基于有限元方法的滑坡地段输气管道应力分析-天然气工业.pdfVIP

· 84 · 天 然 气 工 业 2017 年2 月 基于有限元方法的滑坡地段输气管道应力分析 1 1 2 1 1 1 1 陈利琼 　宋利强 　吴世娟 　邱星栋 　刘 琦 　夏 燕 　孙靖云 1. 西南石油大学石油与天然气工程学院　2. 中国石化西南油气分公司广西采油厂 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：①CAESAR 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。 关键词　滑坡地段　输气管道　应力分布规律　ANSYS　CERSAR II　应力应变　位移量　管道屈曲变形程度 DOI: 10.3787/j.issn.1000-0976.2017.02.011 FEM-based stress analysis of gas pipelines in landslide areas 1 1 2 1 1 1 1 Chen Liqiong , Song Liqiang , Wu Shijuan , Qiu Xingdong , Liu Qi , Xia Yan Sun Jingyun (1. School of Oil and Natural Gas Engineering, Southwest Petroleum University, Chengdu, Sichuan 610500, China ; 2. Guangxi Oil Production Plant, Sinopec Southwest Oil Gas Field Company, Deyang, Sichuan 618100, China) NATUR. GAS IND. VOLUME 37, ISSUE 2, pp. 84-91, 2/25/2017. (ISSN 1000-0976; In Chinese) Abstract: In order to guarantee the safe operation of long-distance gas pipelines, it is necessary to identify the stress distribution laws of gas pipelines running through landslide areas and take corresponding measures. In this paper, based on the finite element method, the stress of gas pipelines running through landslide areas longitudinally and transversally was analyzed by using CAESAR II and ANSYS. Then, the effects of the displacement and soil properties of landslides and the OD, wal