Estimation of Soil Expansion Force in Static Pipe Bursting: Comparison between Numerical and Analytical Solutions
Publication: International Journal of Geomechanics
Volume 17, Issue 3
Abstract
Pull-force estimation is important for the design of static pipe-bursting projects. Among the three components of the pull force, soil expansion force has a significant impact. In this study, a numerical model was employed to determine the soil expansion pressures acting on the expander during pipe bursting. The expansion pressures were used to calculate soil expansion forces, which were then compared to those calculated on the basis of a large-strain analytical cavity expansion solution and those measured from laboratory experiments. Additionally, a parametric study, using numerical modeling and the analytical solution, was conducted to examine the influence of depth of cover on the calculated expansion forces. Typical pipe geometries and soil properties in Edmonton, Alberta, Canada, were used for the parametric study. The results reveal that although the soil expansion force obtained from the analytical solution was higher than that from numerical modeling, the difference decreased when the depth of cover increased. The analytical solution can provide a conservative estimation with a maximum discrepancy of 30%.
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Acknowledgments
The authors thank the Natural Sciences and Engineering Research Council of Canada (NSERC) and the City of Edmonton for their support. The authors also thank the Consortium for Engineered Trenchless Technologies (CETT) at the University of Alberta for providing this research opportunity and Ms. Lauren Wozny, Tatiana Boryshchuk, and Sheena Moore at CETT for their editorial review of this paper.
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Information & Authors
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Published In
International Journal of Geomechanics
Volume 17 • Issue 3 • March 2017
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Jan 15, 2016
Accepted: Jun 16, 2016
Published online: Aug 5, 2016
Discussion open until: Jan 5, 2017
Published in print: Mar 1, 2017
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