A kind of charge structure of blast hole and a kind of eyebrow line protection method

Abstract

The invention discloses a charge structure of a blasthole and an eyebrow line protection method. The first end of the blasthole (1) is closed, and the second end has a hole (2). In the charge structure , from the first end to the second end, the blast hole (1) sequentially includes a charge section (3) and a packing section (4), wherein the charge section (3) is at least close to the One side of the orifice (2) is an uncoupled charge section (32), and an uncoupled body (5) is arranged in the blast hole (1), and the uncoupled body approaches from the uncoupled charge section. One end of the first end extends toward the orifice (2); the brow line protection method includes: charging a plurality of blastholes (1) corresponding to the roadway (7), and making at least one blasthole (1) Having the charge structure described above. The charge structure of the blast hole of the present invention can effectively reduce the explosion damage to the ore near the eyebrow line near the hole, thereby protecting the eyebrow line.

Description

technical field [0001] The invention relates to the field of mining, in particular to a charge structure of a blast hole and an eyebrow line protection method. Background technique [0002] In underground mining operations, the boundary line retained after each blasting of the roadway is usually called the eyebrow line. A complete and regular eyebrow line is conducive to blasting operations and subsequent mining operations. Protecting the eyebrow line is important to ensure operation safety As well as the continuity and convenience of mining production organization is of great significance. [0003] For example, at present, when underground mines are mined by the sub-level caving mining method without pillars in China, when carrying out deep hole blasting construction, due to the limitation of construction conditions, the blast hole is charged with a continuous coupling charge structure. , after blasting in most blasting areas, the brow line of the rear row of holes (the fi...

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Problems solved by technology

[0003] For example, at present, when underground mines are mined by the sub-level caving mining method without pillars in China, when carrying out deep hole blasting construction, due to the limitation of construction conditions, the blast hole is charged with a continuous coupling charge structure. , after blasting in most blasting areas, the brow line of the rear row of holes (the first row of blasting holes next to the blasting area that has not been blasted) is raised or deformed (destroyed), so that the roadway cannot be found when the next blasting is carried out. All the blastholes of the first row of blastholes can't even be found in the first row of blastholes at all. In serious cases, other unexploded blastholes farther away are also buried by blast piles and cannot be found. The normal production organization and the blasting quality of the blasting area have laid a hidden danger to the safe production of the mine.

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