Deep hole blasting method

Abstract

The invention provides a deep hole blasting method which is used for mining in level pillars with empty areas below. The deep hole blasting method includes the following steps: S1, a plurality of vertical deep holes are drilled downwards in the upper surface of a to-be-blasted level pillar, the plurality of deep holes form a deep hole beam, and each deep hole is communicated with an empty area; S2, strip-shaped explosive is filled in each deep hole from bottom to top; and S3, a lower free face of the level pillar is used as a blasting free face, the empty area is used as a blasting ore-falling area, and the strip-shaped explosive in the deep hole beam is blasted along the axial direction of the strip-shaped explosive. According to the deep hole blasting method, when the strip-shaped explosive in each deep hole blasts, blasted objects are thrown out towards the axial direction of the strip-shaped explosive, then axial-direction blasting is formed, and therefore even if the hidden danger empty area exists below the level pillar, the lower free face of the level pillar is used as the blasting free face, extraction on the level pillar can be achieved through one-time blasting operation without cutting operation, and safety and mining blasting efficiency are high.

Description

technical field [0001] The invention relates to the technical field of mining blasting, in particular to a deep hole blasting method. Background technique [0002] Mining of hard rock ores is generally carried out by drilling and blasting. The deep hole blasting method is one of many drilling and blasting methods and is often used. The existing deep hole blasting methods are all radial blasting, that is, blasting in the radial direction of the explosive charge, mainly including the deep hole strip charge lateral blasting method and the deep hole spherical charge layered blasting method. [0003] In the lateral blasting method of deep-hole strip-shaped charge, the blasting free surface is parallel to the axis of the deep hole or obliquely at an acute angle, and the charge is filled in the deep hole, and blasted toward the free surface, that is, toward the radial direction of the strip-shaped charge. Caving ore. The deep hole lateral blasting method in which the blasting fr...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a deep hole blasting method with high safety and high blasting efficiency, so as to solve the technical problem in the prior art that multiple blasting is required for mining horizontal pillars with empty areas below, and there are potential safety hazards

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