INTERFACE PROPERTIES OF A NEW TYPE REINFORCED SOIL WITH DIFFERENT GEOSYNTHETIC MATERIALS

The influence of the geosynthetic materials on the reinforced soil interface properties is important． A series of large direct shear tests with different geosynthetic materials under different normal stress were done for this new reinforced soil． Test results indicate that the shear strength of the interface with geogrids was significantly higher than that of the interface with geotextiles，the interface shear strength was developed with the increase of the vertical stress． Combined with theory analysis，the direct shear test of different geogrids showed that horizontal and longitudinal ribs of the geogrids made the interface shear strength be increased by about 15. 3% and 4. 1% respectively．