Medium-deep hole room pillar mining method for limestone underground mine mining

Abstract

The invention discloses a medium-deep hole room pillar mining method for limestone underground mine mining. The method comprises the steps of: S10. exploiting a ramp, tunneling a first intermediate section haulage roadway along the front end of a to-be-mined stope room from the ramp, and tunneling an air return roadway along the rear end of the to-be-mined stope room from the ramp; S20. dividing an upper sub-layer and a lower sub-layer; S30. stoping the upper sub-layer, tunneling a roof cutting roadway, conducting slope expansion on the roof cutting roadway to form a roof cutting space in the stope room, transporting the ores generated by slope expansion out of the ground surface by the ramp; and S40. stoping the lower sub-layer, tunneling a second intermediate section haulage roadway from the ramp, blasting the lower sub-layer, and transporting the generated ores out of the ground surface by the ramp. The method provided by the invention has the advantages of small mining preparation workload, simple process and good ventilation conditions, etc. The labor production efficiency is high, the mining cost is low, and the ore block production capacity is large. The method can reduce the number of underground workers, shorten ore block stoping time, reduce the exposure time of workers in an open stope, and prevent roof fall accidents, and is a safe and efficient mining method.

Description

technical field [0001] The invention is used in the technical field of mining engineering, and in particular relates to a room-and-pillar mining method with medium and deep holes for mining underground limestone mines. Background technique [0002] At present, limestone underground mines are mainly mined by the shallow hole room and pillar method of leaving point pillars or continuous pillars. In the mines mined by this method, the mines are mostly unplanned roadway layout and forward mining. The mining working face is set randomly, crossing left and right, overlapping up and down, and most of the transportation roadways are mining working faces. The shallow-hole room-pillar method generally has the disadvantages of high labor intensity, low production efficiency, and poor ventilation conditions. Due to the small production capacity of shallow-hole room-and-pillar mines, frequent rock drilling and blasting work, and heavy dust pollution seriously affect the health of worke...

AI Technical Summary

Problems solved by technology

Shallow-hole room-and-pillar methods generally have the disadvantages of high labor intensity, low production efficiency, and poor ventilation conditions.

Due to the small production capacity of the shallow-hole room-and-pillar mine, frequent rock drilling and blasting, and heavy dust pollution seriously affect the health of workers

When working in an empty field, it is difficult to control the roof, and it is easy to cause roof caving and slabs. Rock caving often occurs, causing property losses and casualties, and there are some unsafe hazards.

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