Method for recovering broken ore body by access sub-step roof popping

Abstract

The invention relates to a method for recovering broken ore body by access sub-step roof popping. The method comprises the following steps: in a process of recovering ore bodies in a strip manner in a vertical direction, before a working face is 4m far from ore-controlling main breakage, vertically supporting by a pipe seam type anchor vertical top panel after explosion every time, wherein anchor rods in each row are connected together through steel belts; when the working face is 4m far from the ore-controlling main breakage, machining a longitudinal anchor rod by a deformed steel bar; on the top plate of an access working face, longitudinally supporting the longitudinal anchor rod at an external insertion angle of 8-12 degrees; supporting the arch part of the access working face by a vertical pipe seam type anchor rod; after last time of explosion of the ore body close to the main breakage, temporarily supporting the main breakage face by left ores in a form of a shrinkage method, and then carrying out pipe seam type anchor rod roof popping support on the exposed main breakage face; and finally, fully shoveling the left ores for access popping filling. According to different exploring positions of a same access, the invention provides a safe supporting method adaptive to the positions and the supporting effect is good.

Description

[0001] technical field [0002] The invention belongs to the technical field of mining, and relates to a mining method for a broken ore body approach in a mine, in particular to a mining and supporting method for a broken ore body near an ore-controlling main fracture. Background technique [0003] In the mining process of broken ore bodies, the approach and filling mining method is generally adopted. The approach and fill mining method mainly includes the upward approach and fill mining method and the downward approach and fill mining method. The upward approach filling mining method has the advantages of simple mining process, low production cost, and relatively large production capacity of a single stope; the downward approach filling mining method is just the opposite, with complex mining technology, high production cost, and single stope production capacity. The production capacity of the stope is relatively small; however, the safety of the downward approach and fill ...

AI Technical Summary

Problems solved by technology

In this case, it is very easy to have the problem of insufficient anchoring force of a single anchor rod, which poses a hidden danger to safety.

When mining close to the main fault of the hanging wall of the ore body, the stability of the main fault is good, and most of the ore body of the hanging wall can be recovered; when the stability of the main fault is poor, in order to ensure safety, a 2-3m hanging wall roof protection is often left mines, resulting in massive losses of mineral resources

When mining is forced, it is very easy to cause the main fracture of the hanging wall to collapse, not only the hanging wall ore body of this layer is not easy to recover, but even the hanging wall ore body of the upper layer is not easy to recover, and it will also cause a lot of waste of mineral resources

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