The purpose of the present study is to develop a method for simultaneous solution of stress and flow in a deformable fractured isotropic porous medium saturated with a single phase slightly compressible fluid. The system defined as such can be under the effect of body forces, boundary loads, initial stress, and influenced by some fluid pressure disturbance. The method involves application of the theory 3Ä elasticity Äor plane strain systems, Darcy's law for porous medium, and Biot's constitutive equations for the mixture of fluid and solid skeleton. The resulting initial boundary value problem is then numerically formulated into finite element equations useing the calculus of variations.

A'computer program has been developed by modifying existing programs to consider interactions between fracture and porous medium when both flow and stress fields are coupled. problems in rock masses where fractures extend from one boundary to another, intersect each other, or arc isolated in the porous medium. The fractures may have random orientations and the rock matrix can be permeable or impermeable. or axially symmetric. state flow field under Ststic equilibrium or a non-steady flow field in The program is capable of handling The reqioii under investigation may be two dimensional Solutions can be obtained for either a steady, conjunction with quasi- static equilibrium conditions. Results obtained for certain typical examples are generally in close agreement with analytical solutions available for rig28 systems. addition, some new features on the response of deformable rock masses under the influence of a flow field have been studied. development can be extended to handle coupled stress and heat flow problems in rock masses. Such modification requires new sets of constitutive equations and the application of realistic thermomechanical material properties.

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