【作者】 柴磊；

【导师】 史宗保；

【作者基本信息】 河南理工大学 ， 采矿工程， 2010， 硕士

【摘要】 瓦斯灾害是威胁煤矿安全生产的主要自然灾害之一,预防瓦斯灾害对煤矿安全生产具有十分重要的意义,尽管国内外专家学者在煤矿瓦斯抽放方面进行了大量的研究工作,但是对于低透气性煤层瓦斯抽放的研究工作还是比较有限的。由于低透气性煤层抽放率低,研究低透气性煤层抽放参数,对于低透气性煤层提高抽放效果具有重要意义。本文主要针对低透气性煤层抽放半径确定的过程中的主要参数,分析了影响低透气性煤层抽放的几个主要因素。瓦斯压力、煤层的透气性系数对于抽放半径的影响起到关键性的作用。首先,借助瓦斯在煤层中的流动理论,对煤层瓦斯钻孔周围的瓦斯压力、瓦斯流场分布等参数进行理论分析,得到了理论上的抽放瓦斯半径。另一方面。借助FLUENT6.3软件,对抽放钻孔周围的瓦斯压力进行数值模拟,分析了不同孔径、抽放负压和不同抽放时间下的瓦斯压力分布和流场分布。最后,根据现场工业性实验的测试,得到了鹤壁中泰公司不同采区的瓦斯压力、瓦斯抽放半径、透气性系数的测试结果。通过对理论计算结果、数值模拟结算结果和现场工业性实验的测试结果分析,找出了对于低透气性煤层瓦斯抽放影响的主要参数。更多还原

【Abstract】 Gas accident is a major natural disaster which threatens the mine safty, the gas drainage has played a significant role in the mine safety. Although a great quality of research work in the gas drainage of coal mine have been carried out by the specialists at home and abroad, the research work on low permeable coal bed gas drainage still to be limited. Because the low permeable coal bed gas-drainage rate is low, studies on the low permeable coal bed gas drainage parameter, have the important meaning on enhancing the effect of gas drainage through the low permeable coal bed.The thesis focouses on determining the main parameters for low-permeability coal seam gas drainage radius, and affecting the analysis of low-permeability coal seam gas drainage of several major factors. Gas pressure, coal seam permeability plays a key role on coefficienting the impact of drainage radius. First of all, using the theory of gas in the coal seam to analyze the gas pressure, gas flow field parameters arround coal seam gas drilling in theoretical, in order to obtain the theoretical gas drainage radius. On the other hand, numerical simulating different pore size, drainage time, drainage under negative pressure and different gas pressure distribution and flow field distribution surround gas drainage borehole pressure using FLUENT6.3 software. Finally, according to industrial experiments, get the test results of gas pressures, gas drainage radius, and coefficient of permeability about different mining area of Hebi Sino-Thai Mining Co.based on theoretical calculations, numerical simulation results and industrial settlement experimental analysis of the test results to find out that low permeability coal seam gas drainage impact of the main parameters.更多还原