Structural Performance of Cast-In-Place Pipe Liners at Perforations and Ring Fractures in the Host Pipe
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Authors
Qiu, Ranlin
Date
Type
thesis
Language
eng
Keyword
CIPP , FEA , Pipe Rehabilitation
Alternative Title
Abstract
The objective of this research project is to evaluate the structural performance of Cast-In-Place Pipe (CIPP) liners for pressure pipes, around areas of deterioration in the host pipe, specifically perforations and ring fractures.
To evaluate the liner behaviour around perforations in a host pipe, an investigation using finite element analysis (FEA) was undertaken. The constructed FEA model was evaluated against data from previous physical experiments conducted on CIPP lined metal pipes with idealized circular perforations, and the model was improved iteratively. It was found that the model was capable of capturing peak strains but failed to properly estimate the strain distribution at the edge of the perforation. The new FEA model was then used to investigate the behaviour of CIPP liners spanning across oval shaped perforations. The FEA simulation showed that the oval shaped perforation with long diameter of 50 mm and short diameter of 25 mm has strain readings that are in-between the strain readings of 25 mm and 50 mm circular perforation.
Secondly, a series of full-scale physical experiments were undertaken to develop procedures for testing CIPP rehabilitated pipe samples with a ring fracture under pure axial tension. A set of two lined specimens with idealized ring fractures were designed, fabricated and were used to evaluate the testing procedure. Distributed Fibre Optic Sensing (DFOS) were used to monitor the strain change in the liner throughout the loading process in an attempt to estimate the debonded length of the liner. A special instrumentation method was designed and utilized to install the fibre optic cables onto the sample due to physical constraints. Two experiments were conducted: an Unpressurized test and a Pressurized test. The Unpressurized test results indicated that the debonded length of the liner was much shorter than predicted with closed-form solution due to better than expected adhesion between the liner and the pipe. Similar results were seen in the measured gap opening for the Pressurized pipe. A number of challenges meant that neither test was able to fully capture the behaviour of the lined system but recommendations for future improvements will enable further work to investigate this behaviour.
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ProQuest PhD and Master's Theses International Dissemination Agreement
Intellectual Property Guidelines at Queen's University
Copying and Preserving Your Thesis
This publication is made available by the authority of the copyright owner solely for the purpose of private study and research and may not be copied or reproduced except as permitted by the copyright laws without written authority from the copyright owner.