Open-bench blasting method capable of controlling forward stroke of blasting muck pile

Abstract

An open-bench blasting method capable of controlling a forward stroke of a blasting muck pile comprises the steps of conducting deep hole arrangement, conducting drilling construction, arranging initiation bombs and detonators in deep holes, mounting explosives in the deep holes, conducting detonator delayed initiation design on an earth surface network in the same blasting area, connecting the detonators in the blast holes with detonators of the earth surface network, and initiating the detonators. The method is characterized in that the detonator delayed initiation design of the earth surface network in the same blasting area is that the blasting area is divided into an earlier initiation control area and a later initiation control area which are initiated in sequence, and blasting occurs in the two initiation areas at one time. According to the method, as the blasting area is divided into the two initiation areas, the earlier initiation control area is initiated to provide the later initiation control area with a moving space for containing goods supply and create a free face space condition for the blasting of the later initiation control area. The forward stroke of the blasting muck pile can be controlled precisely and effectively. The safety of the mining operation is ensured, the assistant workload of an electric shovel is reduced, the production efficiency is improved, and the damage and loss caused by the blasting can be reduced.

Description

Technical field: [0001] The invention relates to the technical field of mining, in particular to a blasting method for controlled blasting pile forward in open-air step blasting. Background technique: [0002] Open-air step blasting, also called step blasting, refers to the method of drilling holes on a pre-designed open-air step-shaped excavation surface and loading columnar charges for blasting operations. It is the most widely used blasting method in modern blasting engineering. Large-scale excavations such as open-pit mining, railway and road cutting engineering, hydropower engineering, trench foundation pit excavation, and underground cavern excavation are inseparable from step blasting. [0003] When step blasting is carried out in the open air, the ore and rock to be blasted will move forward to form a loose pile of ore and rock, and the distance moved forward is the forward charge of the blast pile. [0004] The effective control of the front dash of the blast pil...

AI Technical Summary

Problems solved by technology

The first disadvantage is that the forward control ability is small, and the second is that three free surfaces are required

[0008]1 While the open-air step blasting controls the blasting pile forward, it has different degrees of impact on the blasting quality, and there are many large pieces, which affect the efficiency of shoveling operations;

[0009]2 Under the condition that the blasting steps have only two free surfaces, the requirements for better control of the blasting front cannot be met;

[0010]3 The blasting area adopts a blasting sequence method in one blasting, and the reliability of successfully controlling the blasting is low for important parts that require high control distance accuracy

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