چكيده به لاتين
Abstract:
Nowadays soil reinforcement by geosynthetics is a common practice. Different investigations on carbonate soils have pointed out that shearing behavior and engineering properties of these soils is different from silicate sand and depends on the origin of the soil.
In this study, the large scale direct shear apparatus of dimensions 30×30, a property of the Saruj Azma geotechnics lab, was employed in order to investigate the shearing behavior of the geosynthetic reinforced carbonate sand. The tests were conducted on Hormoz carbonate sand with 2 different gradings and two different densities, 35% and 70%. To reinforce the specimen soils, two types of geogrids with different aperture and one type geotextile were used. The results demonstrate that as the soil density increases, the shearing resistance of the contact surface increases. It was also observed that geosynthetics' resistance mobilisation was dependent on the soil gradation, i.e, the specimen type B with finer grading and higher coefficient of unity (Cu) had a better interaction with the geogrids compared to specimen type A. In sand- geotextile specimens, specimen A had better interaction with the geotextile compared to B, owing to the fact that A had coarser grains with pointed edges, while B had finer gardes.
Keywords: Gradation, Relative Density, Geogrid, Geotextile, Carbonate Sand, Direct Shear
