CARTOGRAPHY OF GRANULAR SOILS USED IN ROAD PAVEMENT LAYERS IN BENIN

Civil engineering works require the selection of granular materials and the assessment of their geomechanical characteristics. The lack of relevant geotechnical mapping to facilitate these operations leads to costly and sometimes inconclusive prospecting for each project. The aim of this study was to contribute to the availability of geotechnical mapping in Benin. To this end, and in order to capitalize on the data, the proposed methodological approach is based on the systematic and controlled recording of data produced by laboratories during geotechnical surveys for road construction projects. A web platform called Road Mat was designed to collect the data. It is intended to be constantly evolving in order to improve our knowledge of tropical soils, which are essentially made up of laterites, widely developed residual formations with particularly complex development processes and which are dependent on bedrocks, with a view to better controlling the availability of granular materials. The mapping was carried out by exporting the data to Arcgis 10.8. The geotechnical parameters and data were taken from road surveys covering a total of 3118 km.