| A research program was established in 1986 on the use of geogrids in a fine-grained cohesive soil to reinforce the steep slopes of a test embankment. The test fill is 12 m high with 1:1 side slopes and has four sections: three are reinforced with different geogrids and the fourth is unreinforced for comparison purposes.; Instrumentation was installed to measure the performance of the soil and geogrid layers. The instrumentation applied to the geogrid layers includes electrical wire resistance and inductance coil strain gauges and thermocouples. Horizontal and vertical extensometers, horizontal and vertical inclinometers and pneumatic piezometers were installed in the embankment and foundation soil to monitor its behavior.; Measurements of the instruments were taken in 2003, fifteen years after the completion of the embankment and they were compared to the last set of measurements taken in 1990. The long term performance of the embankment and instrumentation was investigated. |
