Abstract: Rock mass exists often with a combined fractured-vuggy-porous void in nature. This work focused primarily on the seepage behaviour of a combined fractured-vuggy-porous geological media. On the basis of brief analysis for the Darcy’s law applied to the porous media, the Poiseuille’s law suitable for the fracture flow and the Darcy-Weibach theory used in the pipe flow, this paper derived the equivalent seepage coefficient KE which could describe the seepage nature of different combinations of fractured-vuggy-porous voids in geological medium and analyze the main factors for different combinations. In addition, laboratory seepage tests were used for two combinations to validate the theoretical equations derived, and available porous brick was chosen to simulate the rock matrix during testing. Comparison of the values of KE obtained from testing and computing respectively shows that KE is in the same order of magnitude and the error is very small as well.

Key words: fractured-vuggy-porous media, Darcy flow, fracture flow, pipe flow, equivalent seepage coefficient