The Impact of Size-Dependent and Stress-Dependent Fracture Properties on the Biot and Skempton Coefficients of Fractured Rocks - INSU - Institut national des sciences de l'Univers Accéder directement au contenu
Article Dans Une Revue (Article De Synthèse) Rock Mechanics and Rock Engineering Année : 2024

The Impact of Size-Dependent and Stress-Dependent Fracture Properties on the Biot and Skempton Coefficients of Fractured Rocks

Résumé

The impact of fractures on the hydro-mechanical behavior of fractured rock masses is analyzed by means of equivalent Biot and Skempton coefficients. We assume the derivation proposed by De Simone et al. (Rock Mech Rock Eng 56:8907–8925, 2023), in which the equivalent coefficients depend on the combination of fracture size, orientation and mechanical properties, with the mechanical properties of the intact rock. We extend this theory to incorporate more complex and realistic assumptions on fractures, such as the dependence of aperture and normal stiffness on size and confining stress. Under this setting, we explore the range of variability of the two equivalent coefficients with respect to the stochastic distribution of fracture size and orientation in the rock mass, as well as to depth and stress faulting regime. We find that, although and increase with fracture density, they are larger if the network is populated by a few large fractures than if populated by many small fractures because large fracture are more compliant. Orientation and depth also greatly impact the coefficients. Fractures oriented such that the applied normal stress is maximized, lead to larger equivalent Skempton coefficients and smaller equivalent Biot coefficient. However, the initial confining stress maximizes both coefficients when fractures are shallow and parallel to the maximum principal stress. Therefore, fracture orientation may differently impact the equivalent coefficients depending on the initial and applied stress tensors. Overall, fracture contribution is larger in shallow rocks containing large fractures that are oriented parallel to the largest principal initial stress and normal to the applied stress.
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Dates et versions

insu-04638151 , version 1 (08-07-2024)

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Silvia de Simone, Caroline Darcel, Hossein Kasani, Diego Mas Ivars, Philippe Davy. The Impact of Size-Dependent and Stress-Dependent Fracture Properties on the Biot and Skempton Coefficients of Fractured Rocks. Rock Mechanics and Rock Engineering, inPress, ⟨10.1007/s00603-024-04038-7⟩. ⟨insu-04638151⟩
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