In order to make the use of complex elasto-plastic behavior models more accessible, we attempted to identify the Cam-Clay model in two samples of tropical and lateritic soils (from Senegal/West Africa) from casagrande box shear and oedometric tests. This methodology was used as a substitute for triaxial trials. In this article, we first verify the test results by the finite element method with the Optum software. We use a simulation of the tests with the modified Cam Clay model as the behavior model. Then, we simulate the oedometric test on tropical soils with the Castem software and also use the modified Cam Clay model. These calculations make it possible to write the criterion of plasticity of the material starting from the expression of the surface of load while passing by the calculation of the volumetric and deviatoric stresses.
References
[1]
Roscoe, K.H., Schofield, A.N. and Wroth, C.P. (1958) On the Yielding of Soils. Géotechnique, 8, 22-53. http://doi.org/10.1680/geot.1958.8.1.22
[2]
Schofield, A. and Wroth, P. (1968) Critical State Soil Mechanics. Lecturers in Engineering at Cambridge University. http://www.civ.eng.cam.ac.uk/geotech_new/publications/schofield8wroth81968.pdf
[3]
Tavenas, F. and Leroueil, S. (1977) Effects of Stresses and Time on Yield of Clay. Proceedings 9th Int. Conf. on Soil Mech. and Found. Eng., Tokyo, Vol. 1, 319-326.
[4]
Ndiaye, C. and Berthaud, Y. (2018) Identification of a Cam Clay Model through Shear-Box and Oedometer Tests. Application to Lateritical Soils from Senegal (West Africa). Geomaterials, 8, 1-13. https://doi.org/10.4236/gm.2018.81001
[5]
Fall, M. (1993) Identification and Mechanical Characterization of Lateritic Gravels from Senegal: Application to the Road Domain. Doctoral Thesis of the I.N.P.L (National Polytechnical Institut of Lorraine/France) in Civil Engineering, 240 p.
[6]
Fall, M., Tisot, J.P. and Cisse, I.K. (1995) Mechanical Behavior at the Casagrande Shear Apparatus of Three Lateritic Gravels from Western Senegal. Bulletin of the International Association of Engineering Geology, 52, 59-73. https://doi.org/10.1007/BF02602682
[7]
OptumG2 Materials Manual (2016).
[8]
Castem. http://www-cast3m.cea.fr
[9]
El Dine, B.S. (2007) Study of the Mechanical Behavior of Coarse Matrix Soils. Planète et Univers [physics]. Ecole-des-Ponts ParisTech, French.
[10]
Thi, D.V. (2017) Numerical and Analytical Modeling of Drying Cracking in Clay Soils. Civil Engineering. Paris-Est University, French.
[11]
Berthaud, Y., De Buhan, P. and Schmitt, N. (2013) Aide-mémoire de mécanique des sols-Dunod Ed. 2e édition, Dunod Ed./L’Usine Nouvelle, collection Aide-mémoire de l’ingénieur, 320 p.
[12]
Ndiaye, C., Fall, M., Ndiaye, M., Sangare, D. and Tall, A. (2014) A Review and Update of Analytical and Numerical Solutions of the Terzaghi One-Dimensional Consolidation Equation. Open Journal of Civil Engineering, 4, 274 284. https://doi.org/10.4236/ojce.2014.43023
[13]
Ndiaye, C. (2018) Application of the Concepts of Limit State and Critical State to Tropical Soils. Doctoral Thesis of the University of Thiès/Senegal in Geotechnics, 177 p.
