Behavior of Geogrid-Sand Interface in Direct Shear Mode
The contribution of transverse ribs to the soil-geogrids interaction under pullout mode has been well documented. However, the contribution of transverse ribs to the soil-geogrid interaction under direct shear mode is, at best, unclear. Consequently, this paper presents the results of a comprehensive direct shear testing program aimed at evaluating the contribution of transverse ribs to the interface shear. The direct shear tests involved Ottawa sand and several polyester geogrids with a variety of material tensile strength, percent open area, and aperture pattern. The test results show that the shear strength of sand-geogrid interfaces under direct shear mode is significantly higher than that of sand-geotextile interfaces. Analysis of shear displacement-strength response of the interfaces indicates that, in addition to interface shear components due to sand-rib friction and sand-sand shear at the location of the openings, the transverse ribs provide additional contribution to the overall sand-geogrid interface resistance. Specifically, analysis of the results reveals that the transverse ribs of the geogrid used in this study provide approximately 10% of interface shear resistance. This contribution is positively correlated with the tensile strength and the stiffness of geogrid ribs, but is negatively correlated with the percent open area of the geogrid. A simple model is proposed to quantify the contribution of transverse ribs to the interface shear strength under direct shear mode.
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Availability:
- Find a library where document is available. Order URL: http://worldcat.org/oclc/35194342
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Authors:
- Liu, Chia-Nan
- Zornberg, Jorge G
- Chen, Tsong-Chia
- Ho, Yu-Hsien
- Lin, Bo-Hung
- Publication Date: 2009-12
Language
- English
Media Info
- Media Type: Print
- Features: Figures; Photos; References; Tables;
- Pagination: pp 1863-1871
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Serial:
- Journal of Geotechnical and Geoenvironmental Engineering
- Volume: 135
- Issue Number: 12
- Publisher: American Society of Civil Engineers
- ISSN: 1090-0241
- Serial URL: http://ojps.aip.org/gto
Subject/Index Terms
- TRT Terms: Geogrids; Geosynthetics; Interfaces; Sand; Shear strain; Shear strength; Shear tests; Soil types; Tensile strength
- Subject Areas: Geotechnology; Highways; I42: Soil Mechanics;
Filing Info
- Accession Number: 01150933
- Record Type: Publication
- Files: TRIS
- Created Date: Feb 19 2010 10:59AM