![]() The second device allows for the measurement of the evolution of the morphology and of the void map of the rock joints during their mechanical loading (compression or shearing). The output flow is measured in real time using a sectorized peripheral membrane for acquisition of data about the directionality or anisotropy of the flow. ![]() The first device controls the injection of a fluid, regulated in pressure or discharge near the centre of the sample of rock joint, which produces a quasi-radial flow within the joint. This system allows for investigations on the anisotropy of the hydraulic conductivity, as well as for its heterogeneity. Both models are semi-incremental, readily implemented in a numerical code, and adaptable to existing elastoplastic joint behavior models.Ī new experimental system composed of two devices is presented for studying the hydraulic conductivity of rock joints and other interfaces in relation with their mechanical loading. The models also allow prediction of surface degradation in large-scale shear fractures. Good agreement between experimental and predicted degradation was observed. The first model was developed based on the evolution of secondary roughness (an extension of an existing model) and the second was developed based on the concept of “average asperity probable contact angle.” Model variables can be initial normal stress (σn0 k n ≥ 0), normal stiffness (k n σn0 ≥ 0), accumulated shear displacement u s-tot (monotonic or cyclic shearing), and surface roughness amplitude a 0. Based on previously proposed surface roughness description parameters (k a, θs, SRs, DRr, a 0), two generalized rock joint surface roughness degradation models were proposed to predict the variation of joint surface degradation during shearing under both constant normal stress (CNS) and constant normal stiffness (CNK) loading conditions. ![]()
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