管土界面滑移机制离心模拟及管道影响范围动态演化研究

Centrifugal simulation of slip mechanism at pipe-soil interface and dynamic evolution of pipeline influence range

摘要

为了研究坡体失稳对油气管道安全运行的影响机制及确定受影响管道的处置长度，以应对油气管道运营过程中的重大风险，本文采用土工离心机模型试验方法，模拟坡体横向作用下管道的变形破坏过程，定量表征了管道在坡体不同滑移阶段(蠕变－滑动－破坏)的应变响应规律，并借助ABAQUS有限元软件模拟确定了坡体移动段受影响管道的处置长度。研究结果表明，离心机装置成功模拟了埋地管道受拉伸、弯曲等复杂多轴受力状态，再现了管道3个变形阶段的应力－应变状态，与管道整体弯曲－局部屈曲、两端拉断的变形破坏模式相吻合。管道位移和应变值均随g值增大而增大，且从中间向两侧递减；通过分析得出显著位移外延范围长度值，明确了受影响管道的处置长度。研究结论可为管道应急处置工作提供重要的技术支撑，提高抢修工作的效率和准确性，同时有助于更好地理解坡体失稳对管道的影响机制，为管道设计和维护提供更加科学的依据。

Abstract

To investigate the impact mechanism of slope instability on pipeline safe operation and determine the disposal length of the affected pipeline to cope with the major risks during oil and gas pipeline operation, this paper adopts the geotechnical centrifuge model test method to simulate the deformation and failure process of the pipeline under the lateral action of the slope, quantitatively characterizes the strain response law of the pipeline at different slope slip stages (creep-sliding-failure), and determines the disposal length of the affected pipeline in the slope movement section with the help of ABAQUS finite element software simulation. The test results show that the centrifuge device successfully simulated the complex multi-axial stress state of buried pipeline under tension and bending, reproduced the stress and strain states of the pipeline at three deformation stages, which is consistent with the pipeline deformation and failure mode of overall bending-local buckling and end-breaking. Both pipeline displacement and strain value increase with the increase of g-value, and decrease from the middle to both sides. The significant displacement extension range length value is obtained through analysis, and the disposal length of the affected pipeline is clarified. The research conclusions can provide important technical support for pipeline emergency disposal work, improve the efficiency and accuracy of repair work, and also help to better understand the impact mechanism of slope instability on pipeline, providing a more scientific basis for pipeline design and maintenance.

关键词

油气管道 / 坡体移动 / 影响范围 / 离心机试验 / 破坏机理

Key words

oil and gas pipeline / slope movement / influence range / centrifuge test / failure mechanism

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基金资助

国家重点研发计划项目(2023YFC3007404)