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AssigneeTatabanyai Szenbanyak
InventorsKaroly Barsi, Hugo Salamon, Andras Solymos, Jozsef Takacs, Istvan Toth
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There is disclosed a process for the extraction of thick coal seams by means of which coal seams not extractable in one bank or slice and/or located at peripheral areas may also be extracted under improved mine safety conditions and with high productivity. According to the invention the thick coal seam is if required, divided horizontally and/or vertically into extraction blocks which are bounded and separated by stowing pillars arranged according to the direction of advance of the extraction. The cavity of the pillars is advanced at a level higher than the level of the roof of the extraction space, after which the cavity of the pillar is back-filled. Then the block is extracted by means of block caving in a manner known per se. In a preferred embodiment of the invention incombustible material that agglomerates under the effect of the static pressure of the rock is used for stowing. The utilization of the process for extraction according to the invention results in a considerable increase of intensity. Whether the extraction is in one or more slices and whether using individual or self-advancing supports, using track-bound or independent loading/conveyor equipment, an economic extraction of coal seams is achieved.
A process for the extraction of thick coal seams which are divided into extraction blocks, horizontally and/or vertically, comprising bounding each of the extraction blocks by a stowing pillar so no air circulates between the extraction blocks, said pillars being interspaced at a distance wherein stress zones created thereby are in contact with one another, and said pillars are set up according to the direction of advance of extraction by advancing the cavity of the stowing pillar having a roof level within the coal seam which is higher than the level of the roof of the extraction space which is formed at the bottom of the extraction block, backfilling the cavity and then extracting the block by block caving.
Dependencies are inferred from the claim text.