Slope expansion and blasting method for mining deep concave open-pit mine by stages

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...

AI Technical Summary

Problems solved by technology

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

Images