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VARIATION LAW OF QUANITY OF COAL DUST IN DRILL HOLE AND ITS APPLICATION TO DETERMINATION OF REASONABLE WIDTH OF
COAL PILLARS |
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Abstract The relationship between variation law of quanity of coal dust in drill hole and distribution of abutment pressure is researched，and it is demonstrated that the distribution regulation of abutment pressure and support time of mining face can be calculated according to the quanity of coal dust in drill hole. Accordingly，the distribution of abutment pressure on the block coal pillar is measured at working face with a steeply inclined seam of the12010 face，NO.13 coalmine of Pingtingshan Coal Mine Group，which provides a basic data for persevering reasonable width of coal pillar.
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Received: 14 October 2002
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LI Botao1, 2, 3, TAN Yuxuan1, LIN Haifei4, 5*, WEI Jianping1, 2, 3, ZHANG Hongtu1, 2, 3, LI Shugang4, 5, WEI Zongyong4, 5, WANG Pei4, LUO Rongwei4, LIU Yanwei1, 2, 3. Mechanical properties and mesoscopic damage evolution of coal under liquid-nitrogen freezing at different initial temperatures[J]. , 2026, 45(6): 1757-1772. |
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