Numerical Study on Soil-Hdpe Pipeline Interaction Subjected to Permanent Ground Deformation

Abstract eng:
Earthquake-induced Permanent Ground Deformation (PGD) could be occurred due to fault movements, land sliding and also liquefaction-induced soil displacements. This kind of deformation can significantly affect underground lifelines, such as buried gas pipelines. To assess the integrity of the pipelines against fault deformation, it is important to quantitatively evaluate the interaction between the pipelines and the surrounding soil. The simplified analysis procedures for buried pipelines crossing active faults consider a bilinear force-displacement relationship curve to represent the soil-pipeline interaction specified in the major seismic design guidelines for pipelines. In a case of fault’s large movement or existing relatively soft soil, the soil adjacent to the pipe could behave in a nonlinear fashion and affects the pipe’s response and also changes the pipeline-soil interface behavior significantly. In this study, the effect of the soil non-linearity as well as geometric and material non-linearity in soil-pipe interaction due to large ground deformation on the earthquake-resistance of buried pipelines were investigated. A new hybrid approach was developed to reduce the number of degrees of freedom of the soil-pipeline system accounting for real soil-pipeline interaction. The approach combines the finite-element method (FEM) modeling the pipeline and near-field soil around the pipe and the consistent infinitesimal finite-element cell method (CIFECM) to represent the far-field soil around the pipe. The pipeline near fault is modeled using large deformation shell elements, while the segment located far away from the fault, is considered as elastic beam elements. The developed method was used to evaluate the maximum strains for the fault-crossing steel and High Density Polyethylene (HDPE) pipes subjected to various fault movements. Parametric responses for different fault crossing angles and pipe diameters are presented.

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