Abstract
This research deals with the characterization of 2-phase flow in a fractured rock mass. A comprehensive mathematical model with which to predict the quantity of each flow component in a single joint is developed. A joint with 2 parallel walls filled with layers of water and air (stratified) is analyzed. The effects of mechanical deformation of the joint, compressibility of fluids, the solubility of air in water, and phase change between fluids have been taken into account to develop analytical expressions that describe the behavior at the airwater interface. The model was calibrated using a newly designed 2-phase triaxial cell. Tests were conducted on fractured hard rock samples for different confining pressures with inlet water and inlet air pressures. As in single-phase flow, it was found both experimentally and theoretically, that the flow quantities of each phase decreases considerably with an increase in confining stress. Results also confirm that the effect of joint deformation and compressibility of fluids governs the flow volume of 2-phase flow. Good agreement was obtained between experimental data and numerical predictions.
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