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In order to accurately see about effective radius of surface drillings draining pressure relief gas of coal seam,Abstract: In gas prediction and prevention , it is important for the Mine-managers to know coal-seam gaspressure.gain reasonable parameters of the layout of ground drillings, guide scientifically and effectively gas prevention work ofAbstract: In gas prediction and prevention , it is important for the Mine-managers to know coal-seam gaspressure.mining coal, this paper first of all discusses the principle of surface drillings draining pressure relief gas of coal seam.Abstract: In gas prediction and prevention , it is important for the Mine-managers to know coal-seam gaspressure.This paper basing on the theory of gas storage and flow in coal seam, the theory of exploitation of protecting coal seam,Abstract: In gas prediction and prevention , it is important for the Mine-managers to know coal-seam gaspressure.using industrial-type test and two-tracer technique, in-depth study effective radius of surface drillings draining pressureAbstract: In gas prediction and prevention , it is important for the Mine-managers to know coal-seam gaspressure.relief gas of coal seam along the orientation and the direction. The results showed that: effective radius of groundAbstract: In gas prediction and prevention , it is important for the Mine-managers to know coal-seam gaspressure.drillings draining pressure relief gas along the orientation not less than 160m and not less than 240m along theAbstract: In gas prediction and prevention , it is important for the Mine-managers to know coal-seam gaspressure.direction.

KEYWORDS

Surface drilling; relief gas; effective radius

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Autor: Shuchuan Zhang

Fuente: http://www.scirp.org/



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