综放面走向高抽巷参数的确定与数值模拟实验

发布时间：2018-04-11 18:05

本文选题：走向高抽巷 + CFD　；参考：《太原理工大学》2013年硕士论文

【摘要】：综放面瓦斯涌出的一个重要来源是采空区瓦斯涌出,且瓦斯抽采已经被证明是保障煤矿安全生产的重要技术手段。大量研究表明,对综放面采空区及其上覆岩层内的瓦斯渗流规律的研究是合理高效地瓦斯抽采设计的理论基础。基于此,结合井下实际情况和FLUENT软件数值试验,确定了采场中高抽巷走向位置,使其瓦斯抽采达到最佳效果。本文总结了煤矿采空区瓦斯渗流规律的研究成果和最新进展,研究了气体在采空区的流动方程。确定采空纵向“三带”(冒落带、裂隙带、弯曲下沉带)需要根据覆岩岩层移动规律以及相应的计算机模拟,正确合理的高抽巷距离底板高度会直接影响模拟的结果。研究了多空介质的概念,将井下气体看成不可压缩流体,研究其在多孔介质中的流动。本文运用了Fluent数值模拟结合张家庄矿现场监测实验,得出了走向高抽巷的具体位置参数,在竖直距离22m与距回风巷水平距离16m,高抽巷的抽放效果达到最佳,高抽巷的抽放瓦斯达到了30%,综放面上隅角的瓦斯浓度符合《煤矿安全规程》的规定即瓦斯浓度小于1%,煤矿井下可以进行安全、高效地生产。参照模拟的参数可以在相似条件的矿井进行推广,具有较高的经济效益。
[Abstract]:An important source of gas emission from fully mechanized caving face is gas emission from goaf, and gas drainage has been proved to be an important technical means to ensure the safety of coal mine production.A large number of studies show that the study on the law of gas seepage in goaf of fully mechanized caving face and its overlying strata is the theoretical basis for the design of rational and efficient gas drainage.Based on this, combined with the actual situation of underground and the numerical test of FLUENT software, the strike position of high drainage roadway in the stope is determined, so that the best effect of gas drainage is achieved.In this paper, the research results and recent progress of gas seepage in goaf are summarized, and the flow equation of gas in goaf is studied.It is necessary to determine the vertical "three zones" (caving zone, fissure zone, bending subsidence zone) of the mining goaf according to the law of strata movement of overburden rock and the corresponding computer simulation. The correct and reasonable height of the bottom slab from the extraction roadway will directly affect the result of the simulation.The concept of multivoid medium is studied. The underground gas is regarded as an incompressible fluid and its flow in porous media is studied.In this paper, Fluent numerical simulation combined with field monitoring experiment in Zhangjiazhuang Mine is used to obtain the specific location parameters of high pumping roadway. The pumping effect of high pumping roadway is the best when the vertical distance is 22m and the horizontal distance from the return air lane is 16m.The gas concentration in the upper corner of top corner of fully mechanized caving face accords with the regulation of coal mine safety regulation, that is, the gas concentration is less than 1, and the underground coal mine can be safely and efficiently produced.The simulation parameters can be popularized in mines with similar conditions and have high economic benefit.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TD712.6

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