Up and down hole combined cutting-well-free slot broaching method

Abstract

The invention provides an up and down hole combined cutting-well-free slot broaching method. The method comprises the steps that inclined down holes are constructed in corresponding positions of an upper layering rock chiseling roadway and a lower layering cutting transverse roadway through a down-the-hole drill, after the down holes are arranged and constructed, a lower ore roof falling zone andthe lower layering cutting transverse roadway serve as blasting free faces, and blasting is carried out to obtain a first blasting space; up slot broaching holes are mounted and constructed in the lower layering cutting transverse roadway, first blasting space formed through down hole blasting and the lower layering cutting transverse roadway serve as free faces, and segmented blasting is carriedout to form a complete cutting vertical slot. The down holes and up holes are combined to carry out slot broaching, the up holes take the blasting space formed by the down holes as the free faces, segmented blasting is carried out, the process is simple and reliable, and the method is safe and economic. The method is suitable for breaking ores, construction of a cutting well is not needed, high danger and cost of construction of the cutting well in fractured ore rock can be reduced, and giant application prospects can be achieved.

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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