基于有限元方法的滑坡地段输气管道应力分析

发布时间：2018-02-28 18:08

本文关键词： 滑坡地段输气管道应力分布规律 ANSYS CERSARII 应力应变位移量管道屈曲变形程度　出处：《天然气工业》2017年02期 　论文类型：期刊论文

【摘要】：为了保障天然气长输管道的安全运行,需要探寻输气管道穿越滑坡地段的应力分布规律并采取应对措施,为此,采用CAESAR II软件和ANSYS软件对埋地输气管道纵向和横向穿越滑坡段进行了应力分析,并研究了滑坡体的位移量、土壤性质,管道外径、壁厚、内压和管材等对管道应力应变的影响。研究结果表明:1 CAESAR II的应力与位移计算结果均趋于保守,但对分析结果可以进行更为详尽的分析和考虑,而ANSYS软件处理非线性问题更为准确;2纵向滑坡作用下,管线的最大等效应力应变和位移量均出现在弯管处,说明弯管是应力危险截面;3滑坡体位移量越大,管道承受的应力越大,失效的可能性也越大;4径厚比越小,管道安全稳定性越好;5相对于纵向滑坡,横向滑坡则要危险得多,很可能会造成管线的局部屈曲变形甚至拉伸断裂;6处在滑坡区的管道屈曲变形程度很大,因此建议使用浅埋方式穿越滑坡多发地段和古滑坡区。
[Abstract]:In order to ensure the safe operation of the long distance natural gas pipeline, it is necessary to explore the stress distribution law of the gas pipeline passing through the landslide and take countermeasures. Using CAESAR II and ANSYS software, the stress analysis of buried gas pipeline is carried out in longitudinal and transverse directions. The displacement, soil properties, pipe diameter and wall thickness of the landslide are studied. The results show that the stress and displacement calculation results of 1 CAESAR II tend to be conservative, but the analytical results can be analyzed and considered in more detail. The maximum equivalent stress-strain and displacement of the pipeline appear in the bend under the action of the ANSYS software to deal with the nonlinear problem more accurately, which indicates that the displacement of the slope body with the dangerous section of stress is larger, and the maximum equivalent stress strain and displacement of the pipeline appear at the bend, which indicates that the displacement of the slope body is larger. The greater the stress the pipeline bears, the greater the probability of failure is. The better the safety and stability of the pipeline is, the more dangerous the lateral landslide is. It is very likely that the local buckling deformation of the pipeline and even the degree of buckling deformation of the pipeline located in the landslide area by tensile fracture are very large, so it is suggested that shallow buried way should be used to cross the landslide-prone area and the ancient landslide area.
【作者单位】：西南石油大学石油与天然气工程学院;中国石化西南油气分公司广西采油厂;
【基金】：2016国家重点研发计划“油气长输管道及储运设施检验评价与安全保障技术”(编号:2016YFC0802100) 中国工程院咨询研究项目“油气管网系统安全发展战略研究”(编号:2015-XZ-37)
【分类号】：TE973

【相似文献】