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Numerical modelling of coupled flow and deformation in fractured rock specimens

✍ Scribed by Bai, M.; Meng, F.; Elsworth, D.; Abousleiman, Y.; Roegiers, J.-C.

Publisher: John Wiley and Sons
Year: 1999
Tongue: English
Weight: 268 KB
Volume: 23
Category: Article
ISSN: 0363-9061
DOI: 10.1002/(sici)1096-9853(199902)23:2<141::aid-nag962>3.0.co;2-g

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✦ Synopsis

A dual-porosity poroelastic model is extended to represent behaviour in cylindrical co-ordinates for the evaluation of flow-deformation effects in cylindrical laboratory samples incorporating a central wellbore or 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, which offers significant advantages over the behaviour of other non-conforming elements. The model presented is validated against simplified analytical results, and extended to describe the behaviour of homogeneous and heterogeneous laboratory specimens subjected to controlled triaxial state of stress and injection tests. Apparent from the results is the significant influence of stress-deformation effects over system behaviour.

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