A Numerical study of compacted clay tensile strength by discrete element modelling: A bending test application
Résumé
The study of the clay tensile behaviour is one of the topics which requires a specific lighting especially when we give a closely attention to the pathology of the constructions built with or on the clays submitted to significant tensilestrenght. Therefore, failure or damage of clay can be related especially to tensile limit and not to shear limit overtaking. It is the case of compacted clay liners in wastes landfill cover or for embankments built on high compressible soils. In order to study the tensile compacted clay behaviour, a series of laboratory bending tests were carried out. On the basis of the test results, different numerical simulations using Discrete Element Method were engaged. Two numerical bending tests were carried out: a three points bending and a four points bending. A comparison between the two numerical protocols is given. Four analytical models (classical elasticity, bimodular elasticity, differential model and struts-tie method) are used in order to interpret bending tests results and are compared with the numerical simulations. At the same time, the validity of the assumptions relative to the four models was discussed. To outcome to these results, a study and an adjustment of numerical and micromechanical parameters were carried out. It was demonstrated that the Discrete Element Method has a strong correlation with laboratory tests and can contribute somewhat to the understanding and discussion on the validity degree of the kind of indirect tests and of their interpretation.
Domaines
Génie civilOrigine | Fichiers produits par l'(les) auteur(s) |
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