Three-dimensional zoned collaborative caving mining method for pillar groups

Abstract

The invention discloses a three-dimensional zoned collaborative caving mining method for pillar groups. The method comprises that: taking stability significantly correlated pillar groups in a large and empty environment as a collaborative caving unit, conducting zoning within a three-dimensional solid of the collaborative caving unit, with each zone as a blasting zone with an independent free surface and a compensation space; carrying out blasting for one time to all zones within the caving unit through short-delay blasting or simultaneous blasting between zones to realize collaborative caving; making the blasting directions of all zones form mutual extrusion, with a continuous or discontinuous blasting initiation sequence in space among zones; leaving the blasting initiation sequences and blasting directions of blast holes within different zones mutually uncorrelated. The method of the invention is suitable for collaborative stoping of a plurality of pillars and treatment of multiple empty zones in a big and empty zone environment. The method provided in the invention completes empty zone treatment and pillar stoping in one step, thus providing a safe, efficient, productive and low-cost solution to underground mining of pillar groups in a big and empty zone environment.

Description

technical field [0001] The invention relates to an underground mining method for metal mines, in particular to a three-dimensional divisional cooperative caving mining method for ore pillar groups in a large empty area environment. Background technique [0002] Existing mining methods are subject to many constraints when performing underground mining on the pillar group under the condition of metal mine goaf, and generally all need to implement two steps to complete. The first step is to deal with the empty area, and the second step is to return to the mining pillar. There are mainly two methods. The first method is to fill the empty area with filling materials first, and then use the drilling and blasting method to return the mining pillar; the second method is to use the drilling and blasting method or cavern blasting method to collapse the empty space The roof of the area is used to treat the empty area, and then the drilling and blasting method is used to return to the ...

AI Technical Summary

Problems solved by technology

The second method needs to use the blasting method to deal with the empty area at first, which is easy to damage the ore pillar, and often leads to major safety hazards when the ore pillar is returned. serious

For pillar groups in the environment of large underground voids, it is difficult to effectively blast interrelated pillar groups with structurally stable systems in one blasting area. serious safety hazard

Therefore, for the mining of ore pillars and ore pillar groups in the environment of large goafs, there has been no good solution at home and abroad, which cannot meet the needs of safe, efficient, and low-cost mining of pillar groups in goaf environments, resulting in Frequent safety accidents, resulting in a large loss of pillar resources

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