滑坡对纵向埋地管道的变形特征与减灾对策研究

纵向布置作为埋地管道跨越山区地形的主要方式之一,滑坡对其致灾模式与横向布置埋地管道存在显著差异,横向布置埋地管道的变形机制和减灾对策并不适用于纵向布置的埋地管道。本文采用ABAQUS有限元软件研究埋地管道承载纵向滑坡作用的变形破坏规律,分析滑坡几何形态对管道变形破坏规律的影响,探讨改变管道径厚比、埋深、内压值对减小埋地管道受滑坡作用变形破坏的效果。研究结果表明：①埋地管道遭受滑坡作用最大的应变发生在滑坡坡脚管段；②埋地管道应变随滑坡坡度、厚度、长度增大而增大,其中滑坡厚度对管道遭受滑坡作用变形破坏影响程度最大,其次是滑坡长度,最后是滑坡坡度；③减小管道径厚比、埋深、内压都能有效增强管道的抗灾能力,从管道施工难易程度、成本、减灾效果以及运营管理四个方面考虑,最佳方案是减小管道的径厚比,其次是改变管道内压,最后是改变管道的埋深。

Study on Deformation Characteristics and Disaster Reduction Countermeasures of Longitudinal Buried Pipeline under landslides

As one main type of buried pipeline passes through the mountain areas, the disaster-causing mode of longitudinally buried pipelines subjected to landslide has a significant difference compares to that of the horizontal buried pipelines caused by landslides. the deformation mechanism and disaster reduction countermeasures of horizontally arranged buried pipelines are not suitable for longitudinally arranged buried pipelines.In this paper, ABAQUS finite element software is used to study the deformation and failure law of buried pipeline under the action of longitudinal landslide, and the influence of landslide geometry on the deformation and failure of a pipeline is analyzed. The effect of changing the diameter-thickness ratio, buried depth, and internal pressure on reducing the deformation and failure of buried pipelines caused by a landslide is discussed. The results show that: (1) the maximum strain of buried pipeline affected by landslide occurs in the toe section of the landslide. (2) the strain of buried pipelines increases with the increase of slope, thickness, and length of landslide. among them, the thickness of landslide has the most influence on the deformation and failure of pipelines subjected to landslide, followed by the length of landslide, and finally the slope of landslide. (3) Reducing the diameter-thickness ratio, buried depth and internal pressure of the pipeline can effectively enhance the strength of the pipeline. considering the difficulty of pipelines construction, cost, disaster reduction effect, and operation management, the best plan is to reduce the diameter-thickness ratio of the pipeline, the second is to change the internal pressure of the pipeline, and finally to change the buried depth of the pipeline.