Slope expansion and blasting method for mining deep concave open-pit mine by stages
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A technology of open-pit mines and deep holes, which is applied in blasting, ground mining, earthwork drilling and mining, etc. It can solve the problems of endangering the safety of equipment and transportation lines, reducing the production efficiency of electric shovels, and greatly affecting the organization, so as to reduce the front impact of blasting distance, guarantee mine production capacity, effect of reducing impact
Inactive Publication Date: 2011-07-06
ANSTEEL GRP MINING CO LTD
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These blasting methods have a great impact on the lower working area during blasting, which endangers the safety of equipment and transportation lines in the lower working area.
In order to solve these problems during side expansion, it is common to reserve a rock wall or a platform with a certain width without blasting temporarily, but this kind of side expansion blasting scheme has a great impact on the production organization, and at the same time greatly reduces the production efficiency of the electric shovel
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Embodiment 1
[0039] Under the condition that the width of the side expansion part is greater than 20 meters, a method of side expansion blasting in deep concave open-pit mining by stages is adopted, including the design of deep hole layout, perforation construction, setting detonators in deep holes, and loading explosives in deep holes Construction, carrying out the delayed detonation design of the surface network detonator, connecting and detonating the detonator in the blast hole and the surface network detonator, characterized in that:
[0040] 1) In the above-mentioned deep hole layout design, the blasting area control blast hole B is designed to be perpendicular to the slope top line A of the main stope, and the blast hole layout is 5 rows and 6 columns. The hole diameter of the deep hole layout design is 200mm, the hole spacing is 7.5m, the row spacing is 7.5m, and the hole depth is 15m.
[0041] 2) In the delayed detonation design of the surface network detonator, the detonation seq...
Embodiment 2
[0044] Under the condition that the width of the side expansion part is less than 20 meters, a method of side expansion blasting in deep concave open-pit mining by stages is adopted, including the design of deep hole layout, perforation construction, setting detonators in deep holes, and loading explosives in deep holes Construction, carrying out the delayed detonation design of the surface network detonator, connecting and detonating the detonator in the blast hole and the surface network detonator, characterized in that:
[0045] 1) In the above-mentioned deep hole layout design, the blasting area control blast hole B is designed to be parallel to the slope top line A of the main stope, and the blast hole layout is 3 rows and 10 columns. The hole diameter of the deep hole layout design is 200mm, the hole spacing is 7.5m, the row spacing is 7.5m, and the hole depth is 15m.
[0046] 2) In the delayed detonation design of the surface network detonator, the detonation sequence i...
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Abstract
The invention relates to a slope expansion and blasting method for mining a deep concave open-pit mine by stages. The method comprises the following steps: sequentially performing hole distribution design of deep holes, perforation construction, setting of primer detonators in the deep holes and the construction of charging explosive in the deep holes, performing time delay detonation design of the detonators in a surface network, connecting the detonators in blast holes with the detonators in the surface network, and detonating, and the method is characterized in that, under the condition that the width of the slope expansion part is greater than 20 meters, the hole distribution design of the deep holes is used for designing the blast holes in a control row of a blasting area to be vertical to a bench crest of a main stope, the time delay detonation design of the detonators in the surface network is used for designing the detonation sequence to hole-by-hole differential detonation, and the time delay detonation design of the detonators in the surface network is used for designing delay time of the detonators to enable the inter-hole detonator time delay to be shorter than the inter-row detonator time delay. Under the condition that the width of the slope expansion part is smaller than 20 meters, the hole distribution design of the deep holes is used for designing the blast holes in the control row of the blasting area to be parallel to the bench crest of the main stope, and the time delay design of the detonator is used for designing the delay time of the detonators to enable the inter-hole detonator time delay to be longer than the inter-row detonator time delay. The method is strong in operability, safe, practical and reliable.
Description
technical field [0001] The invention belongs to the technical field of deep-hole blasting in open-pit mining, and in particular relates to a side-expanding blasting method for staged mining of deep concave open-pit mines. Background technique [0002] At present, in domestic open-pit mines, the commonly used blasting method is deep-hole blasting in the staged mining blasting. Poor detonation scheme. These blasting methods have a greater impact on the lower working area during blasting, which endangers the safety of equipment and transportation lines in the lower working area. In order to solve these problems during side expansion, it is common to reserve a rock wall or a platform with a certain width without blasting temporarily, but this kind of side expansion blasting scheme has a great impact on the production organization, and at the same time greatly reduces the production efficiency of the electric shovel . Contents of the invention [0003] The object of the pres...
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