Great many results about the creep properties of rock have been achieved

while few reports on the cemented backfill’ s creep characters were obtained. In this paper

creep property of cemented backfill is characterized by Hoek-Kelvin model. Cemented backfill creep experiments are firstly conducted in the laboratory

then the parameters of Hoek-Kelvin creep model are identified using particle swarm optimization algorithm. Meanwhile

the sensitivity of creep parameters to the stress level is studied. Results show that the numerical value of EH and η vary little at different loading stress levels

and EK is very sensitive to the change of loading stress level. The proposed creep model for backfill is developed with the software FLAC3D; and it has been used to numerically simulate multi-stage loading on cemented backfill. The numerical results agree well with the experimental ones.