Predicting Soil Expansion Force during Static Pipe Bursting Using Cavity Expansion Solutions
Publication: International Journal of Geomechanics
Volume 16, Issue 3
Abstract
The prediction of total pull force is critical for static pipe-bursting installation. As a major component of the total pull force, soil expansion prediction is also important; however, there are currently limited methods available for such prediction. In this paper, three cavity expansion solutions were used to predict soil expansion pressure acting upon the expander (bursting head) during static pipe bursting. The determined soil expansion pressure was then used to calculate the expansion force required for pipe bursting with or without consideration of the soil collapse. Calculated results were then compared with those from laboratory pipe-bursting experiments to evaluate the feasibility of the calculation methods. The comparison indicated that the large-strain cavity expansion solution reasonably predicted the soil expansion force. The small-strain solution significantly overestimated the soil expansion force. Additionally, considering soil collapse during pipe bursting resulted in a remarkably higher calculated expansion force than that without consideration; in this study, the soil collapse effect should be taken into account because a sandy soil was used in the laboratory experiments.
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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 financial support. The authors also thank the Consortium for Engineered Trenchless Technologies (CETT), University of Alberta, for providing this research opportunity, and Ms. Lauren Wozny at CETT for editorial review of this paper.
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Information & Authors
Information
Published In
International Journal of Geomechanics
Volume 16 • Issue 3 • June 2016
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Sep 3, 2014
Accepted: Jul 15, 2015
Published online: Dec 7, 2015
Discussion open until: May 7, 2016
Published in print: Jun 1, 2016
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