Loading...

Parametric Investigation of the Behavior of Buried Pipelines under Reverse-Oblique Faulting

Baie, Reza | 2011

394 Viewed
  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 41886 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Rahimzadeh Rofooei, Fayyaz
  7. Abstract:
  8. Buried pipelines are among the most important elements of lifelines that are used for distribution of water, gas, petroleum, etc. Previous studies indicate that the severe damages that resulted in complete disruption of pipelines, is mainly due to permanent ground displacement caused by faulting. Previous studies on this subject have mostly focused on strike-slip and normal faulting. Since it is reported that damages due to reverse faulting can be more severe than damages caused by normal faulting, a comprehensive study on the behavior of buried pipelines subjected to reverse faulting is needed. In this thesis, the effect of various parameters including burial depth, pipe diameter, pipe wall thickness to diameter ratio, internal friction angle of soil, fault dip-angle, horizontal faulting angle, and the fault trace-pipe angle on the behavior of steel and high density polyethylene (HDPE) pipes, subjected to reverse and reverse-oblique faulting were investigated through a rigorous 3-D modeling of pipe-soil medium. Surrounding soil medium was modeled with 3-D solid elements and pipe-soil interaction was considered using Penalty model for tangential behavior and Hard Contact for normal behavior. For parametric studies, analyses were carried out using ABAQUS 6.10.1. Faulting dip-angle of 60, 75, 90 degrees and faulting horizontal angle of 0, 27, 45, 63, and 90 degrees were considered. Results show that the most important phenomenon that controls the behavior of buried pipelines due to reverse and reverse-oblique faulting is local buckling and the most effective parameter related to local buckling is pipe wall thickness (or diameter to wall thickness ratio). It is shown that increasing the pipe diameter, wall thickness and reduction in soil internal angle of friction, burial depth, and horizontal faulting angle will result in better performance of the buried pipeline
  9. Keywords:
  10. Buried Pipline ; Permanent Ground Deformation (PGD) ; Soil-Pipe Interaction ; Reverse Oblique Faulting

 Digital Object List

 Bookmark

No TOC