Optimization On Ore Drawing In Transient Sublevel Stope During Adjusting The Structure Parameter Of Sublevel Caving Method Without Sill Pillar

The development trend of sublevel caving method without sill pillar is increasing the stope structural parameter, so the problem of how to make transition of stope structural parameter from ordinary space to large space is existed in many mines. This paper take Jinshandian iron mine for example, in the light of the ore drawing problem in transit sublevel, taking the theory of pillarless low-dilution for ore drawing as guiding ideology, proposes optimizing ore drawing mode of the synthesis considered sublevel drawing and obtains corresponding independent advance of ore breaking ,and in this commentary, the measure of the most superior ore drawing is produced, ;namely blasting optimization, drawing management and control of limiting grade of drawing ore.Using large and small access space at transit sublevel is put forward in term of special circumstances of the footwall contiguity zone , Recovery index is advanced and a new optional method is found for organization and production of transit sublevelAccording to breaking interval and geometry characteristic of transit sublevel,optimum blasting design is proposed and blasting vibration is on site testing; destroying instance of blasting to stoping drift is analyzed in order to confirm the security of blasting scheme...