地面挖掘工况下PE燃气管道响应有限元分析

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中图分类号：TP391.7 文献标志码：A 文章编号：1003-5168（2025）21-0088-06

DOI：10.19968/j.cnki.hnkj.1003-5168.2025.21.017

Abstract： [Purposes] This study investigates the influence of ground excavation conditions on the mechanical characteristics and dynamic response of non-contact polyethylene （PE） gas pipelines. It aims to provide a basis for risk assessment and safety protection strategies for PE pipelines during engineering machinery construction，ensuring the safe operation of polyethylene gas pipelines.[Methods] Through nonlinear finite element analysis，the buried depth of the pipeline，the internal pressure of the pipeline， theexcavation load，andthedefect scale were varied to study the degree of change in the stressand displacement response of the PE 1OO gas pipeline under ground excavation conditions.[Findings] Under non-contact excavation conditions，when the pipeline internal pressure is ≤O.8 MPa， the stress growth rate is faster.When the internal pressure is >O.8 MPa，the stress growth rate slows down，and the increase inthe overall stiffness of the pipeline improves its stability.The buried depth inhibits pipeline deformation through soil constraints; this protection fails at shallow burial depths.A buried depth ⩽0.4 m is identifiedas a shallw high-risk area.As the excavation load increases，plastic deformation accumulates. Defect sizes weaken local stiffness and exacerbate damage，with the mid-pipe region being particularly sensitive.[Conclusions] Based on the data patterns， excavation damage may involve three typical paths： local buckling，plastic deformation accumulation，and constraint failure. These can be prevented using active protection systems such as excavation space avoidance，load-defect coordinated control，and soil strengthening.

Keywords： polyethylene gas pipeline; excavation load; nonlinear finite element; stress; defect

0 引言

聚乙烯（Polyethylene，简称PE）管道因耐腐蚀、寿命长、柔韧性好等优势，已成为城镇燃气管网的主要材料，在国内新建中低压燃气管道中占比超90%[1] 。（剩余7074字）