Strain-dependent fluid flow defined through rock mass classification schemes

Liu, J Elsworth, D Brady, BH Muhlhaus, HB

J. Liu et al., Strain-dependent fluid flow defined through rock mass classification schemes, ROCK MECH R, 33(2), 2000, pp. 75-92

45

INGLESE

Article

Geological Petroleum & Minig Engineering

ROCK MECHANICS AND ROCK ENGINEERING

0723-2632 → ACNP

33

2

2000

75 - 92

ISI

0723-2632(200004/06)33:2<75:SFFDTR>2.0.ZU;2-4

Strain-dependent hydraulic conductivities are uniquely defined by an enviro nmental factor, representing applied normal and shear strains, combined wit h intrinsic material parameters representing mass and component deformation moduli, initial conductivities, and mass structure. The components represe nting mass moduli and structure are defined in terms of RQD (rock quality d esignation) and RMR (rock mass rating) to represent the response of a whole spectrum of rock masses, varying from highly fractured (crushed) rock to i ntact rock. These two empirical parameters determine the hydraulic response of a fractured medium to the induced-deformations The constitutive relatio ns are verified against available published data and applied to study one-d imensional, strain-dependent fluid flow. Analytical results indicate that b oth 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.