This study was performed to investigate the effects of the relative density on the geosynthetics reinforced sandy ground with horizontally one-layer reinforcement. A series of plane strain model tests on the sandy ground were performed with three different relative densities (Dr=49%, 68% and 86%). Values of 0.7B and 4B as the depth and length of one-layer reinforcement were used, where B is the loading plate width. Geosynthetics such as geonet, tensar grid and fortrac grid were used as reinforcing materials, and the standard sand of Korea, which is called ‘Jumunjin sand’, was used as a soil of model ground. From the test results it was shown that the effect of relative density was very great on the increase of the ultimate bearing capacity. However, BCR, which is the ratio of the unreinforced ground to the peak bearing capacity of reinforced one, was inclined to be almost constant in spite of the difference of relative density. And BCR. which is defined as the bearing capcity ratio of the unreinforced ground to the reinforced one, at the same settlement, was smallest at Dr-68% among them.
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