Polymer Culvert Liner Response to External Water Pressure Considering Buoyancy and Non-Circular Geometry
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Authors
Tara, Mohammadamin
Date
Type
thesis
Language
eng
Keyword
Culvert , Liner , Buoyancy , Water Pressure
Alternative Title
Abstract
Although CIPP is one the most reliable methods for trenchless rehabilitation of old pipes, little research has been conducted in regard to the rehabilitation of culverts using CIPP considering the impacts of shallow cover, where the water pressure increases with depth lead to significant buoyancy. Buckling is one of the important strength limits for liners under groundwater pressure and solutions exist for expected buckling pressure. Solutions also exist for bending moment and hoop force induced by the external groundwater pressure, permitting assessment of the potential for yield. However, all these available solutions were formulated considering deeply buried structures, where pressure variations between the crown and invert are neglected. Furthermore, they were developed for nearly circular sewer geometry, and do not encompass the ellipse shapes used in some corrugated steel culverts.
The goal of this study is to develop an analysis that incorporates buoyancy and to examine the impact of buoyancy on buckling pressure, moment, and thrust, for circular and elliptical culvert structures.
Using 38 example cases involving liners loosely fitting within a host pipe, and 36 example cases involving liners in elliptical host pipes, it was demonstrated that one of the liner buckling solutions of Thépot provides effective estimates of critical external water pressure at the invert. The same example cases were used to assess the performance of Thépot’s solutions for moment and thrust in the liner. New correction factors are proposed to modify those solutions for elliptical host pipe geometry so they provide moment and thrust estimates that are close to finite element calculations.
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ProQuest PhD and Master's Theses International Dissemination Agreement
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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.