Constructing method for mining embedded artificial boundary ore pillar from open-pit to underground mine

Abstract

The invention discloses a constructing method for mining an embedded artificial boundary ore pillar from an open-pit to underground mine. The constructing method comprises the following steps of: firstly, digging a trench at the boundary of an open-pit bottom ore body and surrounding rock as a transmitting road; secondly, carrying out robbing and filling on the ore body in the pit in three layers by adopting an upward drift filling method; requiring each layer of drift to overdraft and enter an upper-wall surrounding rock; after each drift is robbed, paving an artificial reinforced concrete false bottom and then filling; realizing the connection between every two filling units by connecting constructing ribs of adjacent drifts; after each layer of drift is robbed and filled, paving an artificial reinforced concrete false bottom in the trench and carrying out lap welding on connecting drift with constructing ribs of the trench; filling a layer height to next layer in the trench; and finally, forming the embedded artificial boundary ore pillar in the open-pit bottom. The pit bottom treatment is realized by using the method, so that the aims of recovering ore pillar resources, maintaining the slope stability, isolating open water burst, blocking off underground air leakage and stopping the influence on the underground production by external weather can be achieved.

Description

technical field [0001] The invention relates to mining technology, in particular to a method for constructing embedded artificial boundary ore pillars for open-pit to underground mining. Background technique [0002] As we all know, when the ore body of the mine is buried shallowly or there is an outcrop on the surface, open pit mining is suitable. open pit mining has back Recovery rate High, low dilution rate, large output, low cost and safe operation. However, because open-pit mining needs to strip a large amount of soil and rock to expose the ore body, its mining depth is greatly limited. With the increase of mining depth, open-pit mining will be transferred to underground mining because it is less and less suitable for mine production requirements. This method of first mining the upper part of the ore bed with the open-pit method and then transitioning to mining the lower part of the ore bed with the method of underground mining is called open-pit to underground min...

AI Technical Summary

Problems solved by technology

Due to the loose accumulation of rocks and uneven particles in this rock cover layer, there are a large number of gaps between the rocks, and the airtightness is poor, which will inevitably bring the following problems to production: First, during the rainy season, open-air catchment water and surface precipitation will directly pass through the cover from the pit Layers pour into the underground, which brings huge pressure to underground drainage, and also brings major safety hazards to production; second, the underground ventilation system is prone to air leakage and runaway phenomena, which makes it difficult for underground production ventilation management; third, the temperature drops in winter, cold The air directly enters the underground through the overburden, and the underground is prone to freezing. The frozen roadway will make it difficult for vehicles to drive, and the operating conditions will deteriorate, seriously affecting production efficiency.

Images