GEOTECHNICAL STUDY AND PHYSICO-CHEMICAL CHARACTERIZATION OF SOILS OF THREE QUARRIES IN THE CITY OF ABECHE IN CHAD

This article focus on the geotechnical and physicochemical studies of soils from three sites in the city of Abéché. The article presents the locations of the sampling sites, experimental devices, and some physical parameters. Prior to the geotechnical study, a physicochemical characterization of soil from different quarries was conducted, including wetting-drying tests, capillary water absorption tests, and desorption isotherms of bricks. Finally, geotechnical characterizations of three soils were performed, including analyses of grain size by sieving and sedimentometry, Atterberg limits, methylene blue tests, and the bulk density of solid particles. The results showed that the different soils were very similar, being of a low-plasticity loam and clay type. The results also showed that the organic matter content in the different soils was very low and that the average pH value of the three sites was around 7.1, which is neutral with a slightly basic tendency.