The mixed flow of gas and liquid through discontinuous geological media is a complex phenomenon. This behaviour is particularly important in understanding the engineering performance of the rock mass in the vicinity of underground coal mines, such as those in the local Southern Coalfield of New South Wales (Australia). The use of Relative Permeability (K_r) allows the change in hydraulic properties to be analysed in terms of accepted engineering mechanics. In this paper, the results from the testing of fractured sandstone specimens in the Two-phase High Pressure Triaxial Apparatus (TPHPTA) are used to illustrate two-phase flow characteristics of discontinuous geological media. The test results are analysed using an extension to a simplified stratified flow model.
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