Upper corner treatment method for large-dip-angle mining work face

Abstract

The invention discloses an upper corner treatment method for a large-dip-angle mining work face. An interval construction method is adopted, that is, each time of construction is completed in the weighting interval of the work face. Specifically, two rows of single supporting pillars are erected at the back of an end supporting frame, and a plurality of segmented isolation walls are arranged at the adjoining position of an upper gate road and a goaf in the direction parallel to an upper gate road roadway at equal intervals; a plurality of flexible air bags are installed beside the segmented isolation walls correspondingly and near the side of the upper gate road; the goaf is grouted; roof pre-splitting is carried out at a side thick hard roof of the goaf; the flexible air bags and the single supporting pillars are detached, and upper corner treatment is completed after the roof is collapsed; and construction is conducted circularly until mining of the work face is completed. Compared with the prior art, the upper corner treatment method for the large-dip-angle mining work face has the characteristics of being easy, convenient and fast to construct, low in labor intensity, good in safety and the like, and is particularly suitable for upper corner treatment of an inclined mining work face with the inclination angle of 30-45 degrees or a steeply inclined mining working face.

Description

technical field [0001] The invention relates to a method for treating the upper corner of a large-inclination mining working face, which is particularly suitable for the comprehensive prevention and control of the upper corner of a fully-mechanized caving working face with a coal seam inclination greater than 30°, a coal seam with a short natural ignition period, and a thick, hard roof. Safety production technology field. Background technique [0002] Due to poor ventilation and high temperature and humidity in the upper corner area, it is easy to accumulate the gas released at the intersection of the goaf and the mining face, resulting in a high gas concentration. It is a key area for gas prevention and control in the coal mining face. [0003] The coal seam with large dip angle or steep dip is a relatively complex and special coal seam occurrence form, and its mining technology and method are very different from those of horizontal and inclined coal seams. The mining of n...

AI Technical Summary

Problems solved by technology

[0005] However, due to the special structure of the steeply inclined working face, the upper corner position space of the working face is much larger than that of the ordinary inclined or gently inclined working face, and it goes deep into the gob to form a large suspended roof space. The gobs are connected in one piece, and there is a huge space for air leakage in the gobs because they have not been compacted by caving. Coal residues in the goafs have the risk of spontaneous combustion, and the eddy currents at the upper corners of the gobs are likely to cause abnormal gas gushing

Since most of this part of space is located inside the goaf, and as the mining of the working face continues to expand, the method proposed in this patent is not only time-consuming and laborious to construct, but also difficult to recover the air bag, which only plays the role of blocking gas, but cannot Effective fire retardant, pre-cracking and other treatments are carried out at the position of the goaf

[0006] In addition, the flexible airbag of the above-mentioned technical solution is fixed on the single pillar, which is troublesome to disassemble and assemble, and requires the operator to work beside the single pillar for a long time

That is to say, it is necessary to keep people on duty for a long time in the goaf, and there is a great potential safety hazard

[0007] In summary, the above-mentioned technical solutions cannot be applied to the treatment of the upper corner position of the large-inclination / steeply-inclined working face

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