斜坡非均匀弧形滑动下管道力学行为研究  

Mechanical Behavior of Pipeline Under Uneven Circular Slide on Slope

作　　者：李安 王东源[2] 张振永[2] 曹宇光[3] 张旭 Li An;Wang Dongyuan;Zhang Zhenyong;Cao Yuguang;Zhang Xu(PipeChina Construction Project Management Branch;China Petroleum Pipeline Engineering Corporation;College of Pipe-line and Civil Engineering,China University of Petroleum(East China))

机构地区：[1]国家石油天然气管网集团有限公司建设项目管理分公司 [2]中国石油天然气管道工程有限公司 [3]中国石油大学(华东)储运与建筑工程学院

出　　处：《石油机械》2024年第3期126-134,共9页China Petroleum Machinery

基　　金：国家自然科学基金项目“基于断裂过程正演与反演的高钢级输气管道止裂预测模型研究”(12272412);“超临界CO_(2)管道流固耦合力学行为与止裂控制模型研究”(12202502)。

摘　　要：目前尚未建立准确描绘斜坡三维非均匀圆弧滑动下探究管道力学行为的模型。为此,基于强度折减理论,利用2D平面应变有限元模型确定斜坡失稳滑动面,基于2D平面应变有限元模型的斜坡滑动轨迹,纳入非均匀三角函数型表征的滑坡位移函数,建立含有滑坡真实滑动面的3D有限元模型。基于中缅油气管道的工程案例及参数取值范围,充分分析8种无量纲因素对管道轴向拉伸应变行为的影响。研究结果表明:减小埋深、增大壁厚、根据径厚比设计管道穿越斜坡位置、合理把关回填土力学性能等措施,能极大地降低管道在轴向失效的可能性;通过控制管道壁厚能有效减小土壤内摩擦角和运行内压带来的影响。研究结论可为穿越斜坡段敷设的管道设计工作提供理论指导。There is no model that can accurately describe the mechanical behavior of pipelines under 3D une-ven circular slide on slopes.Based on the strength reduction theory,a 2D plane strain finite element model was used to determine the destabilizing sliding plane of the slope.Then,based on the slope sliding trajectory of the 2D plane strain finite element model,the landslide displacement function characterized by nonuniform trigonometric function was introduced to build a 3D finite element model containing the real sliding plane of the landslide.Final-ly,based on the project case background and parameter range of the Myanmar-China Oil and Gas Pipeline,the in-fluences of 8 dimensionless factors on the axial tensile strain behavior of the pipeline were fully analyzed.The re-sults show that the measures such as reducing buried depth,increasing wall thickness,designing pipeline crossing slope position based on diameter to thickness ratio and reasonably controlling the mechanical properties of backfill can greatly reduce the possibility of axial failure of pipelines.By means of controlling the wall thickness of pipe-lines,the influence of internal friction angle of soil and operating internal pressure can be effectively reduced.The study conclusions provide theoretical guidance for the design of pipelines laid through slope sections.

关 键 词：管道敷设 圆弧形滑坡 数值模型 管道力学行为 影响因素 拉伸应变 

分 类 号：TE832[石油与天然气工程—油气储运工程]