Behavior in mixed-mode of desiccation cracks on a clayey rock front gallery. (June 2022)

• Record Type: Journal Article
• Authors: Hedan, Stephen; Valle, Valéry; Giot, Richard; Cosenza, Philippe
• Is Part Of: International journal of rock mechanics and mining sciences. Volume 154(2022)
• Publication Date: 2022-06
• Subjects: Argillaceous rock -- Digital image correlation -- Mixed-mode fracture -- Crack porosity -- Cracked area; Rock mechanics -- Periodicals; Soil mechanics -- Periodicals; Mining engineering -- Periodicals; Roches, Mécanique des -- Périodiques; Sols, Mécanique des -- Périodiques; Technique minière -- Périodiques; 624.151305
• DOI: 10.1016/j.ijrmms.2022.105104
• Languages: English
• ISSNs: 1365-1609

Abstract

Abstract: This study reports on the mixed-mode behavior of desiccation cracks in a clayey rock front gallery. As most digital image correlation (DIC) algorithms have access to the full-field measurements of the displacements and strains, the improvements in DIC now allow the automatic detection of the jumps in the displacements induced by the opening and sliding of desiccation cracks without imposed initial conditions. This new local data allows us to specifically study the kinematics of the crack lips at each deformed state. These results allow us to quantify the opening and sliding of cracks and the cracked area during the desaturation and saturation paths of the rock mass. Amongst other results, a linear trend between the deformation of the solid phase and the crack porosity is observed. The results also demonstrate that most desiccation cracks evolve in a mixed-mode, the values of the shear component are of the same order of magnitude as the opening values. Highlights: In-plane displacement, opening, sliding and orientation of desiccation crack fields were determined by H-DIC. Application to a real case of a gallery front of a clay rock mass. Mixed-mode behavior of the desiccation cracks of a gallery front. Measurement of the cracked area, crack surface porosity and range of the crack surface porosity. Linear relationship between the crack surface porosity and shrinkage of the solid phase.