Mud Shrinkage and Cracking Phenomenon Experimental Identification Using Digital Image Correlation
The main goal of this research was to try, experimentally, to identify the cause of initiation and propagation of cracks network related to desiccation. The work may provide a better understanding of the drying behavior in clayey soils. Kaolin, which is a
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Mud Shrinkage and Cracking Phenomenon Experimental Identification Using Digital Image Correlation Mahdia Hattab, Said Taibi, and Jean-Marie Fleureau
Abstract The main goal of this research was to try, experimentally, to identify the cause of initiation and propagation of cracks network related to desiccation. The work may provide a better understanding of the drying behavior in clayey soils. Kaolin, which is a little swelling “nearly pure” kaolinite, was studied in this context. The experimental method is based on the determination of the local two-dimensional strains and displacements fields using the softwares Vic-2D and Vic-3D on thin layers of the initially saturated clay. Using digital image correlation technique at the macroscopic level, the analyses of strain fields during drying allow to clearly identify and characterize different phenomena such as: shrinkage, stress concentration, initiation, and propagation of cracks.
19.1 Introduction Soils cracking phenomenon due to desiccation is among the more complex issues that arise in the geotechnical engineering field. The phenomenon, related to the clayey soil behavior, can have a severe impact on the bulk properties of soils, reducing strength, affecting compression ability, increasing permeability, etc. Consequently, the mechanical performances, as well as the hydric properties of the material, weaken, causing in many circumstances, sometime dramatically, damages in geotechnical structures, earthen structures, and soil-supported structures. One can M. Hattab (B) Laboratoire d’Etude des Microstructures et de Mécanique des Matériaux, Université de Lorraine, CNRS UMR 7239, Arts et Métiers ParisTech, 57000 Metz, France e-mail: [email protected] S. Taibi Laboratoire Ondes et Milieux Complexes, CNRS UMR 6294, Université Le Havre Normandie, 53 Rue de Prony, BP540, 76058 Le Havre CEDEX, France J.-M. Fleureau Laboratoire de Mécanique des Sols, Structures et Matériaux, CNRS UMR 8579, Université Paris-Saclay, CentraleSupélec, 3 Rue Joliot Curie, 91190 Gif-sur-Yvette, France © Springer Nature Switzerland AG 2021 F. dell’Isola and L. Igumnov (eds.), Dynamics, Strength of Materials and Durability in Multiscale Mechanics, Advanced Structured Materials 137, https://doi.org/10.1007/978-3-030-53755-5_19
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quote for instance structures such as engineering barriers, consisting of clayey barrier system that seals wastes; the latter might be with different dangerousness level. The barrier is used to ensure the isolation and the confinement of wastes (Albrecht and Benson 2001). It thus appears obvious that any variation in the initial expected performances of this kind of structure, especially of the compressibility and of the permeability, risks a loss of sealing and leaks of dangerous substances into the environment. Hence, the clayey barriers behavior has to be precisely followed and mastered. In common geotechnical engineering practice, desiccation cracks are widely reported in clayey soils, see for instance Longwell (1928), Willden and
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