Deep-hole coal blasting method for steeply dipping coal seam

Abstract

The embodiment of the invention relates to the technical field of coal mining engineering, in particular to a deep-hole coal blasting method for a manless working face of a steeply dipping coal seam.The deep-hole coal blasting method comprises the steps: at the positions of solid coal walls of an upper-zone roadway and a lower-zone roadway at the depth away from a coal working face by single-timeblasting cyclical footage, a plurality of blast holes with predetermined depths are drilled obliquely inwards from the coal walls, wherein the multiple blast holes are consistent with the dip angle of the coal seam; after drilling is completed, casings are sent into drill holes within the predetermined time; according to the pre-calculated single-hole explosive load and a determined explosive loading mode, explosive coils are loaded into predetermined positions of the blast holes, explosion propagation lines are led out to be connected to an initiation point, and the blast holes are blocked through blocking gun clay; and an initiator is started, the explosive coils in the multiple blast holes are initiated simultaneously, and coal bodies at the single-time blasting cyclical footage depthare guided to move to be broken through a plurality of blasting free faces to achieve coal dropping. The deep-hole coal blasting method can be suitable for mining the steeply dipping coal seam and provides a comprehensive theory and a practical guiding basis for later production and mining of the steeply dipping coal seam.

Description

technical field [0001] The invention relates to the technical field of coal mining engineering, in particular to a method for dropping coal by deep hole blasting in a coal seam with a large dip angle. Background technique [0002] The inclination angle of coal seam is one of the factors affecting the pressure of the mine stope. The roof of the working face of the coal seam with a large inclination angle not only bears the support pressure, but also is affected by the gravity component in the direction of inclination, which is easy to damage and affect the safety of coal mining. Once a mine pressure event occurs , the equipment and personnel in the coal mining face will be seriously threatened and the losses will be relatively high. Therefore, the mining of high-inclination coal seams has always been a difficult problem in the mining field. However, since high-inclination coal seams still occupy a relatively large proportion, how to safely recover these resources has become a...

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Problems solved by technology

[0002] The inclination angle of the coal seam is one of the factors that affect the pressure of the mine stope. The roof of the working face of the coal seam with a large inclination angle not only bears the support pressure, but also is affected by the gravity component of the inclination direction, which is easier to damage and affect the safety of coal mining. Once a mine pressure event occurs , the equipment and personnel in the coal mining face will be seriously threatened and the losses will be relatively high

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