|Title||Ovalization of steel energy pipelines buried in saturated sands during ground deformations|
|Author||Dadfar, B D; El Naggar, H E N; Nastev, M N|
|Source||Computers and Geotechnics 69, 2015 p. 105-113, https://doi.org/10.1016/j.compgeo.2015.05.004|
|Alt Series||Earth Sciences Sector, Contribution Series 20150108|
|Media||paper; on-line; digital|
|Subjects||geophysics; mathematical and computational geology; soil mechanics; displacement; pipelines; Buried steel pipes; saturated sand; ovalization; finite element analysis|
|Illustrations||equations; graphs; tables|
|Program||Quantitative risk assessment project, Public Safety Geoscience|
|Abstract||Cross-sectional ovalization of buried steel pipes subjected to bending moment induced by end displacements is discussed. A three dimensional finite element analysis was conducted employing Abaqus/CAE.
The pipe was simulated using 3D shell elements while the saturated sand soil medium was simulated by employing discrete nonlinear springs along the pipeline. The effects of normalized burial depth (H/D), diameter to wall thickness ratio (D/t), sand
density and level of the internal pressure on the ovalization are investigated, and resulting ovalization distribution with respect to bending moment at critical sections is presented. The results of this study enable simple one dimensional finite
element models to consider geometrical cross-sectional nonlinearities in the analysis of buried pipelines.|
|Summary||(Plain Language Summary, not published)|
Cross-sectional ovalization of buried steel pipes subjected to bending moment induced by end displacements is discussed. Non-dimensional functions were
developed for saturated loose and dense sands which can be used in simple linear models of pipelines used for transport of oil and gas.