Study Of Dividing A Single Blast Into Two Parts Of Inclined Medium-thick Ore Body

Based on the inclined medium-thick ore body technique of diversion drawing with non-pillar sublevel caving method.The DSB technology of diversion drawing is put forward in this paper,and taking experiments compared with the experiments of cut-off inclined wall and diversion drawing.So,the stability of the diversion structure of diversion drawing is studied.The main conclusions are as follows:(1)On the basis of the technology of diversion drawing with non-pillar sublevel caving method,the research improved technology of DSB diversion drawing has been taked and the relevant experiments are compared.The improved diversion structure can directly block the contact between overburden rock and caving ore,so that some of the burden can be stoping by no dilution ore drawing.(2)With the inclined medium thickness ore body,the experiments cut-off grade of inclined wall ore drawing,dividing a single blast into two parts diversion drawing and diversion drawing have been taked.The results show that the ore recovery increases by 1%--2% with the dividing a single blast into two parts diversion drawing.The recovery rate of ore will be further improved by increasing the step distance of diversion structure.And compared with diversion drawing experiment,the recovery rate of ore decreased,because the recovery volume ratio of ore body is 2/3 less than diversion drawing.(3)The numerical simulation stability of diversion structural results show that the depth of ore body and the thickness of the diversion structure determine the stability of the diversion structure.For deep ore body mining,the volume ratio of ore body can be adjusted and the diversion structural thickness of ore body can be increased by the dividing single blast,which is of high maneuverability,safety and recovery.(4)The analysis of the maximum principal stress and the failure plastic zone shows that the roof of the diversion structure is dominated by the plastic failure of the pressure shear.The diversion structure of underground mining has large area of penetration,continuous failure and loss of stability.