A cutting method for sub-cave mining

Abstract

The invention discloses a cutting method for sublevel caving mining. The upward excavation is performed in a cutting roadway. The cutting method is characterized by comprising the following steps: (a), uniformly forming two rows of large-aperture medium-length holes in parallel in a position in which a cutting well is about to be dug according to the design height of the cutting well, uniformly forming two rows of blasting medium-length holes along the cutting roadway side of each row of large-aperture medium-length holes in parallel, performing millisecond blasting on the two rows of blasting medium-length holes, uniformly forming a third row of blasting medium-length holes behind the second row of blasting medium-length holes in parallel, and performing secondary blasting, wherein the large-aperture diameter of each large-aperture medium-length hole is 120mm to 200mm, a hole-edge interval is 100mm to 150mm, the aperture of each blasting medium-length hole is 55mm to 75mm, and a hole interval in the third row of blasting medium-length holes and the row distance between the second row of blasting medium-length holes and the third row of blasting medium-length holes are 500mm to 600mm; (b), uniformly forming blasting medium-length holes in sequence row by row in parallel behind the third row of holes, and performing one-row blasting one time or two-row millisecond blasting one time, wherein the hole interval and the row distance are 800mm to 1,200mm.

Description

technical field [0001] The invention relates to a cutting method for subsection caving mining. Background technique [0002] The segmental caving mining method is a method commonly used in underground mining of metal mines. The mining operation of this mining method is carried out in the mining roadway. The cutting roadway is basically perpendicular to the mining roadway. There is a cutting well at the end of the cutting roadway to cut The well is used as a free surface. In the cutting roadway, the cutting medium and deep hole blasting is carried out, and the free space for the front row of middle and deep hole blasting is pulled out, and the front row of the middle and deep hole blasting is carried out to carry out the mining operation. [0003] Its cutting is carried out in the cutting roadway in each segment back to the mining block, and its cutting method is: [0004] One is to cut the well at both ends or one end of the cutting roadway first with the common method (the...

AI Technical Summary

Problems solved by technology

[0009] One is that the cutting wells need to be manually cut. The height of the cutting wells is generally about 15-25m. There are safety hazards such as high-altitude operations, gun smoke poisoning, and roof caving. The excavation construction is difficult and the construction period is long.

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