Estimation of Maximum Annular Pressure during HDD in Noncohesive Soils
Publication: International Journal of Geomechanics
Volume 17, Issue 4
Abstract
This study investigated the effectiveness of estimating the maximum allowable annular pressure during horizontal directional drilling (HDD) in noncohesive soils by using two theoretical cavity-expansion solutions (small strain and large strain); several laboratory and field tests were used for verification. The results indicated that the measurements were overestimated when using the plastic radius equal to two-thirds of the overburden depth and underestimated when using the hoop strain equal to 2%. Although the calculated limit pressures based on the two cavity-expansion solutions were higher than the measured failure pressures, a high correlation (R2 = 0.96) existed between the measurements and the calculations based on the large-strain cavity-expansion solution. This correlation may be used to estimate the maximum allowable annular pressure during HDD in noncohesive soils, provided that further validation is conducted with more field data for deep depths rather than shallow depths.
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Acknowledgments
The authors acknowledge the Natural Sciences and Engineering Research Council of Canada (NSERC) for supporting this study. They also extend appreciation to the Consortium for Engineered Trenchless Technologies (CETT) at the University of Alberta for providing this research opportunity, and to Ms. Tatiana Boryshchuk and Sheena Moore at CETT for editorial assistance with this paper.
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© 2016 American Society of Civil Engineers.
History
Received: Sep 10, 2015
Accepted: Aug 1, 2016
Published online: Sep 12, 2016
Discussion open until: Feb 12, 2017
Published in print: Apr 1, 2017
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