Control method for fully mechanized caving mining stability of large dip angle working face

Abstract

The invention provides a control method for fully mechanized caving mining stability of a large dip angle working face. The method comprises layout of the large dip angle working face, a stability control method of a working face support, a stability control method of a working face coal wall and a safety protection method of fully mechanized caving mining. The working face is in bow pseudo-inclined layout, and can effectively inhibits coal wall rib spalling of the large dip angle working face; coal cut by a coal cutter moves to the coal wall side, and the flying coal risk of a miner working in the walkway is eliminated; and the control method is reasonable in design, technically simple and convenient to construct, with the adoption of the stability control method of the working face coalwall and the safety protection method of the fully mechanized caving mining, stability of the working face coal wall can be improved, the safety problem of workers in a coal mining process is effectively guaranteed, the probability of occurrence of safety accidents is reduced, and safe and efficient production of the working face is realized. The coal caving efficiency of the fully mechanized caving face and the coal recovery rate are increased, and the dilution rate is reduced; and the cycle yield of the fully mechanized caving face is greatly increased.

Description

technical field [0001] The invention relates to the technical field of underground coal mining, in particular to a method for controlling the stability of fully mechanized caving mining in a large-inclination working face. Background technique [0002] The high-dip coal seam is a part of the inclined and steep coal seam, which is a kind of coal seam with special burial conditions and a difficult-to-mining coal seam recognized by the international mining community. The variable-angle fully-mechanized caving mining face with large dipping angle coal seam is affected by the change of coal seam dip angle and working face angle, and the deformation and failure of coal wall in different areas of the working face, the stress distribution and the relationship between supports are complicated, which cannot guarantee safe and efficient mining. After the excavation of the fully mechanized caving face with large inclination, one side of the coal wall is a free area, and the coal wall is...

AI Technical Summary

Problems solved by technology

On the one hand, due to the existence of the coal seam, the pressure of the support on the working face is relatively small, but at the same time, its reaction force on the roof is also reduced, resulting in poor roof cutting effect on the roof, and the roof is not easy to collapse. When the roof is not very hard, the above The problem is not very prominent, but if the roof is hard, measures must be taken to ensure that the roof collapses in time; on the other hand, because the coal seam bears the pressure of the roof, it becomes more broken. Empty, there is a phenomenon of empty brackets, causing safety hazards

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