Numerical modelling for buckling of buried pipelines induced by compressive ground failure

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Abstract
The beam mode of buckling and the local shell mode of buckling of a buried pipeline induced by compressive ground failure, and their interactions are investigated numerically. The present results possess satisfactory comparisons with actual case histories. The numerical results show that the buckling behavior of the buried pipe is influenced by the ratio of pipe diameter to thickness, buried depth, initial imperfection, soil‐pipe friction, and soil foundation. The soil‐pipe friction induces the snap through buckling of beam mode of buckling. The limit loads for the beam mode of buckling are larger for pipes with smaller imperfection heights, larger pipe diameters, deeper buried depths, higher soil‐pipe frictions, and stiffer foundations. The critical buried depth that separates the beam mode of buckling and local shell mode of buckling is deeper for pipes with a smaller ratio of pipe diameter to thickness, smaller imperfection, and softer foundation. The relations of critical buried depth versus ratio of pipe diameter to thickness for buried pipes with different imperfections and various soil foundations are established.

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