Abstract: A patent device , which is combined with the MTS815.02 Rock Mechanics Test System, is used to measure the seepage properties of non-Darcy flow in broken sandstone; and the permeability and the non-Darcy flow β-factor are obtained by steady-state seepage method. The relations between both the permeability and the non-Darcy flow β-factor and porous ratio are obtained through linear regressions. It is held that the seepage properties are mainly decided by the porous ratio; and the porous ratio is concerned with not only the current stress, but mainly also the history of loading. The test results show that the seepage flow of water in broken sandstone does not obey the Darcy’s law any longer, but obey the Forchheimer’s formula; and the characteristic of non-Darcy flow is more remarkable when the rock is under less porous ratio. Both the permeability and the non-Darcy flow β-factor can be fit by power functions of porous ratio.

Key words: broken sandstone, seepage properties, porous ratio, Forchheimer’s formula, non-Darcy flow β-factor