9):1249-1254.
[9]Huang Kun,Wu Shijuan,Chen Liqiong,et al.Stress analysis of oil and gas pipeline parallel laying when traversing tunnels[J].Journal of Chemical and Pharmaceutical Research,2014,6(6):1248-1254.
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