山区滑坡管道应力磁检测技术

滑坡灾害导致的山区管道局部应力集中严重威胁油气管道的安全运行。而现有技术难以确定滑坡管道局部应力集中位置及其严重程度,亟需一种滑坡管道应力集中检测与评价方法。因此,提出了一种埋地管道应力磁检测技术,用于确定滑坡管段的局部应力集中位置,并提出了应力状态评估方法。将该技术应用到中石油某长输支线滑坡管道,然后利用金属磁记忆检测手段对应力磁检测结果进行了验证。结果表明:磁场梯度模量与管道应力状态存在密切联系,利用应力磁检测技术可以有效识别滑坡管道局部应力集中位置,现场开挖检测结果验证了该技术的可行性与准确性。

Research on Magnetic Detection Technology of Pipeline Stress in Mountain Landslide

The local stress concentration of mountain pipelines caused by landslide disasters seriously threatens the safe operation of oil and gas pipelines. However, in the prior art, it is difficult to determine the location and severity of the local stress concentration of a landslide pipeline, and a method for detecting and evaluating the stress concentration of a landslide pipeline is urgently needed. Therefore, this paper proposes a buried pipeline stress magnetic detection technology to determine the local stress concentration location of the landslide pipe section, and proposes a stress state assessment method. The technology was applied to a landslide pipeline of a long-distance transportation branch of PetroChina, and then the magnetic memory detection method was used to verify the stress magnetic detection results. The results show that there is a close relationship between the magnetic field gradient modulus and the pipeline stress state. The use of stress magnetic detection technology can effectively identify the local stress concentration location of the landslide pipeline. The excavation site verification results verify the feasibility and accuracy of the evaluation method.