论文部分内容阅读
我矿是一个生产了20多年的矿山,开采深度已下降了400余米。上部用空场法回采的几个大矿体围岩已崩落至地表,形成厚达150米的覆盖层。因此,有利于对深部矿体采用崩落法开采。目前国内采用的无底柱分段崩落法,多为单分段崩矿,一般放矿高度为15～17米,因而存在以下几个方面的问题: 1.采准工作量大,达50～60(米~3/千吨); 2.进路矿量少,爆破一次仅能出矿千吨左右,爆破次数频繁,降低了回采强度与矿块生产能力; 3.贫化率高,一般在20％左右;
Mine is a mine that has been producing for more than 20 years and the mining depth has dropped by more than 400 meters. The rock mass of several large ore bodies recovered from the upper part by the open field method has fallen to the earth’s surface to form an overburden with a thickness of 150 meters. Therefore, it is conducive to mining the deep orebody by caving method. So far, there are some problems in the following aspects: 1. The workload of quasi-admitting work is large, up to 50 ~ 60 (m ~ 3 / kiloton); 2. The amount of ore into the road is less, blasting only once out of ore about one thousand tons, frequent blasting, reducing mining strength and ore production capacity; 3. Dilution rate is high, Around 20%