On an Establishment of the Method of Gas Drainage from the Drift Opened into a Virgin Coal Measures and its Utilization for the Enterprise Rationalization at Oshima Coal Mine

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  • 大島鉱業所における地山を主とする坑道ガス抜き法の確立とそれに伴う企業合理化について
  • オオシマ コウギョウショ ニ オケル ジヤマ オ ヌシ ト スル コウドウ ガスヌキ ホウ ノ カクリツ ト ソレニ トモナウ キギョウ ゴウリカ ニ ツイテ

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Abstract

At Oshima coal mine, the advancing method of the long wall system is adopted to mine three close successive coal seams. The amount of transudatory methane gas from surrounding coal measures to the working face of coal seam mined first was several times of other two working faces mined after about 10 and 20 months respectively. So that we were obliged to mine only one shift a day at the first mining, because the gas in gate airway became over 2.0%, even though we ventilated 1, 000m3/min of air.<BR>In order to reduce the volume of methane gas transudated to the face mined first, the method of gas drainage from the goaf has been examined since 1953. This experiment unexpectedly has shown that thereis little hope to draw out enough mine gases by this method.<BR>Therefore, I have been performing some fundamental investigations of the amount of mine gases and their pressures in virgin coal measures, and have found that about 40% of the total methane gas in coal measures is contained in these three coal seams and it can easily escape from the seams through many small cracks, which are formed by adding slight rock pressure and connect pores containing methane gas each other.<BR>This investigations have shown that the method of gas drainage from the virgin area of coal measures may not be impossible, and, moreover, that experiment has shown that this method must be established to mine the first coal seam safely.<BR>Accordingly, we have been studying on the method of gas drainage from the virgine coal measures by means of gas drainage drift opend into the rocks under the virgin coal seams, in which drift many bore holes have been drilled towards the upper virgin coal measures.<BR>It has been proofed that more than half of the total amount of methane gas in coal measures has been brought out by this method and that two or three shifts mining a day even at the first mined coal seam becomes possible as the results.<BR>The Utilization of this gas drainage method has made the concentration and reduction of the working faces and the the ventliaiton system possible, consequently the increase of mining efficiency has been attained by means of the mechanization of mine.

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