Abstract
This paper explores the possibility of using high-resolution fiber-optic distributed sensing for in situ geotechnical estimation of soil shear modulus distribution with depth. It is shown that a recursive analysis of an elastic problem together with a measured vertical strain can assist in evaluating the sought stiffness values. It is suggested that high-resolution fiber-optic distributed sensing can provide the necessary strain for the proposed process. The approach was demonstrated in a field trial, entailing a stratified soil profile including a thin sand layer encapsulated between two clay layers. Results of the suggested profiling method are compared against data from a geophysical survey and against correlations with conventional in situ testing. Excellent agreement is exhibited between the different methods, indicating aptitude and viability of the idea for implementation as a geotechnical investigative tool.
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Acknowledgments
The authors wish to thank Shapir Engineering Ltd and Noam Weinstein from the National Road Company of Israel for permitting the field trial. They also wish to thank Admir Technology Ltd for allowing the use of their wick drain installation machine. Special thanks are due to Yoav Garmi and Ziv Charas, who helped execute the field demonstration.
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 142 • Issue 8 • August 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Aug 11, 2015
Accepted: Dec 31, 2015
Published online: Apr 5, 2016
Published in print: Aug 1, 2016
Discussion open until: Sep 5, 2016
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