| In this paper, engineering geology, hydrogeology, and production situation of the iron mine were analyzed in detail and got the basic situation of quarry operation and distribution of residual ore; Selecting rock samples in the depth -195m and -177m, estimating uniaxial compressive and tensile strength using point load index test and receiving main physical and mechanical parameters of rock; determining rock quality designation RQD and obtaining other parameters such as joint space, joint surface roughness conditions, joint angle and ground water from field observation; According to above parameters, implementing RMR rock mass classification and Q system classification to judge the overall stability of iron mine; Comparing the overall stability results from RMR and Q system classification and stability results from 3D FEM numerical simulation on mining number II main ore body, number II′and number II 3 ore body, obtaining comprehensive evaluation of stability mining residual ore, and maximize the recovery of mineral resources under the premise of safety. This paper is significant for estimating the feasibility of mining residual ore and ensuring the general safety of mining it.The results showed that conclusions from RMR and Q system classification are consistent with the actual exploitation stability. Combing the above two empirical evaluation methods with theoretical FEM numerical simulation, rock mass stability can be analyzed more accurately, which plays a reference role in predicting and comprehensive evaluating rock mass stability in the future.
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