Precontrol roof sublevel ore breaking once shaft forming method

Abstract

The invention discloses a precontrol roof sublevel ore breaking once shaft forming method. A blasting scheme using parallel deep holes as free surfaces is adopted; the parallel deep holes comprise an empty hole and charging holes; the charging holes comprise grooving holes (1)-(4), auxiliary holes (5)-(8) and peripheral holes (9)-(12); the grooving holes (1)-(4) are evenly distributed at the periphery of the empty hole in sequence; the gaps between each of the grooving holes and the empty hole are 300 mm; the peripheral holes (9)-(12) are also evenly distributed at the periphery of the empty hole in sequence; the distances of adjacent two peripheral holes are 2 m; the auxiliary holes (5)-(8) are respectively positioned in the middle positions of connecting lines of the grooving hole (4) and the peripheral hole (10), the grooving hole (3) and the peripheral hole (11), the grooving hole (2) and the peripheral hole (12) and the grooving hole (1) and the peripheral hole (9); the grooving holes (1)-(4), the auxiliary holes (5)-(8) and the peripheral holes (9)-(11) are connected through explosion guide pipes of 25 ms in sequence; the peripheral hole (12) is connected with the peripheral hole (9) through an explosion guide pipe of 65 ms; the charging holes and the empty hole are parallel to each other along full height of a courtyard; the empty hole serves as an explosion compensation space to detonate a detonator; and the grooving holes (1)-(4), the auxiliary holes (5)-(8) and the peripheral holes (9)-(12) are detonated gradually to achieve the section design requirements. The precontrol roof sublevel ore breaking once shaft forming method solves the problems of insufficiency of free surfaces and compensation space in a traditional precontrol roof sublevel ore breaking blasting operation, is high in mining efficiency, and guarantees the construction safety.

Description

technical field [0001] The invention relates to a one-time well-forming method of a pre-controlled top-segment section mine, which belongs to the field of pre-control top-segment section mine and subsequent filling mining. Background technique [0002] The mining method of pre-control top section mining and subsequent filling requires the construction of cutting shafts to provide free surfaces and compensation space for blasting operations. Generally, manual reverse excavation is used, which is difficult in safety management and high in construction costs. Contents of the invention [0003] According to the deficiencies in the prior art above, the technical problem to be solved by the present invention is to provide a one-time well-forming method of the pre-control roof subdivision mine which improves the mining efficiency, ensures the safety of the construction personnel and reduces the construction cost, which can solve the problem of the traditional pre-control roof. Th...

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Problems solved by technology

[0003] According to the deficiencies in the prior art above, the technical problem to be solved by the present invention is: to provide a method of one-time well formation of pre-controlled roof subsection mines that improves mining efficiency, ensures the safety of construction personnel and reduces construction costs, which can solve the problem of traditional pre-controlled roof. Insufficient Free Surface and Compensation Space of Blasting Operation in Sectional Mine

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