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[1]邱春斌.隧道穿越段变形管道应力评估及应对措施[J].油气储运,2024,43(09):1-12.
　QIU Chunbin.Stress assessment and response measures for deformed pipeline through tunnel[J].Oil & Gas Storage and Transportation,2024,43(09):1-12.

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隧道穿越段变形管道应力评估及应对措施

《油气储运》[ISSN:1000-8241/CN:13-1093/TE] 卷: 43 期数: 2024年09期页码: 1-12 栏目: 出版日期: 2024-09-25

Title:: Stress assessment and response measures for deformed pipeline through tunnel

作者:: 邱春斌

Author(s):: QIU Chunbin

关键词:: 油气管道; 隧道; 穿越; 变形; 初始应力评估; 应力监测; 非动火治理

Keywords:: pipeline through tunnel; deformation; initial stress assessment; stress monitoring; non-hot work

分类号:: TE88

文献标志码:: A

摘要:: 【目的】山岭隧道穿越对于长输油气管道工程较为常见，当隧道内管道约束或补偿不足时，在输送内压与温度作用下，管道易发生较大变形，开展隧道穿越段变形管道应力评估显得尤为必要。【方法】综合利用理论计算、管道超声应力监测及有限元分析3种方法，对隧道穿越段变形管道应力进行计算；基于管道应力计算结果，合理布设管道应力监测点，高频动态监控隧道穿越段变形管道应力变化情况；基于管道应力动态监测数据，采用分阶段梯次释放管道应力的治理措施；根据治理前管道应力计算结果与治理中管道应力变化量（即管道应力监测数据），计算治理后的管道应力，从而评估管道的安全裕量。【结果】将方法应用于国家管网集团西部管道公司某隧道穿越段变形管道，应力评估发现变形管道处于高应力水平，应力集中点位于隧道入口和出口段管道处，在运行压力12 MPa、运行温度40 ℃的设计工况下，隧道出口处管道焊缝的当量应力占屈服应力比例为93.87%，不满足管道当量应力不大于0.9倍屈服应力的安全要求。通过非动火治理后，隧道入口段管道当量应力安全裕量由68.50 MPa增至181.14 MPa，而隧道出口段则由47.50 MPa增至183.66 MPa，应力释放效果较好。【结论】研究结果有助于长输油气管道隧道穿越段的设计及监测方案的制定。

Abstract:: [Objective] Mountain tunnel crossing is very common in long distance oil and gas pipeline engineering. When the pipeline in the tunnel is constrained or compensated insufficiently, the pipeline is prone to large deformation under the action of internal pressure and temperature. Based on the initial stress assessment technology and stress monitoring technology of pipeline, the paper carries out practical research on the treatment of deformed pipeline in the tunnel crossing section under non-explosive conditions, so as to eliminate the stress risk of pipeline under the condition of continuous transport. [Methods] The current stress of the deformed pipe in the tunnel crossing section is calculated by three methods: theoretical calculation before treatment, ultrasonic stress detection and finite element analysis of pipe stress. Based on the current stress distribution of the pipeline, the stress monitoring point of the pipeline is rationally arranged, and the stress change of the deformed pipeline in the tunnel crossing section is dynamically monitored with high frequency. Based on the dynamic monitoring data of pipeline stress, the stress of pipeline is released step by step. After treatment, according to the current stress of the pipeline before treatment and the stress variation of the pipeline during treatment (pipeline stress monitoring data), the current stress of the deformed pipeline in the tunnel crossing section after treatment is calculated, and the pipeline safety margin is evaluated. [Results] The proposed method is applied to a deformed pipeline in a tunnel crossing section of the Northwest Company of the National Pipeline Network Group. The stress assessment results show that the deformed pipeline is at a high stress level and the high stress concentration points are located at the entrance and exit sections of the tunnel pipeline. The equivalent stress of the pipeline at the tunnel outlet accounts for 93.87% of the yield stress under the design condition with operating pressure of 12MPa and operating temperature of 40 ℃, which does not meet the safety requirement that the equivalent stress of the pipeline should not exceed 0.9 times the yield stress. Through the non hot work treatment, the equivalent stress safety margin of the tunnel entrance section pipeline increases from 68.50 MPa to 181.14 MPa, while the tunnel exit section increases from 47.50 MPa to 183.66 MPa, indicating a better stress release effect. [Conclusion] The pipeline stress assessment thchniques involving the measured elevation based calculation of pipeline vertical bending stress, the ultrasonic stress detection, and the finite element analysis, as well as the high-frequency stress monitring data based phased release method of pipeline stress have achieved good results in stress assessment and treatment of deformed pipelines in tunnel crossing sections. The study can provide technical reference for the application of this technology route in stress assessment and treatment of deformed pipelines in tunnel crossing sections.

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更新日期/Last Update: 2024-06-25