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The pull-out resistance of geogrids is investigated by performing pull-out tests for three geogrids embeded in sands and gravelly sands. It is found that the contribution from the friction between soil and geogrid is more important than the passive resistance of soil. The ultimate pull-out resistance is higher for rigid geogrid than soft geogrid. Besides, the theoretical bearing stress ratio Fq is not suitable for soft geogrids for predicting the passive resistance.