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中澳天然气技术伙伴关系基金资助项目。
为保障天然气埋地管道的安全运行，需要对其在不均匀沉降状态下的应力水平及其影响因素进行研究。选取该管道系统易发生应力集中的3个关键部位进行现场应力测试，得到系统运行时管道的应力值。应用ANSYS软件建立了管土非线性接触模型，通过对其进行分析，得到管道应力水平并建立了沉降差量与最大Von-Mises应力之间的映射关系。在该模型的基础上，探讨了管径、壁厚、埋深、埋土弹性模量、埋土泊松比对管道应力状态的影响。增大壁厚和埋土弹性模量以及减小埋深和管径均可降低不均匀沉降时管道的最大Von-Mises应力。研究结果为目前大量在建及在役天然气埋地管道的安全运行提供了理论支持，并提出了针对性的改进措施。
It is necessary to study the stress and its influence factors of buried pipelines which are under uneven settlement in order to ensure the safe operation. Stress measurement was taken on 3 representative testing points on pipelines and the pipelines' stress in operation was obtained. The nonlinear contact model of pipe and soil was built by using ANSYS. By analyzing the model, pipelines stress was obtained and the mapping relationship of the settlement with the maximum Von-Mises stress was set up. Based on this model, the influence of diameter, wall thickness, burial depth, soil's elasticity modulus and Poisson's ratio on the stress status of pipelines were also studied. Increasing wall thickness and soil's elasticity modulus and decreasing burial depth and diameter can reduce the maximum Von-Mises stress of pipelines under uneven settlement. The research methods and achievements may offer basis and measures for further researches on mechanical characteristics of natural gas pipelines under uneven settlement.
马小明,康逊.埋地管道不均匀沉降的应力及影响因素分析[J].重庆大学学报,2017,40(8):45-52.
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