Abstract: Because of the complex terrain in the construction of longdistance buried pipeline, the elbows are widely used in pipeline systems. Due to its specificity in terms of shape and structure, elbows not only can change the axial direction of the pipeline, but also increase the flexibility of the pipeline. However, under the special conditions of environment, bends in the piping system are often the section of concentration of stress. In the certain conditions, plastic deformation occurs at the elbow, which poses a potential threat to the safe operation of pipelines. Through the application of software of finite element analysis, stress at a particular point (elbow) of buried pipeline were numerically calculated and analyzed. By numerical calculation and analysis, when the local pipeline under pressure in the radial direction, the distribution of values of Von Mises stress were obtained at the elbow, in the crossing segment of the buried pipeline. And when the length of the applied load, the bending angle and the radius of curvature of elbow were changed, the influence of the stress of the elbow was also obtained.

Key words: Buried pipelines, Segment of waters crossing, Elbow, Fault, Numerical calculation

摘要： 在长输埋地管道的施工中, 由于地形复杂多变, 弯管被广泛应用于管路系统当中。因为弯管具有特殊的形状和结构形式, 所以弯管不但可以改变管道的轴线方向, 而且增加管线的柔性。但是, 在特殊的环境条件下,弯管往往是管路系统中应力集中的部位, 在一定的条件下会引起塑性变形, 给管道的安全运行带来隐患。应用有限
元分析软件, 对埋地输油管道的特殊点处( 弯管) 的应力进行了数值计算与分析, 得到了埋地输油管道在管路穿越段局部承受径向压力载荷时弯管处 V o nM i s e s应力分布规律, 以及当载荷长度、 弯管角度和曲率半径对弯管所受应力的影响规律。

关键词: 埋地管道; , 水域穿越段; , 弯管; , 断层; , 数值计算