竖向荷载作用下含接头埋地PE管道-基土相互作用模型试验研究

doi:10.11885/j.issn.1674-5086.2024.06.11.04

摘要/Abstract

摘要： 竖向荷载作为常见却容易被忽视的危险因素会引起埋地PE管道失效。基于自主研发的管道试验平台，开展了含接头埋地PE管道-基土相互作用的缩尺模型试验，探究了竖向荷载作用下含接头埋地PE管道力学响应以及管-土耦合作用机制。试验结果表明，竖向荷载作用下埋地PE管道系统的破坏易始于接头部位，首先从接头焊缝处萌生微裂纹，随后在外力持续作用下裂纹沿焊缝定向扩展。荷载作用下管道发生的水平位移加剧管道变形，埋地PE管道在地面竖向荷载作用下沿轴线整体出现拉伸变形，管道纵向应变主要表现为管顶拉应变、管底压应变。由于土壤对荷载的消散作用，增加管道埋深可以有效减小地表竖向荷载对管道的破坏作用。

关键词: 含接头管道, 竖向荷载, 管道变形, 失效, 模型试验

Abstract: Vertical load, as a common yet easily overlooked hazard factor, can cause the failure of buried PE pipeline. Based on the independently developed pipeline-soil interaction test platform, this paper carried out a model test of the interaction between the foundation soil and buried PE pipe with joint, and and explored the mechanical response of buried PE pipeline with joints under vertical loads and the mechanism of pipe-soil coupling processes. The results showed that the failure of buried PE pipeline systems under vertical loads was prone to start at the joint. Firstly, micro-cracks emerged from the weld seam of the joint. Then, under the continuous action of vertical load, the cracks expanded along the weld seam. Additionally, under the action of vertical load, the horizontal displacement of the pipeline intensified the deformation of the pipeline. Buried PE pipelines, under the action of vertical load, underwent overall tensile deformation along the axis. The longitudinal strain of the pipeline was mainly manifested as tensile strain at the top of the pipeline, and the compressive strain at the bottom of the pipeline. Due to the dissipation effect of soil on vertical load, increasing the burial depth of pipelines can effectively reduce the destructive effect of vertical loads on pipelines.

Key words: pipeline with joint, vertical load, pipe deformation, failure, model test

中图分类号:

TE832

路建国, 陶锐, 李鹏程, 王大国, 李潮浪. 竖向荷载作用下含接头埋地PE管道-基土相互作用模型试验研究[J]. 西南石油大学学报(自然科学版), 2026, 48(3): 155-164.

LU Jianguo, TAO Rui, LI Pengcheng, WANG Daguo, LI Chaolang. Model Experiment on the Interaction Between the Buried PE Pipeline with Joint and Foundation Soil Under the Vertical Load[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2026, 48(3): 155-164.

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