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Full-scale field tests on geosynthetic reinforced unpaved roads on soft subgrade
Geosynthetics used to reinforce unpaved roads on soft subgrade facilitate compaction, improve the bearing capacity, extend the service life, reduce the necessary fill thickness, diminish deformations, and delay rut formation. The combination of geosynthetic reinforcement and fill help to spread the concentrated vertical loads and to inhibit large deformations and local failures. Two modes of action can be distinguished: (i) Confinement improves the load distribution on the subgrade and reduces the necessary fill thickness. (ii) Membrane effect: A geosynthetic reinforcement at the fill-subgrade interface is tensioned and exerts an upward force thus improving the bearing capacity. A full-scale field test on a geosynthetic reinforced unpaved road was carried out to investigate the bearing capacity and its performance on a soft subgrade. The test track was built with three layers of crushed, recycled fill material. The geogrids were instrumented with strain gauges to measure the short- and long-term deformations and the ongoing formation of ruts was assessed from profile measurements. The various geosynthetics used for this reinforced unpaved road were found to have a relevant reinforcing effect only when used under a thin aggregate layer on a soft subgrade. Under such conditions, ruts can form in the subgrade, mobilizing strains and thus tensile forces in the geosynthetic. The achievable degree of reinforcement depends on the stiffness of the geosynthetic and is limited by finite lateral anchoring forces.
Full-scale field tests on geosynthetic reinforced unpaved roads on soft subgrade
Geosynthetics used to reinforce unpaved roads on soft subgrade facilitate compaction, improve the bearing capacity, extend the service life, reduce the necessary fill thickness, diminish deformations, and delay rut formation. The combination of geosynthetic reinforcement and fill help to spread the concentrated vertical loads and to inhibit large deformations and local failures. Two modes of action can be distinguished: (i) Confinement improves the load distribution on the subgrade and reduces the necessary fill thickness. (ii) Membrane effect: A geosynthetic reinforcement at the fill-subgrade interface is tensioned and exerts an upward force thus improving the bearing capacity. A full-scale field test on a geosynthetic reinforced unpaved road was carried out to investigate the bearing capacity and its performance on a soft subgrade. The test track was built with three layers of crushed, recycled fill material. The geogrids were instrumented with strain gauges to measure the short- and long-term deformations and the ongoing formation of ruts was assessed from profile measurements. The various geosynthetics used for this reinforced unpaved road were found to have a relevant reinforcing effect only when used under a thin aggregate layer on a soft subgrade. Under such conditions, ruts can form in the subgrade, mobilizing strains and thus tensile forces in the geosynthetic. The achievable degree of reinforcement depends on the stiffness of the geosynthetic and is limited by finite lateral anchoring forces.
Full-scale field tests on geosynthetic reinforced unpaved roads on soft subgrade
Feld-Großversuche zur Verstärkung von ungepflasterten Straßen über weichem Untergrund mit Hilfe von Geokunststoffen
Hufenus, Rudolf (author) / Rueegger, Rudolf (author) / Banjac, Robert (author) / Mayor, Pierre (author) / Springman, Sarah M. (author) / Brönnimann, Rolf (author)
Geotextiles and Geomembranes ; 24 ; 21-37
2005
17 Seiten, 21 Bilder, 3 Tabellen, 60 Quellen
Article (Journal)
English
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