Up and down holes combined with non-cutting well groove drawing method

Abstract

The invention provides a groove-drawing method for a vertical hole combined with a non-cutting well. In this method, a down-the-hole drilling rig is used to construct inclined downward holes at the corresponding positions of the upper layer rock drilling roadway and the lower layer cutting horizontal roadway. After the downward hole layout is completed, the lower ore body caving area and the lower layer are cut. As the blasting free surface, the blasting is carried out to obtain the first blasting space; the upward drawing slot holes are arranged and constructed in the lower layer cutting lane, and the first blasting space and the lower layer cutting lane formed by the blasting of the down hole are free surfaces, which are divided into Segment blasting forms a complete cutting vertical groove. The invention adopts the combination of the downward hole and the upward hole to carry out the slotting, and the blasting space formed by the upward hole and the downward hole is used as a free surface, and segmental blasting is carried out, the process is simple, reliable, safe and economical. The method is suitable for crushing ore bodies without constructing cutting shafts, which reduces the high risk and cost of constructing cutting shafts in broken ore rocks, and has great application prospects.

Description

technical field [0001] The invention relates to the technical field of mining, in particular to a method for pulling grooves in a vertically directed hole combined with a non-cutting well. Background technique [0002] When the stope is recovered, the cutting lane and the cutting patio are generally arranged at the end or the middle of the stope, and the cutting patio is used as the free surface to vertically pull the mining area to form a cutting groove. The formation of the cutting groove is the last process before mining in the mine, and it is also a very important process. Its purpose is to provide a free surface and enough compensation space for the stope blasting, and prepare for large-scale mine collapse. [0003] At present, the most commonly used grooving method is the vertical deep hole grooving method. Cutting cross-cuts are arranged in the direction perpendicular to the sectioned rock drilling roadway, and medium-deep holes or deep holes are drilled in the cuttin...

AI Technical Summary

Problems solved by technology

However, the problem of this method is that the construction workload of the medium and deep holes outside the vein is large, the cutting groove single-stage blasting process is difficult, and additional rock drilling outside the vein is required.

However, this method of slotting has the disadvantages of high construction accuracy requirements for oblique symmetrical forced slotting blastholes, and large slotting with the top-over area as the free surface blasting.

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