冻土区走滑断层下埋地管道力学性能研究

建立跨断层埋地管道在土壤冻融作用下的有限元模型，进行走滑断层错动下的热力耦合分析，研究并获得钢管道应变发展规律。研究发现不同地面和介质温度时的土体刚度分布不同，引起断层错动时管土相互作用不同，从而引起不同的管道应变发展规律。通过真实温度场和简化温度场时的力场数值模拟结果对比分析，发现对应两种温度场的应变规律差别较大，且管道发生局部屈曲明显早于拉伸破坏。建议对于跨冻土断层埋地管道，应考虑地表温度和管内流体温度，通过模拟得到真实温度场，进行热力耦合分析，得到管道断层错动应变后进行抗震设计。

Performance Research of Buried Pipeline Under Strike-slip Fault Movement in Permafrost Region

This paper established analytical model of pipe-soil system under freezing-thawing, conducted thermo-mechanical coupling analysis of the system under fault movement, and investigated the strain developing law. Different soil stiffness at different temperatures, leads to different pipe-soil interaction and different strain development laws of the pipe under fault movement. By comparing the numerical results of the force field under the real temperature field and the simplified temperature field, it is found that the strain law corresponding to the two temperature fields is quite different, and the local buckling of the pipeline is obviously earlier than the tensile failure. It is recommended that for the buried pipeline across the frozen soil fault, it is necessary to obtain the true pipe-soil temperature field by finite element simulation considering the temperature of the soil ground and pipe fluid, and then adopt the strain under fault movement for the seismic design or checking computation.