A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Field Investigation of Geosynthetics Used for Subgrade Stabilization
The use of reinforcement geosynthetics in unsurfaced roads built upon a soft subgrade is known to provide benefit through better distribution of applied loads and increased bearing capacity. The report describes a research project where field test sections were constructed to evaluate the performance of several geosynthetics commonly used for subgrade stabilization. A sandy clay soil was prepared as a weak roadbed material to a CBR strength of approximately 1.8 and a 20 cm thick aggregate layer was compacted over the geosynthetics. Trafficking was provided by a fully-loaded tandem axle dump truck. Longitudinal rut depth, along with discrete measurements of displacement and pore pressure were monitored throughout the trafficking period. Post-trafficking excavations were conducted to evaluate damage to the geosynthetic, base contamination and deformation of the layers. The construction and monitoring techniques employed during the course of this project helped establish a test bed of relatively similar conditions to facilitate more direct comparison of individual test sections to one another. An empirical analysis was used to normalize small differences between the subgrade strength after trafficking and base course thickness between test sections to facilitate a more direct comparison of performance. The results showed that the welded geogrids, woven geogrids and the stronger intergrally-formed geogrid product seemed to provide the best overall performance, while the two geotextile products and the weaker integrally-formed geogrid provided significantly less stabilization benefit based on the normalized rutting performance at 50, 75 and 100 mm of longitudinal rut data, and this performance is likely directly related to the tensile strength of the materials in the cross-machine direction.
Field Investigation of Geosynthetics Used for Subgrade Stabilization
The use of reinforcement geosynthetics in unsurfaced roads built upon a soft subgrade is known to provide benefit through better distribution of applied loads and increased bearing capacity. The report describes a research project where field test sections were constructed to evaluate the performance of several geosynthetics commonly used for subgrade stabilization. A sandy clay soil was prepared as a weak roadbed material to a CBR strength of approximately 1.8 and a 20 cm thick aggregate layer was compacted over the geosynthetics. Trafficking was provided by a fully-loaded tandem axle dump truck. Longitudinal rut depth, along with discrete measurements of displacement and pore pressure were monitored throughout the trafficking period. Post-trafficking excavations were conducted to evaluate damage to the geosynthetic, base contamination and deformation of the layers. The construction and monitoring techniques employed during the course of this project helped establish a test bed of relatively similar conditions to facilitate more direct comparison of individual test sections to one another. An empirical analysis was used to normalize small differences between the subgrade strength after trafficking and base course thickness between test sections to facilitate a more direct comparison of performance. The results showed that the welded geogrids, woven geogrids and the stronger intergrally-formed geogrid product seemed to provide the best overall performance, while the two geotextile products and the weaker integrally-formed geogrid provided significantly less stabilization benefit based on the normalized rutting performance at 50, 75 and 100 mm of longitudinal rut data, and this performance is likely directly related to the tensile strength of the materials in the cross-machine direction.
Field Investigation of Geosynthetics Used for Subgrade Stabilization
E. Cuelho (author) / S. Perkins (author)
2009
143 pages
Report
No indication
English
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