| In view of the technical requirements of engineering twenty million ore output every year in Sijiaying mine area.The proper fill blending ratio of-450 m initial mining level is determined by means of engineering analogy method,mechanics analysis method and numerical analysis method.On this basis,four kinds of stoping schemes have been proposed according to technical condition and assist engineering.The typical mining model in the third panel is established by using finite element software Midas-GTS.The stope stability of two-step mining is analyzed thoroughly.The rock in mine area is divided into four engineering geological petrofabric groups according to geological exploration combined with RMR classification method.The mechanical parameter of rock mass is determined by the usage of Hoek-Brown criterion.The self-support strength of cemented fill is analyzed and calculated by classical and limit equilibrant mechanical method.The rock and filling body matching model is established.Based on action effect between rock and different ratio backfills,and the economic benefit comparison,the best fill blending ratio1:8 is determined.Four kinds of stoping schemes have been put forward according to deposit mining technical condition and other key influence factors in south region.The third panel mining model is established by finite element software Midas-GTS,and the stope stability of different mining schemes are calculated.At the same time,the stope stability of two-step mining is analyzed deeply.The optimization of stoping scheme model is derived from analytic hierarchy process and fuzzy comprehensive evaluation according to six indicators such as maximum tension stress.Comprehensive evaluation result of four kinds of stope schemes relative to target layer are 0.8933,0.9140,0.8289 and 0.8383,whereby the second scheme is the best stoping scheme. |
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