Geogrids have been successfully used to improve soft subgrade and reinforceweak base course by providing lateral confinement. However, uniaxial and biaxialgeogrids cannot provide uniform resistance in all directions. A new product termed“Triaxial geogrid” was developed to overcome this limitation. The triaxial geogrid isexpected to have a more stable grid structure to provide uniform resistance in alldirections as compared with uniaxial and biaxial geogrids. However, the effects of thetriaxial geogrids on the performance of reinforced bases have not been well evaluated.In this study, unreinforced and triaxial geogrid-reinforced bases over a weak subgradewere constructed in a large geotechnical testing box (2m×2.2m×2m high) at theUniversity of Kansas and tested under cyclic loading. During the tests, the surfacedeformations and the vertical stresses at the interface between the base and thesubgrade were monitored. The test results showed that triaxial geogrids increasedpercentage of resilient displacement and reduced permanent displacement and verticalstresses at the interface as compared with the unreinforced base.
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