高烈度地震区油气管道隧道抗震分析

Analysis on Seismic Resistance of Oil & Gas Pipeline Tunnel in High Intensity Seismic Zone

中亚天然气管道D线工程(简称中亚D线)隧道众多,隧道全部处于9度及以上的高烈度地震区,部分隧址区地震加速度峰值达0.6 g,超出目前国内所有设计规范规定的地震加速度峰值,在设计过程中没有相应的规范及工程实例可参考,为解决该问题,开展了高烈度地震区油气管道隧道抗震分析,以作为设计依据。为了验证设计阶段拟选复合式衬砌支护参数的准确性,通过对国内外隧道抗震计算方法及国内现行隧道抗震规范的研究,结合中亚D线实际特点,提出了适用于油气管道隧道抗震分析的简化方法,并以Ⅵ级围岩为例,采用简化方法对中亚D线隧道工程进行了抗震计算。计算结果显示,拟选的复合式衬砌支护结构安全性系数满足相关隧道设计规范规定的稳定性及构造要求。综合分析表明,本文选取的抗震分析简化方法操作性强,拟选的Ⅵ级围岩复合式衬砌支护参数合理,可为类似油气管道隧道的抗震分析及规范修订提供参考。

There are many tunnels in Central Asia Natural Gas Pipeline Line D Project,all of which are located in seismic zones with9° or higher intensity.Moreover,earthquake peak acceleration at some tunnel sites reaches up to 0.6 g,more than any one in all current codes,standards and specifications of China and no relevant design criterion and project case can be available for reference during design up to now.In order to solve this problem,conducted is analysis on seismic resistance of oil & gas pipeline tunnel in high intensity seismic zone as the design basis.In order to verify the accuracy of the proposed composite lining supporting parameters in design stage,studied are domestic and overseas tunnel seismic calculation methods and current domestic tunnel seismic codes,analyzed are characteristics of Central Asia Natural Gas Pipeline Line D Project and put forward is a short-cut method easy to master by technicians and applicable to analysis on seismic resistance of oil & gas pipeline tunnel.Taking Grade VI wall rock as an example,the short-cut method is applied to conduct comprehensive analysis on seismic resistance of tunnels in Central Asia Natural Gas Pipeline Line D Project.The results show that the safety factor of proposed composite lining supporting structure meets the requirements in relevant tunnel design codes,the short-cut method of seismic resistance analysis has powerful operability,the proposed Grade VI wall rock composite lining supporting parameters are reasonable,which can provide reference for seismic resistance analysis and regulations amendment of oil and gas pipeline tunnels in similar conditions.