关键词:  磷矿, 两层矿回采, 采场稳定性, 数值模拟

Abstract: In order to analyze the stability of the stope in the mining process of a two-layer phosphate mine in Yichang，the upper ore layer Ph2 and the lower ore layer Ph1 are selected as the research objects. According to the strip filling mining method and the room-pillar subsequent waste rock filling mining meth⁃ od，Midas/GTS NX simulation software is used to analyze the displacement changes and stress distribution characteristics of the surrounding rock，pillar and filling body during the mining process of the two-layer ore body. The simulation results show that with the progress of mining，the displacement and stress evolution of the stope are basically the same，and the distribution range and value of the two are gradually increasing. Af⁃ ter the completion of the two-layer mining，the maximum displacement and tensile stress of the stope ap⁃ peared in the roof area，and the values are 2.63 mm and 2.26 MPa，respectively，indicating that the mining caused the roof subsidence. The maximum compressive stress of the stope appears on both sides of the origi⁃ nal ore ( rock ) and around the stope point column，which is 33.56 MPa. When the filling is completed，the maximum compressive stress is reduced to 22.78 MPa，indicating that the filling body has played a very good role in supporting the stope. The analysis shows that the stress of surrounding rock，point pillar and fill⁃ ing body does not reach its failure strength，and no plastic failure occurs，and the whole stope is in a stable state. The research results provide some theoretical and practical guidance for the mining of similar phos⁃ phate mines.

Key words: phosphate mine, two-layer mining, stope stability, numerical simulation