Abstract
Rigid pipes installed under high embankments are often installed using the induced trench technique by introducing a compressible zone above the pipe. A new application of tire-derived aggregate (TDA) for induced trench rigid pipes is evaluated in this study. An experimental investigation that has been conducted to measure the earth pressure distribution on a rigid pipe buried in granular material and backfilled with TDA is presented in this study. A setup has been designed and built to allow for the installation of an instrumented pipe in granular material and measuring the contact pressure acting on the pipe wall. Results show that the use of TDA as a compressible material can provide similar beneficial effects to rigid pipes compared to expanded polystyrene (EPS) geofoam and other commonly used soft inclusions. The earth pressure is found to decrease significantly all around the pipe compared to the conventional installation with aggregate backfill. The average measured earth pressure above the crown of the pipe was found to be as low as 30% of the overburden pressure for installations with granular backfill material. The pressure at the invert also decreased by about 75% with the introduction of the soft TDA zone above the pipe.
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Acknowledgements
This research is supported by a research grant from the Natural Sciences and Engineering Research Council of Canada (NSERC). The authors would like to acknowledge the support of Dr. W.D. Cook and Mr. J. Bartczak in conducting these experiments.
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Meguid, M.A. (2019). Earth Pressure Distribution on Rigid Pipes Overlain by TDA Inclusion. In: El-Naggar, H., Abdel-Rahman, K., Fellenius, B., Shehata, H. (eds) Sustainability Issues for the Deep Foundations. GeoMEast 2018. Sustainable Civil Infrastructures. Springer, Cham. https://doi.org/10.1007/978-3-030-01902-0_1
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