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Abstract Combining with the backfilling(RSA) engineering in stope III of Sijiaying open-pit to underground iron mining of Hebei Iron and Steel Group Mining Co.，Ltd.，the permeability of rock and soil aggregate(RSA) is studied systematically by laboratory test，in-situ experiment and numerical simulation. The results show that there is an approximation linear relationship between the permeability coefficient of RSA and its non-uniform degree，and the permeability coefficient of RSA is directly proportional to the void ratio. The permeability of RSA can be reduced effectively by controlling the gradation of particle size of waste rock backfilled and reducing the average particle size and non-uniformity reasonably. The influence order to the seepage discharge of RSA is determined by particle element numerical orthogonal tests. The relationship formulas of the effects of four factors(thickness of back-packing，head pressure，porosity，particle diameter) on the seepage are obtained by quadratic stepwise regression analysis，and it can provide a calculation tool for impermeability of RSA.
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Received: 04 March 2009
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