High-risk jamb open-air deep hole cooperative recovery method

Abstract

The invention discloses a high-risk jamb open-air deep hole cooperative recovery method which comprises the following steps: dividing horizontal jambs (S1, S2, S3, S4 and S5) with superposition relationship or vertical jambs (K1, K2 and K3) with spatial association relationship or underground gobs (C1, C2, C3, C4 and C5) with association relationship with the jambs into a cooperative recovery subarea; and cooperatively recovering the horizontal jambs (S1, S2, S3, S4 and S5) and the vertical jambs (K1, K2 and K3) in the process of treating the gobs. By utilizing the method provided by the invention, cooperative treatment and recovery can be safely and efficiently performed on multilayer gobs and multilayer jambs.

Description

technical field [0001] The invention relates to an open-pit deep-hole collaborative mining method for high-risk ore pillars. Background technique [0002] For the ore pillar under the condition of metal mine empty area, two steps are required 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 two main methods, one is to fill the empty area with filling materials first, and then use the drilling and blasting method to return the mining pillar; the other is to firstly use the blasting method to collapse the roof of the empty area to treat the empty area, and then use the blasting method to return to the mining pillar. mining pillar. In the first method, conventional drilling and blasting methods can be used for back mining as long as the empty area is filled. However, the filling process of the empty area is complicated, the investment is large, the cost is high, and the mining efficiency of the pillar ...

AI Technical Summary

Problems solved by technology

For the high-risk mine pillars with multi-layer underground goaf conditions in the blasting area, the three-dimensional shapes of the goafs and pillars are extremely complex because the goafs overlap with each other and the levels of the goafs are different. There is a large difference in thickness, and the thickness of some horizontal ore pillars is only 6-10m. Therefore, it is difficult to guarantee operation safety and blasting effect by adopting the second method of mining

There are two bottleneck problems when adopting the second method to mine such high-risk ore pillars: one is that due to the restriction of complex three-dimensional conditions, the explosion energy does not match the energy of ore rock fragmentation, resulting in poor blasting effect; The lower thickness of the horizontal pillar is only 6-10m. When the upper pillar is subjected to mining blasting, the lower horizontal pillar will be severely damaged due to the blasting effect, but it will not collapse, which poses a great potential safety hazard. When dealing with the lower empty area under such conditions, safe operation cannot be guaranteed, and often collapses during operation, causing equipment damage and casualties

Therefore, the existing pillar mining methods and blasting methods are difficult to meet the needs of safe, efficient, and low-cost mining of high-risk pillars

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