Abstract:Purpose: In order to solve the problems of large support amount, low efficiency and high cost of excavation laneway in backfill in the two-step stope mining of open stoping with subsequent backfilling method and to realize the purpose of rapid prototyping of the mining laneway in the two-step pillar stope, this paper carried out process method research on the pre-formed laneway in backfill for an iron mine in China. Method: The methods of investigation, theoretical analysis and experiment were adopted. By analyzing the force of the preformed carrier and conducting material research on the preformed carrier, rubber pneumatic bag was selected as the preformed carrier. Based on the underground mining conditions, the prefabricated carrier layout scheme was designed and the industrial test was carried out. Result: The experimental results show that the filling height shouldn’t exceed 2 m at a time when using rubber pneumatic bag as the preformed carrier to avoid damage, that the dimension determination of the prefabricated carrier should consider the laneway section parameters and the transportation and installation of the prefabricated carrier, and that the construction efficiency can be increased by nearly 5 times and the construction cost can be reduced by 44% compared with drilling and blasting method. The damage to the backfill body can be avoided by drilling and blasting method, and the support cost can be reduced. Significance: In this paper, rubber pneumatic bag is used as a preformed carrier, which is placed in the pre-formed laneway before the one-step stope backfilling, and shrinks the rubber pneumatic bag to form laneway after the filling slurry solidified. The research results can be used as reference for similar mines in domestic.