In this work, a rigorous 3D finite element (FE) model was established to investigate the mechanical behavior of buried DN110 High-density polyethylene (HDPE) pipe with a scratch defect under land subsidence. Parametric effects, including soil gravity, defect geometric, operating pressure, transition section length, and land subsidence displacement, were investigated to analyze the significance of each factor on mechanical stress field. Then the land subsidence displacement was selected as the evaluation index of the ultimate bearing capacity (UBC) of the pipeline. A model was developed to discuss the function relationship between the land subsidence displacement and other parameters.

在这项工作中，建立了严格的3D有限元（FE）模型，以研究埋入式DN110高密度聚乙烯（HDPE）管道在地面沉降下具有划痕缺陷的机械性能。研究了参数影响，包括土壤重力，缺陷几何形状，工作压力，过渡段长度和地面沉降位移，以分析每个因素对机械应力场的重要性。然后选择地面沉降位移作为管道极限承载力（UBC）的评价指标。开发了一个模型来讨论地面沉降位移与其他参数之间的函数关系。