A buffer blasting method for high bench and large aperture in open pit mine

A large-aperture, open-pit mine technology, applied in blasting and other directions, can solve the problems of large space height, small-aperture pre-splitting blasting efficiency, and many types of mine drilling rigs, so as to reduce the influence of slope stability and reduce instability Risk, the effect of reducing the amount of charge in a single hole

Active Publication Date: 2022-07-26
BAOTOU IRON & STEEL GRP
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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

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  • A buffer blasting method for high bench and large aperture in open pit mine
  • A buffer blasting method for high bench and large aperture in open pit mine

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Embodiment Construction

[0023] like figure 1 and 2 As shown in the figure, a buffer blasting method with high bench and large aperture in an open-pit mine, except for the last row of buffer holes 6 on the merged bench 2 of an open-pit mine, the rest of the normal blast holes 3 are arranged in a triangular manner, and the hole mesh parameters are according to Row spacing 5×hole spacing 4=(5.0~5.5)m×(15~16)m, super-depth is set to 2~2.5m according to lithology, 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; the 310mm large diameter blast hole is drilled with a roller cone drill. After the blast hole is qualified, the buffer hole 6 is charged in 3 sections with air intervals from bottom to top; normal blast hole 3. The charge is divided into 2 sections by the air interval, all the blastholes are filled, and the blasting method is adopted after the connection is made. On the 24.0m high step that has been merged, the comprehensive t...

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Abstract

The invention discloses a high-step and large-diameter buffer blasting method for an open-pit mine. On the high step near the mining boundary, by arranging buffer holes in the last row, the blasting technology of spacing charges in the holes can not only improve the depth of the blasting holes It can also reduce the impact of blasting vibration on the stability of the slope, improve the efficiency of the slope boundary, make the stope drilling rig equipment model single, and finally achieve efficient, safe and low-cost boundary operation.

Description

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

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Application Information

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Patent Type & Authority Patents(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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