In this paper, indoor creep test under unconfined conditions was conducted for two typical types of high-strength geogrid, one of which was applied to practical roadbed engineering, where creep observation is taken for a continuous year. Test result shows that creep rate under unconfined conditions is almost 2 times of that under confined conditions if the high-strength geogrid are approximately under load level. At last, the paper proposed some suggestions on value taking range of creep strength reduction factor for high-strength geogrid.
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