Study on Improvement of Pipe-Soil Spring Model in Mountain Slope Area

For the interaction between the pipeline and the soil under the condition of large surface displacement, the displacement load is often transmitted to the pipeline through soil springs. The selection of soil spring parameters is based on laboratory research results, which may not be effective for pipe-soil interface simulation. In addition, the load and soil spring coefficient of the pipeline in the slope should vary with space and time, and these factors are ignored by the resistance formula of the current general spring model. The adaptability and temporal load distribution of the pipe-soil spring model in regions of large surface deformation are largely unknown. In this paper, we deduced the soil spring resistance formula when the surface is inclined, established an improved soil spring model for the slope, and obtained the variation law of soil spring resistance in different directions at different slope angles. At the same time, a comparison of the improved soil spring model with the standard soil spring model recommended by international associations and codes was carried out. The rationality of the improved soil spring model proposed in this paper in the calculation of the pipe-soil interaction in the slope section is further verified by small-scale physical model tests. It has a certain guiding significance for the calculation of pipe-soil interaction in slope sections.