Research on the Axial Stress Distribution Law of Mountain Pipeline Under the Action of Lateral Landslides

This article studies the distribution law of axial stress in mountain pipelines under the action of lateral landslides. Firstly, a mechanical model is established for analysis, taking into account the geometric nonlinearity of the pipeline and the physical nonlinearity of the longitudinal resistance of the soil outside the landslide. The theoretical calculation method for the axial stress of the pipeline under two conditions of tension or pressure is obtained, and the calculation formula for the axial stress of mountain pipelines under the action of lateral landslides is summarized. The finite element method was used to simulate and calculate buried pipelines affected by lateral landslides based on nonlinear contact problems. The single variable method was used to analyze the influence of soil parameters, landslide body parameters, mountain body parameters on both sides, and some other parameters on the axial stress of mountainous pipelines. The axial stress distribution of buried pipelines under different influencing factors was analyzed, and the axial stress distribution in four different directions of pipelines 0, 3, 6, and 9 was obtained, Analyze the variation pattern of axial stress in the pipeline at the location of stress concentration, and the results indicate that stress concentration occurs in the pipeline at the middle and edge positions of landslide displacement; According to the relationship between the axial stress of the pipeline and various influencing factors, the relationship between the maximum axial stress of the pipeline and a single factor is fitted, and the axial stress distribution law of the mountain pipeline under the lateral landslide effect is finally obtained.