1997 Volume 12 Pages 25-34
Large-scale model tests are conducted on geogrid-reinforced soil prepared with dense and loose Toyoura sand. The earth pressures and strains induced along the geogrids are measured during surcharge application and movement of the model retaining wall. One test series are conducted with three geogrid sheets placed horizontally in the model. The other test series are conducted without geogrid reinforcement. The earth pressures are found to become smaller as the model wall moves away from the soil Especially, the earth pressures of the reinforced soil become smaller, compared with those of the non-reinforced soil. The strans along the geogrids also develop as the model wall moves away, and have peaks at the positions within 50cm from the retaining wall.
By comparing the earth pressure changes and the geogrid strains, the discussions are made with respect to the difference in the reinforcement mechanism associated with dense and loose soils.