用沙坝矿急倾斜破碎矿体属于难采矿体。由于矿体破碎,脉内凿岩巷道难以进行支护,作业环境安全性差。对急倾斜破碎矿体现场条件进行调查研究后,在原预护顶分段凿岩阶段空场嗣后充填采矿法基础上加以改进,采用再造顶板下向分段交错充填法。该方法在分段上部再造1个钢筋混凝土顶板;且上下分段矿房矿柱交错布置,可对上部矿体起到部分支撑作用,有效防止了上部破碎矿体垮落,工人可在顶板护顶下进行安全高效作业;由于分段高度增加,凿岩效率得到进一步提高,采场生产能力并未由于顶板再造工序的增加而降低,可满足矿山生产需求。

The steep incline and fractured ore-bodies in Yongshaba mine belong to the category of difficult-to-mine ore-bodies. They are extremely fractured, leading to a lot of problems in the actual production. Such as, the in-vein drill drifts are difficult to support and the working environment is dangerous. After studies of the ore-body conditions, it is decided to adopt the method of reconstructing the manual roof and filling the downward sublevel stagger based on the pre-design sublevel rock drilling stage vacant stope backfill mining method. A reinforced concrete sub-top is reconstructed on the stope, staggered arranging the stope and the up and down sublevel pillars are built to support the upper ore-body, so the workers can work under the protection of the sub-top. Due to the increased sublevel's height, the drilling efficiency is further improved, and the stope production capacity is guaranteed. The mine can have safe and efficient productions. The improvement method is applied successfully in the mine.