Abstract: In view of the stability of the interval pillar recovery under the complex filling body， and with the mining of -370 m middle section of the Sanxin Gold and Copper Mine in Hubei as background， an optimization scheme was put forward: the ore room with interval pillar is divided into three layers and then explored from bottom upwards， and the size of each layer is 12 m × 10 m with the retaining wall of 1m. The stability of the stoping process was studied by the similar simulation test， and the displacement and stress variation of the two sides and the roof of the mining room were revealed. Then， the results of the similar simulation tests were compared and analyzed with help of the finite difference software FLAC3D. The results showed that the similarity test results were in good agreement with the numerical simulation results. In the process of pillar recovery， the displacement of both sides and roof of the room is less， and the strain values tend to be stable， which indicates that the stability of the stoping process based on this scheme is well， and the safe and efficient recovery of the pillar can be realized.

Key words: Complex filling body, Interval pillar recovery, Simulation test, Numerical calculation, Stability study