Mine underground downward drift two-step stoping controlled blasting method

Abstract

The invention discloses a mine underground downward drift two-step stoping controlled blasting method. The mine underground downward drift two-step stoping controlled blasting method comprises the following steps of: (1) determining a cutting method for section blasting and an arrangement form of auxiliary holes and peripheral holes; (2) determining a controlled blasting scheme and related parameters; (3) drilling blast holes according to the design scheme; (4) charging explosives into the blast holes: the charging coefficient of an annular cut hole is 0.9, the charging coefficient of a bottom hole is the same as that of the annular cut hole, 1-2 cartridges of explosives are charged in a cut empty hole, the charging coefficient of the auxiliary hole is 0.7, the charging density of a peripheral hole line is 0.3 kg / m, charging is conducted in a smooth blasting mode, and all the blast holes need to be blocked by water stemming; (5) detonating the network: detonating the cut holes and the auxiliary holes by adopting electronic detonators, detonating the peripheral holes by adopting detonating cords, and performing triangular lapping on the detonating cords; and (6) decoding digital electronic detonator, and then detonating. The mine underground downward drift two-step stoping controlled blasting method disclosed by the invention has the advantages that the cutting effect is good, the drilling depth is large, the blasting section is regular, filling bodies at the upper part and the edge part of the section can be protected, the blasting cost is low and so on.

Description

technical field [0001] The invention belongs to the field of rock drilling controlled blasting in underground mines, and in particular relates to a two-step recovery controlled blasting method for a downward approach in a mine. Background technique [0002] With the development of national science and technology, mine mining has gradually moved towards mechanization and automation, which has greatly improved mine production efficiency. At present, many mines have introduced rock drilling rigs for mining, which can move freely and have high flexibility. Compared with the previous drilling methods, the operating efficiency has been improved and the operating environment has been improved. However, due to the large volume of the rock drilling rig, it is difficult to drill wedge-shaped holes when the excavation section is small, resulting in poor cutting effect during blasting. In recent years, as a highly efficient, low-cost, and high-efficiency mining method, the downward app...

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Problems solved by technology

[0004] In view of the fact that the existing rock drilling rigs are difficult to drill wedge-shaped holes when the cross section is small, vertical cutting holes are often used underground, and the cutting space is relatively narrow, and it is difficult to throw rocks out. It is reasonable and seriously affects the blasting effect. Smooth surface blasting is rarely used in the top hole and the side hole. The commonly used millisecond delay detonator detonator is difficult to accurately control the blasting time of the blast hole and other technical problems. Two-step recovery control blasting method

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