Abstract
Cured-in-place linings (CIPLs) are flexible fiber-reinforced polymer linings used to rehabilitate aging pipelines in situ. They also can strengthen utilities against transient and permanent ground deformation caused by earthquakes, thus providing added value through seismic retrofitting. This paper presents the results of full-scale fault rupture tests to characterize the debonding, axial elongation, and bending performance of pipelines with circumferential cracks and weak joints strengthened with CIPLs and subjected to abrupt ground deformation. The results of finite-element simulations were compared with the experimental fault rupture response of jointed pipelines with and without CIPL reinforcement. The results of a numerical model that accounts for debonding between the lining and pipe as Mode II fracture propagation were in good agreement with full-scale fault rupture test results. Recommendations are made for applying the modeling and experimental results for in situ strengthening of underground utilities against earthquakes and other sources of permanent ground deformation.
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Acknowledgments
The work reported in this paper was supported by the National Science Foundation (NSF) under Grant No. CMMI-1041498. Any opinions, findings and conclusions or recommendations expressed in this paper are those of authors and do not necessarily reflect the views of the NSF. The authors thank T. Bond and Dr. D. Bouziou for their contributions to the preparation of large-scale tests. Sincere thanks to Progressive Pipeline Management, most notably M. Carbone, for providing and installing the CIPLs, and to the Los Angeles Department of Water and Power, including Dr. C. Davis, A, Gastellum, and Dr. J. Hu, for supplying the DI specimens.
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 145 • Issue 3 • March 2019
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©2019 American Society of Civil Engineers.
History
Received: Sep 14, 2017
Accepted: Sep 5, 2018
Published online: Jan 11, 2019
Published in print: Mar 1, 2019
Discussion open until: Jun 11, 2019
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