A method for treating the upper corner of the mining face with a large dip angle

Abstract

The invention discloses a method for treating the upper corner of a large-inclination mining working face, which adopts a gap construction method: each construction process is completed in the pressing gap of the working face; the specific construction steps are: erecting behind the end bracket Two rows of single pillars, and a number of segmental partition walls are arranged at equal intervals along the direction parallel to the roadway of the upper tunnel at the adjacent position of the upper tunnel and the goaf; several flexible airbags are respectively installed on each section of the partition wall Next to the body, close to the side of the upward groove; grouting the goaf; pre-cracking the roof at the thick and hard roof of the gob; then removing the flexible airbag and single pillar, and completing the treatment of the upper corner after the roof collapses; Cycle construction until the mining of the working face is completed. Compared with the prior art, the method of the present invention has the characteristics of simple and quick construction, low labor intensity and good safety, and is especially suitable for the upper corner of the inclined mining face with an inclination angle of 30°-45° or the steeply inclined mining face. Corner treatment.

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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