Analysis of soil-geogrid interaction and alternative soil layer approach for improved road embankment stability

Abstract

Road embankments are critical elements of modern transportation infrastructure that provide support and stability to the roadway. However, embankments can be vulnerable to slope instability due to factors such as poor soil quality, excessive loads, frost, and steep slopes. To address these challenges, engineers have developed various methods to reinforce embankments, including the use of geogrids. In this study examined mechanical properties of soil-geogrid interaction using laboratory testing method such as triaxial compression. Also, geotechnical software, such as GEO5, to assess the stability and safety of the structures was used. Analysis revealed that the required thickness of an additional soil layer to achieve the same slope stability as that with geogrid reinforcement depends on the soil type and slope steepness. Specifically, the higher the apparent cohesion of the soil, the smaller the thickness of the additional layer, while steeper slopes require greater thickness of the additional layer of soil. We also found that an alternative soil layer with apparent cohesion as a composite material has potential in slope stability calculations, but requires further analysis.