交通荷载作用下埋地含缺陷PE管道力学行为研究

为分析埋地含缺陷PE管道在交通荷载作用下的力学行为，选用Prony级数模拟管道，并采用ABAQUS有限元软件建立不同缺陷PE80管道模型和不同埋深的管土模型。通过对管道轴向与环向应力的研究，确定不同条件下管道的应力大小与分布。结果表明:当管道存在缺陷时，缺陷处会出现应力突变；不同位置的缺陷对管道的应力分布影响不同；缺陷相对深度改变会使缺陷处应力变化明显，通过建立多元回归方程得出对缺陷管道最大Von Mises应力影响程度为，缺陷相对深度（Q）>管道埋深（H）>车辆荷载（P）。

Study on mechanical behavior of buried PE pipeline with defect under traffic load

In order to analyze the mechanical behavior of buried PE pipeline with defect under the traffic load,the pipeline was simulated by using Prony series,then the models of PE80 pipeline with different defects and the pipe soil models with different burial depths were built by using the ABAQUS finite element software.Through the research on axial stress and circumferential stress of the pipeline,the magnitude and distribution of the pipeline stress under different conditions were determined.The results showed that when there was a defect in the pipeline,the stress mutation would appear at the defect location.The defects at different locations had different influence on the stress distribution of pipeline.The change of the relative depth of defect would make the stress change at the defect location obvious.A multivariate regression equation was established,and the influence degree on the maximum Von Mises stress of the pipeline with defect was obtained as: the relative depth of defect (Q)>buried depth of pipeline (H)>vehicle load (P).