Strain-dependent Fluid Flow Defined Through Rock Mass Classification Schemes |
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| Authors: | J Liu D Elsworth B H Brady H B Muhlhaus |
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| Institution: | (1) CSIRO Exploration and Mining, Nedlands, Australia, AU;(2) Center for Oil and Gas Engineering, The University of Western Australia, Nedlands, Australia, AU;(3) Department of Energy and Geo-Environmental Engineering, The Pennsylvania State University, University Park, PA, U.S.A., US;(4) Faculty of Engineering and Mathematical Science, University of Western Australia, Nedlands, Australia, AU |
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| Abstract: | Summary ?Strain-dependent hydraulic conductivities are uniquely defined by an environmental factor, representing applied normal and
shear strains, combined with intrinsic material parameters representing mass and component deformation moduli, initial conductivities,
and mass structure. The components representing mass moduli and structure are defined in terms of RQD (rock quality designation)
and RMR (rock mass rating) to represent the response of a whole spectrum of rock masses, varying from highly fractured (crushed)
rock to intact rock. These two empirical parameters determine the hydraulic response of a fractured medium to the induced-deformations.
The constitutive relations are verified against available published data and applied to study one-dimensional, strain-dependent
fluid flow. Analytical results indicate that both normal and shear strains exert a significant influence on the processes
of fluid flow and that the magnitude of this influence is regulated by the values of RQD and RMR. |
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