地基沉降载荷作用下压气站管道力学分析

Mechanical Analysis of Natural Gas Station Pipeline Under the Load of Foundation Settlement

针对某天然气管道黄土地基沉降项目,结合数值模拟和现场监测方法对管网应力进行分析,为湿陷区的管网应力分析提供理论依据。数值模拟结果与DH5971监测数据的最大相对误差为9.8%,说明了模拟结果的合理性。管网力学性能的研究表明越靠近埋地主管部分,管道应力集中现象越明显;管网左侧主管三通处应力为440 MPa,已进入塑性变形阶段。对管网应力释放的研究表明:右侧位移约束消除后,三通处的应力仅为205 MPa,管网应力下降明显;左侧断面应力释放后X向位移变化最大,达到322 mm。

For a natural gas pipeline loess foundation settlement project,the method combining simulation and monitoring was used to analyze the stress of the pipeline network,which provided a theoretical basis for the stress analysis of the pipeline network in the subsidence area.The maximum relative deviation between the numerical simulation results and the DH5971 monitoring data was 9.8%,which illustrated the rationality of the simulation results.The closer to the buried main pipe,the more evidence of the pipe stress concentration phenomenon.The stress at the main pipe tee on the left side of the pipe network was 440 MPa,which has entered the plastic deformation stage.After the displacement constraint on the right side was eliminated,the stress at the tee was only 205 MPa,and the pipe network stress dropped significantly.After the stress was released on the left section,the X-direction displacement changes the largest,reaching 322 mm.