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Blasting method capable of improving step deep-hole blasting quality by using auxiliary blasthole

A technology of deep hole blasting and blast hole, which is applied in the field of blasting, and can solve problems such as high large block rate and affect the normal operation of mine production, and achieve the effects of reducing large blocks, improving blasting quality, and increasing energy utilization rate

Inactive Publication Date: 2015-12-30
NORTHWEST RES INST OF MINING & METALLURGY INST
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Problems solved by technology

[0002] The high rate of chunks in step deep hole blasting is a common problem in open-pit mines, which seriously affects the normal operation of mine production

Method used

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  • Blasting method capable of improving step deep-hole blasting quality by using auxiliary blasthole
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  • Blasting method capable of improving step deep-hole blasting quality by using auxiliary blasthole

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Embodiment Construction

[0019] The present invention will be further described below:

[0020] A blasting method that uses auxiliary blast holes to improve the quality of stepped deep hole blasting. The method follows the following steps:

[0021] The first step, such as figure 1 , figure 2 As shown, on the steps of the blasting zone, the main blasting hole 1 with a diameter of 80mm or more is drilled according to the matrix layout method. The main blasting hole 1 is set at the front of the step and the vertical setting at the rear of the step. Steps in the blasting zone. The first 1-3 rows of the steps in the blasting zone use inclined blast holes, and the main blast hole 1 and auxiliary blast hole 2 in the back row use vertical holes; other blasting parameters of the main blast hole 1 are in the design and construction Follow the normal stepped deep hole blasting design and construction principles;

[0022] The second step is to drill the auxiliary blast hole 2 with a diameter of 75mm in the middle betw...

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Abstract

The invention belongs to the technical field of blasting methods, and particularly relates to a blasting method capable of improving step deep-hole blasting quality by using an auxiliary blasthole, which comprises the following steps: determining the auxiliary blasthole, determining the depth of the auxiliary blasthole, selecting different explosives for the blasthole, and determining the detonation mode. The auxiliary blasthole 2 is arranged between the deep-hole blastholes, thereby solving the problem of overhigh bulk rate on the step upper part due to the overhigh blasthole blockage length, overlow charging center of gravity and other conditions in production. The vertical blasthole-oblique blasthole combination mode is adopted to effectively improve the blasting quality on the premise of not influencing the perforation-blasting combined efficiency. According to the principle that the diameter of the blasthole should be approximate to or slightly greater than the limit diameter of the explosive, different explosives are selected for the auxiliary blasthole 2 and main blasthole 1, thereby creating ideal detonation conditions for the explosives and enhancing the energy utilization efficiency of the explosives.

Description

Technical field [0001] The invention belongs to the technical field of blasting methods, and particularly relates to a blasting method for improving the quality of stepped deep hole blasting by using auxiliary blast holes. Background technique [0002] The high block rate during step deep hole blasting is a common problem in open-pit mines, which seriously affects the normal operation of mine production. In practice, it is found that due to the fact that the length of the blast hole blockage is too large and the center of gravity of the charge is low in actual production, the upper part of the blast hole and the orifice are less damaged by explosives, and the blast hole blockage section on the upper part of the step is large. The block rate is usually higher than other locations. Therefore, adopting appropriate measures to reduce the bulk rate of the orifice is of great significance for strictly controlling the bulk rate of step deep holes as a whole and improving the blasting q...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F42D1/00F42D3/04
Inventor 郭生茂雷明礼张海磊刘武团严文炳陈小平焦满岱柴衡山刘涛孟慧媚
Owner NORTHWEST RES INST OF MINING & METALLURGY INST
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