地震载荷工况下隧道内油气管道应力分析研究  

Stress analysis of oil and gas pipeline at seismic load conditions in tunnel

作　　者：孙靖云[1] 陈利琼[1] 夏燕[1] 宋利强[1] 刘琦[1] 韩晓瑜[1] 

机构地区：[1]西南石油大学石油与天然气工程学院,成都610500

出　　处：《应用力学学报》2017年第4期795-801,共7页Chinese Journal of Applied Mechanics

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"(2016YFC0802100);中国科学院咨询项目工程"油气管道网安全发展战略研究"(2015-XZ-37);中国石油创新基金会(206D-5007-0602)

摘　　要：为了了解隧道内油气管道在地震载荷工况下的应力分布情况,有必要对其进行应力分析。基于地震响应谱分析法,采用CAESAR Ⅱ软件建立了地震载荷工况下中缅某段隧道内油气管道的应力模型,对其进行应力分析,并校核了油气管道的位移、应力是否符合规范。分析研究了管道的最危险截面;计算出了危险弯管的应力比率,校核了应力允许值;分析得出,轴向地震作用与综合地震作用对管道影响较大,应重点校核管道的轴向地震与综合地震作用下的应力变化,并加强监测力度;通过对油气管道的位移校核得出,轴向地震作用与综合地震作用对隧道内油气管道的位移影响较大;地震作用下隧道内轴向位移较其他两方向位移较大,应重点监测。对斜管长度、覆土深度、管道内压等影响因素进行研究得出:架空段管道长度与倾角、地震烈度、管道运行温度与管道内压对穿越地震带隧道管道应力影响较大;而覆土段管道长度与倾角、覆土深度对管道影响较小。At present, the stress analysis mostly aimed at general buried pipeline with long distance, so few of the tunnels of oil and gas pipeline(especially at the seismic load) stress is analyzed. Therefore, it is necessary to analyze the stress distribution of oil and gas pipeline at seismic load in tunnel. In this paper, CAESAR Ⅱ software is used to establish the stress model of China-Myanmar XX tunnel pipeline at seismic load condition, based on the seismic spectrum. A pipeline dynamic stress analysis is performed by inputting spectral parameters of the pipelines, and the results indicated whether or not the pipeline displacement and stress under a violent seismic action would conform to specification. The following findings are made. Firstly, Bend 2 of oil and gas pipeline is the dangerous section. To oil pipeline, the stress ratio is 96.73% of bend 2, which close to the allowable stress. So stress relief measures should be taken to reduce the stress. Secondly, axial seismic action and comprehensive seismic action effect are of greater impact on pipelines. Therefore, the stress variation at the axial seismic and comprehensive seismic action should be focused. Thirdly, through the displacement checking for the oil and gas pipeline,the effect of axial seismic action and comprehensive seismic action on displacement are larger. Finally, unlike buried pipeline, the axial displacement is large compared to other two direction displacement. Therefore, strengthen the monitoring efforts is necessary.

关 键 词：隧道 油气管道 地震 应力分析 CAESAR Ⅱ 响应谱分析 

分 类 号：TU311.3[建筑科学—结构工程]