Gently Inclined Thick Oxide Ore Mining, Mining Sequence And Structural Parameters Of The Optimization Study

Presently, as the largest high-quality oxidized ore tin deposit of china, "DaMaLu "ore blockCincluding DaQingDong ore block, MaChiShui ore block and LuTangBa ore block) of SongShuJiao's Tin Mine of Tin Corporation of YunNan is prime production base and major construction project of Tin Corporation of YunNan during the period of 10th 5-year plan.In consideration of the mining conditions of the gentle -dipping and medium-thickness oxide ore body of LuTangBa ore block of SongShuJiao's Tin Mine of Tin Corporation of YunNan, roof pre-cut, roof pre-support open stope method adopted is reasonable now. Three-dimensional finite element numerical analog analysis technique is used to optimize extractive sequence and the stope structure parameters, to simulate the measure of roof control, the influence of site-stress and ultimate exposed area and to set up the safety evaluation system of this mining method. A serial of roof sagging time and critical value, measured by field-monitoring, has provided basis for pressure control. The research achievement has provided the direction for reliable mining and safe production and received good economic benefits and remarkable social benefits.In consideration of the characteristics of research object, the paper has paid attention to the influence of material characteristics, even has emphasized the influence of construction factor, especially has stressed the influence of excavation sequence, fractional cutting and fractional support, which is not only research characteristics and novelty of the paper, but also important respect on the stability study of engineering rock that should be strengthened in future.