走滑断层位移作用下X80天然气管道的管沟合理尺寸分析

发布时间：2018-07-20 20:42

【摘要】：活动断层是埋地长输管道安全运行面临的主要威胁,走滑断层是常见的1种断层形式,走滑断层错动下管道会产生较大的轴向应变而引发失效。采用松散颗粒状的松砂土进行管沟回填是穿越断层埋地管道主要的抗震措施之一。为得到经济有效、适用工程的管沟尺寸,基于非线性有限元方法建立了准确的考虑管沟回填的管道穿越走滑断层数值模型,使用壳单元和实体单元模型来模拟管道和土壤,采用面与面接触算法准确描述管土接触;通过参数化计算,分析了管沟的几何尺寸对管道应变的影响,并基于经济性原则给出了管沟尺寸的建议值。结果表明:管沟坡度是影响管道应变的主要因素,工程中建设管沟时建议其管沟坡度小于1,且管道尽量浅埋,对于管沟加宽裕量可不做特殊处理。研究结果可为埋地管道的抗震设计提供参考,为管道的安全运营提供保障。
[Abstract]:Active fault is the main threat to the safe operation of buried long-distance pipeline, and strike-slip fault is a common fault form. When the strike-slip fault is staggered, the pipeline will produce larger axial strain and lead to failure. It is one of the main seismic measures to use loose granular loose sand soil to backfill pipe trench through fault buried pipeline. In order to obtain the economical and effective pipe channel size, based on nonlinear finite element method (FEM), an accurate numerical model of pipeline traversing strike-slip fault is established, and the shell element model and solid element model are used to simulate the pipeline and soil. The surface to surface contact algorithm is used to accurately describe the pipe-soil contact, and the influence of the geometric size of the pipe ditch on the pipe strain is analyzed through parameterized calculation, and the suggested value of the pipe ditch size is given based on the economic principle. The results show that the slope of the pipe trench is the main factor affecting the strain of the pipe. It is suggested that the slope of the pipe trench should be less than 1, and the pipe should be buried as shallow as possible, and no special treatment should be made for the extra margin of the pipe ditch. The results can provide reference for seismic design of buried pipeline and guarantee for safe operation of pipeline.
【作者单位】：中国石油大学(北京)机械与储运工程学院;中国石化石油工程设计有限公司;北京首都国际机场股份有限公司;
【基金】：国家重点研发计划课题(2016YFC0802105)
【分类号】：TE973.1

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