Abstract
Large-scale direct shear tests were carried out to explore the shear behavior of the ballast-subballast interface with and without the inclusion of geogrids. Fresh granite ballast and subballast with an average particle sizes (D50) of 42 mm and 3.5 mm respectively, and triaxial geogrids with different aperture sizes were used in this study. Tests were performed at different normal stresses (σn) ranging from 20 to 100 kPa at a constant shearing rate (Sr) of 2.5 mm/min. The experimental results reveal that the shear strength of the ballast-subballast interface improved significantly with the inclusion of geogrids. The interface efficiency factor (α), defined as the ratio of the shear strength of ballast-geogrid-subballast interface to the shear strength of ballast-subballast varies from 1.15 to 1.17 and the ballast-geogrid-subballast friction angle (φ) lies in the range of 51.1° to 67°. These test results emphasize the role of triaxial geogrids in stabilizing the ballasted rail tracks and thus reducing the maintenance cost.
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Sweta, K., Hussaini, S.K.K. (2018). Performance Evaluation of Ballast-Subballast Interface Stabilized with Geogrids. In: Wu, W., Yu, HS. (eds) Proceedings of China-Europe Conference on Geotechnical Engineering. Springer Series in Geomechanics and Geoengineering. Springer, Cham. https://doi.org/10.1007/978-3-319-97115-5_182
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DOI: https://doi.org/10.1007/978-3-319-97115-5_182
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