Room and pillar type medium-length hole filling mining method using bottom ore withdrawal structures simultaneously arranged in original rock

Abstract

The invention discloses a room and pillar type medium-length hole filling mining method using bottom ore withdrawal structures simultaneously arranged in original rock. The method comprises the following steps of: dividing an ore body into rooms and pillars arranged at intervals along the tendency, wherein a plurality of room and pillar stopes form a plate region; selecting an extra-pulse trackless development system; sequentially recovering the rooms and the pillars in the plate region; performing retreating row-by-row recovery from the second subsection during room recovery; filling a subsection of a goaf by adopting cement tailing with high cement-sand ratio after ore withdrawal of the rooms, then filling with cement tailing with low cement-sand ratio, and filling the top; recovering the pillars by using the same method as the room recovery from the first subsection during pillar recovery; filling a subsection of a goaf by adopting cement tailing with high cement-sand ratio after ore withdrawal of the pillars, then filling with plain tailing, and filling the top; and after recovery of the whole ore block is completed, reclaiming by adopting an access method. The method has the remarkable advantages of high stope production capacity, high mining work efficiency, high recovery rate, safe operation, low production cost and the like.

Description

technical field [0001] The invention relates to a composite mining method in which ore is extracted in stages in the stage of rock drilling and then filled, in particular to a room-and-pillar type medium-deep hole filling mining method in which the bottom ore structure is also arranged in the original rock. technical background [0002] The mining method of medium and deep hole segmental rock drilling followed by filling is a commonly used mining method with high efficiency, simple recovery process and good operation safety, but this method is only suitable for the mining room. If the mining method is adopted for all the mine pillars, it is difficult to form the bottom structure of the ore, and it is necessary to pre-build a concrete false bottom and false road in the filling body, resulting in unsafe operation, low efficiency, and high cost. [0003] For the pillar mining of thick and large ore bodies, most mines adopt the lower-efficiency upward layered filling mining meth...

AI Technical Summary

Problems solved by technology

As the ore pillars are affected by the damage and cutting of the medium and deep hole blasting during mining, the stability of the rock mass is greatly reduced, and the mining conditions of the ore pillars are extremely deteriorated. The long strips of ore pillars are surrounded by filling bodies on both sides. According to the mining sequence, when the bottom of the ore pillar is exposed, the ore pillar is completely supported by the cohesive force of the filling body on both sides, the tensile stress of the rock layer itself, and the cantilever beam of the upper and lower rock layers. When the stability of the ore pillar is poor, the upper ore The column may sink as a whole or collapse in a large area, causing major safety accidents

In addition, the upward layered filling mining method or the approach method are used for mining, the mining process is complicated, the labor intensity of the workers is high, the labor organization is complicated, the production capacity of the stope is small, the mining cost is high, and the loss rate is high

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