关键词: 胶结矿柱, 嗣后充填, 监测, 采场稳定性

Abstract: In order to improve resource recovery in Xinglong phosphate mine，the two steps of cementing fill of pillar following by waste rocks backfilling at stope room are adopted.To ensure safety of operations，verify the strength of cemented pillar，and to optimize stope structural parameters，the stereo and dynamic stress of cementing pillar and roof overburden is monitored by the combination of micro-seismic monitoring and point monitoring in local.By analyzing the data of stress，strain and displacement in the mining process，the advance distance away from the impact at working face is determined to be 20 m; When mining stope span is about 36 m，the accumulated stress at roof overburden is large，mainly resulting in caving in partial roof.However，stress induced by stope roof movement is much less than the strength of cement concrete pillar，no damage on cementing pillar appeared.The results show that the two-step mining method with subsequent filling and the stope structural parameters can ensure the stability of the stope.The monitoring method can be used to evaluate stope stability timely and accurately，and provide guidance for the safe and efficient mining.

Key words: Cementing pillar, Subsequent filling, Monitor, Stability of stope