土体不均匀沉降下越站管道应力有限元分析

Finite Element Analysis of Stress in Crossing Station Pipeline under Uneven Soil Settlement

为探求土体不均匀沉降作用下管道的应力响应规律,以某分输站越站管道为研究对象,利用ANSYS有限元软件创建管-土1∶1非线性接触几何模型,以11次沉降监测值为依据,开展管道应力有限元分析。研究结果表明:沉降区域正下方的管道出现最大总变形,土体持续沉降会对管道变形产生严重影响;地上管道被支座固定时,易受下方土体沉降影响,造成应力集中现象;在管土相互作用下,管道应力会受相邻土体的沉降而逐步增大。研究成果可为天然气管道的设计、运维和完整性安全评价提供参考价值,有助于关口前移、控制风险。

In order to investigate the stress response rule of pipeline under the action of uneven soil settlement,a pipeline crossing station was taken as the research object,and a 1:1 nonlinear contact geometric model of tube-to-soil was created by using ANSYS finite element software.The finite element analysis of pipeline stress was carried out on the basis of 11 settlement monitoring values.The results show that the maximum total deformation occurs in the pipeline directly below the settlement area,and the continuous soil settlement will have a serious impact on the deformation of the pipeline.When the above ground pipeline is fixed by the support,it is easy to be affected by the settlement of the soil below,resulting in the phenomenon of stress concentration.Under the interaction between pipe and soil,the pipe stress will gradually increase due to the settlement of adjacent soil.The research results can provide reference value for the design,operation and integrity safety evaluation of natural gas pipelines,and help to move key points forward and control risks.