A small segmental approach filling mining method for vertical middle and deep hole falling

Abstract

The invention discloses a mining method employing sublevel filling during medium-depth holes blasting in stoping accesses. Top-bottom sectionalized drilling drifts in the same stoping access are aligned; vertical medium-depth holes are drilled in the top sectionalized drilling drift during stoping; millisecond blasting is adopted so as to reduce the explosive consumption for one time; periphery holes of the top sectionalized drilling drift and vertical side holes of two sides of the stoping access are subjected to smooth blasting; a local unstable area of a support plate is supported in time, so that the access top plate and the two sides of a mined-out area after blasting are flat and smooth; the phenomenon that large blocks overhang and protruding of the side walls is avoided; meanwhile, small sections and arched support plates are adopted, and broken ores left in the field balance the deformation of the two sides of the mined-out area, so that the ground pressure of the mined-out area is managed in a reasonable and economical way. The powerful safety guarantee is provided for carry-scrapers when the carry-scrapers enter the mined-out area and carry the ores. According to the mining method, the layout is simple and feasible, the operation efficiency is high, and the ratio of drifting meters over mining tonnages and the stoping cost are low. The mining method is easy to popularize in small and medium-sized non-ferrous metal mines.

Description

technical field [0001] The invention relates to the underground mining technology of metal mines, especially the approach-type filling mining method. Background technique [0002] Avoiding rock drilling and blasting operators working for a long time in a space with a large exposed area of ​​the roof is the most effective method to prevent roof fall accidents in stopes and ensure safe production in mining. The upward approach filling mining method has a small exposed area of ​​the stope roof, but it requires a large amount of mining engineering, many filling retaining walls are erected, the mining operation efficiency is low, and filling and roof connection is difficult, so it is difficult to use in some mines. This method is suitable for The mining cost of ore bodies with higher value and richer grades is relatively high for general non-ferrous metal mines, which is not conducive to cost control. Although the segmented filling mining method also avoids the way that rock dri...

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Problems solved by technology

The upward approach filling mining method has a small exposed area of ​​the stope roof, but it requires a large amount of mining engineering, many filling retaining walls are erected, the mining operation efficiency is low, and filling and roof connection is difficult, so it is difficult to use in some mines. This method is suitable for The mining cost of ore bodies with higher value and richer grades is relatively high for general non-ferrous metal mines, which is not conducive to cost control

Although the segmented filling mining method also avoids the way that rock drilling and blasting operators work in an environment with a large exposed area of ​​the roof, it adopts fan-shaped blast holes, and the upper and lower segmented rock drilling roadways are arranged staggeredly. Extremely uneven, dangerous rocks hanging upside down are common, and it is difficult to carry out the operation of knocking on the roof and top, which poses a threat to the safety of the LHD driver and other personnel in the subsequent mining operations

The VCR method adopts large-diameter deep holes to carry out spherical charge blasting in stages to drop the ore. After the mining is completed, the area of ​​the mine room is large. For the ore body with poor stability to ordinary ore bodies, it is easy to produce large-area slabs. For small and medium-sized non-ferrous It is difficult to apply to metal mining enterprises, non-steeply inclined ore bodies, and small and medium ore bodies with complex ore-rock boundary changes

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