The law of gas distribution in goaf of fully mechanized top-coal caving working face with ＂double-U＂ ventilation system
Abstract：Gas in the goaf of fully mechanized top-coal caving working face 5303 with ＂double-U＂ ventilation system was sampled regularly by mining moveable beam tube sampling system and analyzed by the chromatographic analysis system.As the working face advanced,the tracer gas was released in stages to measure the velocity field of gas in the goaf.Then CFD simulation technology was employed for the numerical simulation of gas distribution in the goaf.The results indicate that the high-concentration gas in the deep part of goaf concentrate gradually along the return-air side to become a gas abundance zone,where the maximum gas concentration is up to 70% under the normal production condition.The gas distribution law in the goaf of fully mechanized top-coal caving working face with ＂double-U＂ ventilation system attained by CFD simulation technology goes well with the results from in-situ measuring,suggesting that CFD simulation could provide a scientific basis for gas drainage strategies.
Keywords：double-U ventilation systemfully mechanized top coal caving mininggoaflaw of gas distributionCFD simulation
Publication Date：2011-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)