【作者】 姚春雨；

【导师】 郝天轩；

【作者基本信息】 河南理工大学 ， 矿业工程， 2010， 硕士

【摘要】 随着科技的进步,大多高产矿井使用综合机械化采煤方法。该方法效率高、推进速度快,但其开采强度大,采空区遗煤多、空间也大、围岩破坏程度严重,使得采空区涌向工作面的瓦斯急剧上升,工作面回风巷和上隅角瓦斯频频超限。掌握综采工作面采空区瓦斯流动规律并对采空区实施抽放措施是降低工作面瓦斯涌出量和上隅角超限的主要手段。研究采空区瓦斯流动规律对煤矿安全生产十分必要。本文系统总结了采空区瓦斯运移规律及数值模拟研究成果。根据前人研究成果和黄陵二号煤矿107综采工作面采空区瓦斯抽放的现状提出考虑非等高拱形冒落的采空区三维多孔介质模型并用Fluent对其进行数值模拟。在研究过程中首先通过流体力学、瓦斯渗流力学和多孔介质流体力学等理论建立了综采工作面采空区瓦斯渗流的数学方程。其次,通过现场考察107综采工作面高位裂隙钻孔的单孔瓦斯抽放情况,得到采空区上覆岩石裂隙带和冒落带的高度,尤其是得出了冒落带非等高冒落的具体情况为建立采空区三维模型提供了依据。然后,本文通过Fluent模拟采空区瓦流动规律得到结论为:回风侧瓦斯浓度较高,在回风侧冒落带拱形冒落弧线区有大量高浓度瓦斯聚集,其瓦斯浓度可达到7%,这个区域大致在距回风侧5-30m,高度为12-25m。最后,利用模拟得到的采空区瓦斯流动规律优化了107综采工作面高位裂隙钻孔的参数,并为以后的采空区瓦斯抽放提供了依据。更多还原

【Abstract】 With the development of science and technology, most productive use of integrated mechanized mining methods mine. This method is efficient, fast forward, but its exploitation of strength, residual coal mined-out area and more space large rock mass gravity, and also serious damage of surrounding rock, making gob area flock to face a sharp rise in gas, face return air Lane and the upper corner gas frequently overrun. So master Workface Gob gas flow pattern and the implementation of drainage measures in mined-out area is to reduce the face amount of gas emission and the upper corner of the primary means of transfinite. Study on the gas flow law in gob is necessary for coal mine safety.This paper systematically summarizes the gob gas migration law and numerical simulation research. According to previous research results and the Gas Drainage status of 107 workface gob on Huangling NO.2 mine that it will consider the non-high-arched gob caving in three-dimensional porous medium model and use numerical simulation of Fluent. In the course of the study, first through the fluid, gas seepage mechanics and the theories of fluid mechanics in porous media has established Workface Gob mathematical model of gas seepage. Secondly, through on-site visits 107 workface high gas drainage hole drilling conditions to be mined-out area of overlying rock fractures zone and the height of caving zone, especially come to caving zone of non-specific high-risk fall conditions for the establishment of gob area provide a basis for three-dimensional model. Then, this paper Fluent simulation of flow pattern tile gob area to be concluded as follows: return air side of high gas concentration in the return air side of caving arch arcs area with a large number of high concentrations of gas gathering, the gas concentration can be achieved 7%, roughly the region away from the return air side of 5-30m, a height of 12-25m. Finally, using simulated by the law of gob gas flow optimizes the high fracture drilling parameters in 107 workface, and for subsequent gob drainage was provided.更多还原