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Numerical modelling of coupled flow and deformation in fractured rock specimens. (English) Zbl 0933.74062

Summary: A dual-porosity poroelastic model is extended to represent in cylindrical coordinates the flow-deformation effects observed in cylindrical laboratory samples with a central wellbore or with non-repeating axisymmetric injection on the periphery. Nine-node quadratic elements are used to represent mechanical deformation, while eight-node linear elements are used to interpolate the pressure fields. The model presented is validated against simplified analytical results, and is then extended to describe the behaviour of homogeneous and heterogeneous laboratory specimens subjected to controlled triaxial stresses and injections. The results show significant influence of stress-deformation effects on the system behaviour.

MSC:

74S05 Finite element methods applied to problems in solid mechanics
74L10 Soil and rock mechanics
76S05 Flows in porous media; filtration; seepage
86A05 Hydrology, hydrography, oceanography
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