Abstract
Offshore pipelines are frequently subjected to the impact of submarine landslides or debris flow, causing large displacement and increase in internal forces. The damage of pipeline has been vastly reported and the pipeline behavior subjected to landslide has also been explored by many researchers. The impact of landslide on pipeline is commonly assumed to be static problem. However, the displacing process of the pipeline under the active landside loading is a kinematic procedure. This work attempts to explore the kinematic process of pipeline based on the vector form intrinsic finite element method. It is found that when the displacement is firstly triggered, it increases very quickly. With the increase of lateral soil resistance and the development of internal forces, the displacement gradually decreases and stabilizes. The comparison with the analytical model reveals obvious difference in tension distribution along the pipeline. Moreover, detailed analysis on the influence of landslide impaction location and the initial pipeline shape is included in the parametric analysis.
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