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Strip mine high-step large-aperture buffer blasting method

A technology for large-aperture and open-pit mines, applied in blasting and other directions, can solve the problems of large receiving space, low pre-split blasting efficiency of small-aperture, and many types of mining rigs, so as to improve operational safety, reduce instability risks, and reduce The effect of single-hole charge

Active Publication Date: 2020-07-10
BAOTOU IRON & STEEL GRP
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AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a high-step and large-aperture buffer boundary blasting in open-pit mines, aiming at the problems of large height of the receiving space when the existing merged steps are close to the boundary, low efficiency of the existing small-aperture pre-splitting blasting, and many types of mine drilling rigs. method

Method used

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  • Strip mine high-step large-aperture buffer blasting method
  • Strip mine high-step large-aperture buffer blasting method

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Embodiment Construction

[0023] like figure 1 and 2 As shown, a buffer blasting method with high steps and large apertures in an open-pit mine, except for the last row of buffer holes 6 on the merged step 2 of the open-pit mine, the rest of the normal blast holes 3 are arranged in a triangular manner, and the hole network parameters are according to Row spacing 5×hole spacing 4=(5.0~5.5)m×(15~16)m, ultra-deep setting is 2~2.5m according to lithology, and the hole spacing of buffer hole 6 is 1 / 4 of that of normal hole 3 ~2 / 3, the buffer hole 6 is not set to be super deep; drill a 310mm large-diameter blast hole with a roller drill, and after the blast hole is accepted, the buffer hole 6 is divided into three stages from bottom to top with air intervals; normal blast holes 3. The charge is divided into two stages with air intervals, and all blastholes are filled and detonated by hole-by-hole detonation after connecting the wires. On the 24.0m high step of the merged section, the comprehensive technolo...

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Abstract

The invention discloses a strip mine high-step large-aperture buffer blasting method. The method can improve the effective utilization rate of the depth of blast holes and reduce the influence of blasting vibration on the stability of a side slope on a high step close to a mining boundary through a blasting technology of distributing buffer holes in the last row and filling explosives in the holesat intervals, so that the slope boundary efficiency is improved, the model of stope drilling machine equipment is simplified, and finally efficient, safe and low-cost boundary operation is achieved.

Description

technical field [0001] The invention relates to the field of engineering blasting, in particular to a high-step and large-aperture buffer blasting method in an open-pit mine. Background technique [0002] At present, the existing expansion method of open-pit mines is to expand outward layer by layer according to the original bench level, and the height of the bench is usually 12-15m. Protect the stability of the slope and complete the border work. However, when working near the boundary, it is often faced with the situation that conventional steps are overlapped and the height of the steps is doubled. However, the conventional small-aperture double-stage pre-split boundary blasting method not only makes the construction cost high, but also increases the height of the steps. The hole diameter is small, the hole depth is large, and it is difficult to form holes when the drill pipe is pulled out; in the conventional small-aperture pre-split blasting construction process, the p...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F42D1/00F42D1/08F42D3/04
CPCF42D1/00F42D1/08F42D3/04
Inventor 张波宋金龙刘占全崔凤徐晓东郭一娜顾春雷裴斌郭建新宝音吉雅杜文秀付明宇贾永强师文强闫永富李海龙黄大江
Owner BAOTOU IRON & STEEL GRP
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