Bottom coal recovery method of gob-side roadway in thick coal seam based on slug effect of narrow coal pillar

Abstract

The invention provides a method for recovering bottom coal from a roadway along gob in a thick coal seam based on a narrow coal pillar swelling effect. According to the method, determination of reasonable width of a narrow coal pillar of the roadway along gob in the thick coal seam and recovery of the bottom coal are taken into consideration, and comprehensively designed, measures are taken actively, the efficacy that the narrow coal pillar can make a roadway bottom plate to generate serous bottom swelling is sufficiently utilized, the narrow coal pillar with a reasonable width is determined and reserved through theoretical calculation and so that the bottom coal in the roadway can be broken and swell, a mining excavating type loader is selected to dig and load the bottom coal in a loose state to a scraper conveyer of the loader, and the bottom coal is conveyed to a belt type conveyer to be transported out through a reshipping type conveyer. On the one hand, the method overcomes the defects that traditionally manual bottom mining is forced when bottom coal roadway along gob generates serious bottom swelling, the mechanization level is low, and the labor intensity of workers is high, passiveness is changed into activeness, mechanization is completely achieved in all bottom coal recovery procedures, and thus the working efficiency is improved greatly; and on the other hand, the double measures of narrow coal pillar arrangement and bottom coal recovery are taken, and accordingly the purpose of improving the coal source recovery rate is achieved.

Description

technical field [0001] The invention relates to a method for recovering bottom coal in gob-side roadway with thick coal seam and narrow coal pillar, in particular to a method for efficiently recovering bottom coal in goaf-side roadway with thick coal seam and narrow coal pillar based on the effect of narrow coal pillar. Background technique [0002] In thick coal seam mining, since the height of the mining roadway in the working face is smaller than the thickness of the coal seam, the mining roadway along the goaf is used to excavate the roadway along the top and leave the bottom coal in order to avoid roof fall accidents due to the top coal remaining. Because the floor of this kind of roadway is a coal body with low strength and is in an open state without support, under the combined action of the side bearing pressure of the adjacent goaf and the leading bearing pressure of the working face, serious bottoming will occur. In order to prevent serious bottoming of this kind o...

AI Technical Summary

Problems solved by technology

At the same time, because the bottom is only lifted manually when the bottom is serious, the level of mechanization is low, the labor intensity of the workers is high, and the bottoming efficiency is low, which seriously restricts the advancing speed of the mining face.

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