Field Evaluation of GEOSYNTHETICALLY STABILIZED PAVEMENTS

摘要

Nine instrumented flexible pavement test sections were constructed in a rural secondary road in southwest Virginia. This 15-m-long test sections were built to examine the effects of geogrid and geotextile stabilization. Three were non-stabilized. The test section base course thicknesses range from 10 cm to 20 cm and the hot-mix asphalt (HMA) thickness averaged 8.9 cm. Geosynthetic stabilization was placed on top of the subgrade. An extensive instrumentation infrastructure was constructed to locate all instrumentation, cabling, and data acquisition facilities underground. The pavement test sections were heavily instrumented with two types of pressure cells, soil and HMA strain gages, thermocouples, and soil moisture cells. In addition, foil strain gages were installed directly on the geogrid and geotextiles. The data acquisition was triggered by traffic passing over piezoelectric sensors and operates remotely. The corresponding data is transferred via modem to Virginia Tech for processing. A truck was used (at different loads, tire pressures, and speeds) to calibrate the in-situ instruments Periodic rut depth and falling weight deflectometer (FWD) measurements were taken.