地震灾害下埋地管道的有限元分析

Finite Element Analysis of Buried Pipeline in Earthquake Disaster

管道运输是输送油气等重要物资的主要手段,而地震对埋地管道的破坏是难以修复的。首先,基于非线性动力学理论,运用ANSYS有限元软件建立了管道-土体模型;然后,建立管道与土体之间的非线性接触模型,通过对有限元模型施加载荷,得到了埋地管道的静力分析结果;最后,对埋地管道施加不同的地震波并进行了比较。结果表明,管道的上部和下部在地震波的影响下产生了较大的位移;随着输入的地震波逐渐加大,管道下部的位移减小,但仍大于管道两侧的位移。由此可知,发生地震时管道的上部和下部受到的影响较大。

Pipeline transportation is the main means to transport oil and gas and other important materials, and the damage of buried pipelines by earthquake is difficult to repair. Based on the nonlinear dynamic theory, the ANSYS finite element software was used to establish the pipeline-soil model, and then the nonlinear contact model between pipeline and soil was established.Finally, different seismic waves were applied to the buried pipeline and compared. The results show that the upper and lower parts of the pipeline have large displacements under the influence of seismic waves;as the input seismic waves gradually increase, the displacement of the lower part of the pipeline decreases, but it is still greater than the displacement on both sides of the pipeline. It can be seen that the upper and lower parts of the pipeline will be greatly affected when an earthquake occurs.