%0 Journal Article %T Effect of Water Content and Grains Size Distribution on the Characteristic Resilient Young¡¯s Modulus (<i>E<sub>c</sub></i>) Obtained Using Anisotropic Boyce Model on Gravelly Lateritic Soils from Tropical Africa (Burkina Faso and Senegal) %A Bibalo Ida Josiane Ki %A Makhaly Ba %A Rokhaya Gueye %A Pierre Hornych %A Ali Sana %J Open Journal of Civil Engineering %P 134-152 %@ 2164-3172 %D 2021 %I Scientific Research Publishing %R 10.4236/ojce.2021.111009 %X This research was carried out to determine the rheological parameters of lateritic soils in order to contribute to the improvement of the technical documents used for pavement design in tropical Africa. The study is based on the loading repeated of cyclic triaxial tests (LRT) performed at University Gustave Eiffel (formerly Institut Fran&#231;ais des Sciences et Technologies des Transports de l¡¯Am¨¦nagement et des R¨¦seaux (IFSTTAR)) in Nantes with the application of the European standard EN 13286-7: 2004 [1]. The tests were performed at constant confinement stress and using the stepwise method to determine the resilient axial (\"\") and radial (\"\") deformation as a function of the axial and radial stresses. Four gravel lateritic soils from different sites selected in Burkina Faso and Senegal were the subject of this research for the triaxial tests. These materials have a maximum diameter of 20 mm and a percentage of fines less than 20%. The LRT tests were carried out on samples compacted at three moisture contents (wopm - 2%,