管道穿越河流堤防的渗流稳定性分析
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摘要
管道穿越会对河流堤防稳定性造成影响,需要进行危害预测与防控。应用Visual Modflow软件构造管道穿越初期及穿越后较长时间情况下的数值模型,对管道穿越前后堤防的渗流稳定进行分析与计算;并求得各模型对应的最大水力坡度分别为0.162、0.195与0.158,而允许水力坡度为0.402。研究结果表明:管道穿越初期会增加堤防的水力坡度,增大堤防发生渗透破坏的危险程度;穿越后较长时间的水力坡度会有回落,且管道穿越初期的模型结构更适合应用于工程实际。
The pipeline crossing can affect the stability of river dikes, which need to study of damage controlling and forecasting. A numerical model was applied to construct the pipeline crossing in the early stage and the later stage for a long time by the Visual Modflow, and the stability of the dike before and after pipeline crossing were analyzed and calculated; the maximum hydraulic gradient corresponding to each model were 0.162, 0.195 and 0.158 respectively, while the critical hydraulic gradient was 0.402. The results showed that the pipeline crossing would increase the hydraulic gradient in early time, so the same as the degree of risk of damage; and the hydraulic gradient would fall a little after a long time of crossing. In addition, it could be seen that the early model structure was more suitable for engineering practice.
The pipeline crossing can affect the stability of river dikes, which need to study of damage controlling and forecasting. A numerical model was applied to construct the pipeline crossing in the early stage and the later stage for a long time by the Visual Modflow, and the stability of the dike before and after pipeline crossing were analyzed and calculated; the maximum hydraulic gradient corresponding to each model were 0.162, 0.195 and 0.158 respectively, while the critical hydraulic gradient was 0.402. The results showed that the pipeline crossing would increase the hydraulic gradient in early time, so the same as the degree of risk of damage; and the hydraulic gradient would fall a little after a long time of crossing. In addition, it could be seen that the early model structure was more suitable for engineering practice.
引文
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[15]王维.双管线柔性壁渗透仪用于水泥土渗透特性的测试[J].土工基础,2017,31(4):503-506.
[2]徐洁,谢悦波.西气东输某输气管道穿越工程对二河河道行洪及堤防安全的影响[J].水电能源科学,2014,32(2):118-120.
[3]唐明明,王芝银,马兰平,等.油气管道穿越黄土冲沟的管线设计参数研究[J].岩土力学,2010,31(4):1314-1318.
[4]陈宏任,张贵金,李毅,等.穿江管道对堤防渗透安全的影响研究[J].人民黄河,2017,39(2):34-41.
[5]Ranilovic M.Organizing the Crossing of a Gas Pipeline over Guduca Canyon[J].Procedia Engineering,2014(69):871-880.
[6]Zhang J,Liang Z,Zhang H,et al.Failure analysis of directional crossing pipeline and design of a protective device[J].Engineering Failure Analysis,2016(66):187-201.
[7]Han B,Wang Z Y,Zhao H L,et al.Strain-based design for buried pipelines subjected to landslides[J].Petroleum Science,2012,9(2):236-241.
[8]Latorre C A,Wakeley L D,Conroy P J.Guidelines for Installation of Utilities Beneath Corps of Engineers Levees Using Horizontal Directional Drilling[R].US:Engineer Research and Development Center Vicksburg Ms Geotechnical and Structures Lab,2002:6-9.
[9]丁鹏,闫相祯,杨秀娟.水平定向钻管道穿越中力学参数研究[J].西南石油大学学报2007,29(5):153-155.
[10]Wu Z,Barosh P J,Wang L,et al.Numerical modeling of stress and strain associated with the bending of an oil pipeline by a migrating pingo in the permafrost region of the northern Tibetan Plateau[J].Engineering Geology,2008,96(1-2):62-77.
[11]Tarchi D,Casagli N,Fanti R,et al.Landslide monitoring by using ground-based SAR interferometry:an example of application to the Tessina landslide in Italy[J].Engineering Geology,2003,68(1-2):15-30.
[12]王怡,王芝银,马兰平,等.管道穿越黄土陡坡斜井工程稳定性分析[J].岩土力学,2008,29(S):267-271.
[13]陈崇希,唐仲华.地下水流动问题数值方法[M].武汉:中国地质大学出版社,2009.
[14]王雪,束龙仓,刘瑞国.工程措施对河流与地下水补给关系的影响分析[J].中国农村水利水电,2007(5):16-20.
[15]王维.双管线柔性壁渗透仪用于水泥土渗透特性的测试[J].土工基础,2017,31(4):503-506.