Charging structure for controlling blasting tight bottom of strip mine

Abstract

The invention relates to the technical field of blasting mining, in particular to a charging structure for controlling a blasting tight bottom of a strip mine. The charging structure is characterized in that a block body is arranged at the bottom of a blast hole and is provided with a plurality of inclined surfaces. According to the charging structure, through the arrangement of the inclined surfaces, it is ensured that detonation waves generated by explosion are propagated in the internal direction or the specified direction of a horizontal blasting area of the bottom surface after reaching the inclined surfaces to be reflected; the detonation waves generated by blasting are directionally and parallelly propagated along the bottom surface of a drill hole under the action of conical surface reflection, so that it is ensured that the designed bottom surface is smooth, the generation of the tight bottom is reduced, and the target of efficiently breaking rocks is achieved; the charging structure is suitable for an explosive filling method for improving blasting bottom surface forming of the strip mine; and the method is wide in application range, does not need special processes and materials, is low in construction cost, simple in process and good in blasting effect.

Description

technical field [0001] The invention relates to the technical field of blasting mining, in particular to a charge structure for controlling the blasting foundation of an open-pit mine. Background technique [0002] In the process of open-pit mining, step drilling and blasting is usually used to strip the overlying rock layer or ore body. However, due to factors such as unreasonable explosive filling structure and unevenness of the bottom rock layer, the blasting surface of the bottom rock after blasting will be uneven. With a high chunk rate, the so-called underlying phenomenon. The roots mainly appear in the following parts: the root of the step with a relatively large resistance line of the chassis, the bottom of the step in the middle part with a large hole network parameter, the bottom of the step rock mass with insufficient blast holes and blind blasting. [0003] The reasons for the generation of large blocks and roots are mostly related to the blasting design and its...

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Problems solved by technology

[0004] The appearance of unreasonable large pieces and roots not only seriously affects the efficiency of shoveling equipment, accelerates the wear and tear of equipment, increases the workload of secondary blasting, but also affects the normal progress of other mining operations, threatening the safety of personnel and equipment

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