Method for gob-side entry retaining of medium-thickness coal seam

Abstract

The invention relates to a method for gob-side entry retaining of a medium-thickness coal seam and belongs to the technical field of gob-side entry retaining. The method is characterized in that by taking the advantage of large space of a working face of the medium-thickness coal seam, part of a support of the working face on the gob-side entry retaining side is changed into a top coal caving support and a long tail beam support, and a scraper conveyor, a transfer crusher, a transfer belt conveyor and a downward-spreading conveyor are arranged behind the supports on the working face; and in the working face propelling process, the top coal caving support is directly adopted for conveying gangue above a gob downwards, the downwards-conveyed gangue is downwards spread to the gob area on the gob-side entry retaining side to form a beside-entry support after the procedures of conveying, crushing, transferring and downward spreading, and the whole process is carried out in the gob area. Meanwhile, before the gangue is stacked, flexible protecting plates with holes are adopted for separation in advance so as to adapt to roof settling and prevent the gangue from entering an entry, cementing material filling and reinforcing are carried out, and the flexible protecting plates with the holes can be recycled. The method has important significance to guarantee of the gob-side entry retaining stability, increase of the resource recovery rate and simplifying of a beside-entry support process.

Description

technical field [0001] The invention belongs to the technical field of gob-side entry retention, and in particular relates to a gob-side entry retention that directly carries out gangue lowering, transportation, transshipment, and lowering procedures in the goaf, and utilizes the lowered gangue to be piled up as roadside support. method. Background technique [0002] The gob-side entry coal mining method has significant effects on improving the resource recovery rate, reducing the roadway excavation rate, and alleviating the tension in mining. The difficulty is generally high, and the mine pressure is also more severe. The economical and effective roadside support has always been the difficulty and key of the gob-side entry retention technology in medium-thick coal seams. In response to such problems, domestic and foreign scientific research and engineering personnel have proposed many effective related technologies, such as gangue bagging and stacking, dense pillars, and c...

AI Technical Summary

Problems solved by technology

In response to such problems, domestic and foreign scientific research and engineering personnel have proposed many effective related technologies, such as gangue bagging and stacking, dense pillars, and cementing material filling, etc., which have realized the gob-side entry retention in medium-thick coal seams to a certain extent. However, it generally costs a lot, and it is difficult to completely solve the problem of the stability of the surrounding rock of the roadway and the airtightness of the roadside support.

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