Effects of Erosion Void on Deteriorated Metal Culvert before and after Repair with Grouted Slip Liner
Publication: Journal of Pipeline Systems Engineering and Practice
Volume 10, Issue 4
Abstract
A corroded corrugated steel pipe was buried with an erosion void simulated from the haunch to the shoulder on one side. Testing under simulated service loads revealed that the void appeared to compromise the stability of the structure at a load of 87% of the full service load. Changes in curvature under load in the springline adjacent to the simulated erosion void were about 3 times higher than those at the springline with soil support. Compressive wall thrusts were also substantially higher on the side adjacent to the erosion void. The culvert was then rehabilitated using a grouted slip liner. A steel-reinforced high-density polyethylene pipe was used together with low-density, low-strength grout. Stiffness after rehabilitation was enhanced considerably, with diameter changes at full service loads decreased by an order of magnitude. Strains in the corrugated steel pipe were also much lower. Strains measured on the corrugated steel pipe and on the steel ribs of the steel-reinforced polyethylene pipe suggest that below 300 kN, the grout had not fractured, and the steel pipe, grout, and liner within responded as a composite system. Above 300 kN, the grout appears to have fractured, and strains in the steel pipe and liner accelerated with applied load. The ultimate limit state appears to correspond to development of full plastic hinges in the steel ribs of the liner at the crown, the springlines, and the invert. The structural repair based on grouted slip lining was found to be more than adequate, because the force applied to the single axle at the ultimate limit state was well beyond the full factored load requirements for these structures.
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Acknowledgments
This research was funded by the National Cooperative Highway Research Program (NCHRP) through the Transportation Research Board of the National Academy of Sciences, Washington DC. The findings, conclusions, or recommendations expressed in this paper do not necessarily reflect the views of the sponsors. The first author’s PhD studies at Queen’s University were also funded through a Strategic Research Grant provided by the Natural Sciences and Engineering Research Council of Canada. The authors thank Graeme Boyd for his excellent technical support, and are also grateful for assistance in the laboratory provided by Alex Burnett, Katrina MacDougall, Eric Poon, and Bryan Simpson. The development of the testing facilities at Queen’s University was supported by funding from the Canada Foundation for Innovation (CFI), the Natural Sciences and Engineering Research Council of Canada (NSERC), and the government of Ontario. The authors thank Darrell Sanders of Contech Engineering Solutions for donation of the steel-reinforced polyethylene test pipe; Tony Angelo of the 407 ETR who provided the corroded steel pipe sample; and Michel Lessard, Bill Corradetti, John Vye, and Danny Salvo from Euclid Chemical who assisted with supply of the aeration agent and preparation of the lightweight grout.
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©2019 American Society of Civil Engineers.
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Received: Jul 4, 2018
Accepted: Feb 26, 2019
Published online: Aug 22, 2019
Published in print: Nov 1, 2019
Discussion open until: Jan 22, 2020
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