Reinforcement of Subgrade Soils with the Use of Geogrids

Abstract

This Reinforcement of Subgrade Soils with the Use of Geogrids paper examined the basic engineering and geotechnical properties of poor subgrade soils using geosynthetics like geo-grids to improve its strength. This is considered to be of great importance in civil engineering works.

Subgrade soils, its properties like permeability and strength are essential to the design of pavement structures. Experiments were carried out to investigate the application of geo-grids on subgrade soils under unsoaked conditions. Geotechnical test were carried out to determine Grain size analysis, atterberg, compaction and California bearing ratio test. CBR test were carried out by placing the geo-grids at varying depths and in single layer under unsoaked conditions to determine the strength of the soil.

Conclusion

The study investigated the application of geogrids to subgrade material as a form of reinforcement to road construction. Theinclusion of the geo-grid considerably increases the strength of poor soils, which is reflected in the higher CBR values. The study shows that the strength of the subgrade is significantly altered positively by the positioning of the geo-grid at varying depth.On reinforcing the soil, there is considerable increase in performance of the subgrade in the unsoaked condition. The use of geogrids as reinforcement to poor soils improves its strength.