Underground jack shaft uncovering method

Abstract

The invention discloses an underground jack shaft uncovering method. The method comprises the content of jack shaft positioning, preparation before uncovering, groove hollowing hole arrangement, groove expanding hole and chute hole arrangement, charging control, blocking, the detonating mode, the detonating sequence and the like. According to the method, the accurate position of a jack shaft is determined according to hand holes, the uncovering center of the jack shaft is positioned according to equipment, and accordingly the uncovering direction and size of the jack shaft can be guaranteed. When the explosive in a center bomb hole of a chute is detonated, free faces and compensation spaces are provided through empty holes around the center bomb hole, and the purposes of crushing and throwing rock in a groove hollowing frame are achieved. The depth of the center bomb hole is larger than that of the peripheral holes by 20-40 cm, the throwing force of the rock at the bottom of the groove hollowing frame can be strengthened, the rock in the groove hollowing frame can be completely thrown out, and the phenomenon of blocking in the chute is avoided by controlling the deflection angle of the bomb hole.

Description

Technical field [0001] The invention relates to a downhole chute controlled blasting technology, in particular to a method for uncovering the downhole chute. Background technique [0002] When the current underground chute is uncovered and blasted, it often happens that the uncovered position of the chute is not correct, which leads to inconvenience of the equipment out of the mine, resulting in a large area of ​​brushing and topping, which causes problems such as large exposed area and high maintenance cost; sometimes there is also chute angle control Improper uncovering of the phenomenon of poor quality that cannot meet production needs. This phenomenon is especially prominent when the upper and lower stratified mining and mining share the same chute. If the slope, length, and height of the chute are not properly controlled, it will easily lead to the upper stratified unloading. Causes the problem of ore spilling in the lower layer, or the problem of ore deposits and ore st...

AI Technical Summary

Problems solved by technology

[0002] When the underground chute is opened and blasted, it often happens that the position of the chute is not uncovered correctly, which leads to inconvenient mining of the equipment, resulting in a large area of ​​brushing and roofing, which results in a large exposed area and high maintenance costs; sometimes there is also a problem of chute angle control Improper unraveling results in poor quality and cannot meet the production needs. This phenomenon is especially prominent when the upper and lower layer mining and recovery share the same chute. If the slope, length and height of the chute are not properly controlled, it is easy to lead to the unloading of the upper layer. Lead to the problem of ore splashing in the lower layer, or ore accumulation and jamming at the chute when unloading in this layer

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