Response of buried polyethylene natural gas pipelines subjected to lateral ground displacement
department or school: Applied Science, Faculty of
department or school: Civil Engineering, Department of
data provider: DSpace
degree campus: UBCV
creator: Anderson, Christopher D.
issued: 2009-11-21T01:09:54Z
issued: 2004
related degree: Master of Applied Science - MASc
degree grantor: University of British Columbia
description: Permanent ground deformations (PGD) are a major cause o f damage to buried natural gas pipeline systems, particularly in areas of ongoing ground deformation. A new testing apparatus was designed and constructed specifically to meet the requirements of full-scale physical modeling research on typical polyethylene natural gas pipeline configurations subjected to lateral ground displacements. The apparatus essentially comprised a large soil testing chamber in which pipeline configurations could be monitored with an instrumentation array measuring pullout resistance, pipeline displacement, and local strain within the pipe specimens. Specialized methods were developed for mounting strain gauges to polyethylene to obtain reliable readings, and to reduce imposed drag forces. A series of tests performed on straight pipeline sections indicated that peak axial pullout resistance predicted using published design equations tended to over-predict pullout resistance of polyethylene pipes in uncompacted sand, and to underestimate pullout resistance in dense sand. Significant limitations were found in the applicability of current design equations, developed from tests on rigid steel pipelines, to the prediction of axial pullout resistance of relatively "flexible" polyethylene pipelines. Several soil-pipeline interaction mechanisms have been suggested that seem to account for the observed differences in behaviour between polyethylene and steel pipelines. Axial tests on trunk lines with tee connections to smaller size branch pipes indicated that branched configurations experience a complex interaction with the soil. The branch pipe initially deflected and elongated in close proximity to the tee connection, then with increasing displacement, pipe deformation transitioned to axial pullout of the branch. The contribution to pullout resistance from the branches was similar in both uncompacted and dense sand, and also was not significantly affected by the diameter of the trunk line. The a…
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/15404
extent: 27712000 bytes
format: application/pdf
note: RESPONSE OF BURIED POLYETHYLENE NATURAL GAS PIPELINES SUBJECTED TO L A T E R A L GROUND DISPLACEMENT B y Chris topher D . Anderson r-B . A . S c , Un ive r s i ty o f B r i t i s h C o l u m b i a , 1998 A THESIS S U B M I T T E D I N P A R T I A L F U L F I L L M E N T O F T H E R E Q U I R E M E N T S F O R T H E D E G R E E O F M A S T E R O F A P P L I E D S C I E N C E i n T H E F A C U L T Y O F G R A D U A T E S T U D I E S Department o f C i v i l Eng inee r ing W e accept this thesis as conforming to the required standard T H E U N I V E R S I T Y O F B R I T I S H C O L U M B I A A p r i l 2 0 0 4 © Chris topher D . Anderson , 2 0 0 4 Library Authorization In presenting this thesis in partial fulfillment of the requirements for an advanced degree at the University of British Columbia, I agree that the Library shall make it freely available for reference and study. I further agree that permission for extensive copying of this thesis for scholarly purposes may be granted by the head of my department or by his or her representatives. It is understood that copying or publication of this thesis for financial gain shall not be allowed without my written permission. Ofr&sroVH&g. D . AVVGH&OM %3 /of/Zoo^ Name of Author (please print) Date (dd/mm/yyyy) Title of Thesis: H BSVO^SS O F 1$UQ-I&?> To<-r & T ^ ^ ^ ^ e ^ATIA^U D e S r e e : MASTERS OF AVPU&I> ^ g g ^ g Department of Q.w^ f / u g i ^ g i ^ The University of British Columbia Vancouver, BC Canada Year: ^ G O f ABSTRACT Permanent ground deformations ( P G D ) are a major cause o f damage to bur ied natural gas pipel ine systems, par t icular ly in areas o f ongo ing ground deformation. A new testing apparatus was designed and constructed specif ical ly to meet the requirements o f fu l l -scale phys ica l mode l i ng research on typica l polyethylene natural gas pipel ine configurations subjected to lateral ground displacements. The apparatus essentially comprised a large so i l testing chamber i n w h i c h …
has type: Thesis/Dissertation
date issued: 2004-05
is shown at: 10.14288/1.0063479
language: eng
degree discipline: Civil Engineering
provider: Vancouver : University of British Columbia Library
publisher: University of British Columbia
rights: For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
scholar level: Graduate
type: Text
identifier URI: http://hdl.handle.net/2429/15404