Research on Pressure Relief and Effect Inspection of Upper Protection Layer Mining
Keywords:Coal and gas outburst, Upper protective layer mining, Pressure relief, Danger.
Mining protective layers is an effective measure to prevent coal and gas outburst. Taking the mining of the upper protective layer of the Wulan coal mine as the research object, theoretical analysis was conducted to calculate the protection range after the mining of the protective layer and the impact range of the coal pillars left in the protective layer. On site inspection was conducted to analyze the outstanding danger of the protected layer. The research results indicate that the mining of the protective layer on the Wulan coal mine has a certain pressure relief effect on the protected layer. The maximum residual gas content of the protected layer in the protected area is 5.21 m3/t, and the maximum gas content of the protected layer in the coal pillar influence area is 6.11 m3/t. The mining area of the protected layer working face is already an area without outburst risk.
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