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  Influence of soil-pipe relative stiffness on the behavior of buried pipelines undergoing elevation

  Longitudinal interactions of buried pipelines represent three-dimensional problems arising from many different particular situations involving a specific location of the pipeline, such as landslides, expansive soils, sinkholes, soil collapse, just to name a few. This paper aimed at developing a three-dimensional numerical evaluation of the mechanical behavior of buried pipelines undergoing elevation in a specific region of the pipe. The numerical simulations were performed using Plaxis 3D code. Parametric analyses were carried out for a few variables of the problem, such as soil relative density, pipe stiffness, soil-pipe relative stiffness and the extension of the elevated area beneath the pipeline. The results allowed for a detailed evaluation of the redistribution of stresses in the soil mass (soil arching phenomenon).

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