ABSTRACT
With gradual depletion of shallow resources, deep mining has become an inevitable trend in acquiring resources in the 21st century. However, the stress environment and engineering geological conditions of deep rock mass are more complex than those in shallow ones, and the ground pressure management is the main problem faced, while backfill mining can effectively solve the ground pressure problem in deep mining. Therefore, backfill mining is being widely used. The key technology in backfill mining is to control blasting and protect backfill. Currently, most of the mines that adopt approach filling mining method face problems such as over-excavation and under-excavation, which are serious issues, the amount of approach support works is large, and the maintenance cost is high. The filling body is seriously damaged during mining, which leads to serious tailing mixing and abnormal dilution and loss index. The construction cost is high. The root cause lies in the lack of effective protection and control of the filling body. In this paper, starting from the practice of route mining in the Jiaojia Gold Mine, through theoretical analysis and numerical simulation, the thickness of the reserved protective layer for blasting the temporary filling body is determined, the blasting scheme is optimized, the field industrial test is carried out, and good results obtained.
