中国矿山工程

In response to the problem of determining the reasonable position of the access route during the mining of a steeply inclined medium thick ore body in a certain iron mine using the Sublevel caving method , combined with the similarity simulation and numerical simulation (PFC3D) method, a study was conducted on the optimization of the position of the access route along the strike of the ore body. Taking the dip angle of the ore body as 85° and the average thickness of 20 m as the research object, there is a problem of residual ore recovery in the ridge area of the conventional straight layout approach. Therefore, a comparative analysis is conducted on the mining indicators and loose material transportation rules of the upper and lower segmented straight layout (staggered distance of 0 m) and staggered layout (staggered distance of 3 m, 6 m). The research results show that the mining effect is better when the upper and lower segmented access roads are horizontally staggered by a distance of 6 m: in numerical simulations, the ore recovery rate reaches 86. 34% and the ore impoverishment rate drops to 17. 07% , while in similar experiments, the ore recovery rate is 84. 79% and the ore impoverishment rate is 15. 55% , and the trend of the two results is consistent. This study effectively solved the problem of difficulty in recovering residual ore from the ridge of the upper segmented mining route in the lower segmented mining.