Centrifuge Modeling and Digital Image Cross-Correlation Analysis of Geofiber-Reinforced Clay-Based Landfill Covers
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 143, Issue 1
Abstract
The influence of discrete and randomly distributed fibers (DRDF) on the improvement of the resistance to cracking of clay-based landfill covers was studied by conducting a series of centrifuge model tests. A motor-based differential settlement simulator (MDSS) was used to induce differential settlements to the soil layers during centrifuge tests performed at using the 4.5 m radius beam centrifuge at Indian Institute of Technology Bombay. A digital image cross-correlation (DIC) technique was used to capture deformations of the model barriers and to obtain strain field distributions. Thickness of the unreinforced barriers (URSB) and fiber-reinforced barriers (FRSB) were varied as 15 mm (similar to 0.6 m in the field) and 25 mm (1.0 m). Fiber lengths were varied as 30, 60, and 90 mm. The strain at water breakthrough of 15 mm (0.6 m) and 25 mm (1 m) FRSB were respectively 1.9 and 2.2 times higher compared to identical URSBs. A relatively crack-free surface was observed for FRSB with longer fibers even after subjected to differential settlement of 1 m.
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Acknowledgments
This research was supported by the Indo-French Collaboration for Advanced Research (IFCPAR) and their support is highly acknowledged. Thanks are also due to German Academic Exchange Service (DAAD) Bonn, Germany for their support in funding image analysis equipment used in the present study. The writers thank the staff at the Geotechnical Engineering Laboratory and National Geotechnical Centrifuge Facility (NGCF), Indian Institute of Technology Bombay, Powai, Mumbai—400 076, India for their support during the course of the study. Thanks are also due to the editor, editorial board member, and reviewers for their constructive criticism for improving the quality of the manuscript.
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 143 • Issue 1 • January 2017
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© 2016 American Society of Civil Engineers.
History
Received: Jul 1, 2015
Accepted: Apr 25, 2016
Published online: Jul 20, 2016
Discussion open until: Dec 20, 2016
Published in print: Jan 1, 2017
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