采空区流场与瓦斯运移规律数值模拟研究

发布时间：2018-05-29 16:57

本文选题：多孔介质 + 瓦斯运移　；参考：《河北工程大学》2013年硕士论文

【摘要】：采空区瓦斯是影响煤矿安全生产的主要危险因素之一，采空区瓦斯的防治工作是煤矿安全工作的重中之重，事实证明相似材料实验和计算机数值模拟为工作面采空区瓦斯防治工作的开展提供了重要的技术手段。本文系统总结了工作面采空区流场和瓦斯运移规律国内外研究成果，研究成果表明，影响采空区流场分布和瓦斯运移的主要因素是通风条件、采空区孔隙率、来压步距等。基于此，本文采用相似材料实验和数值模拟相结合的研究方法，系统研究分析了通风风速条件、采空区孔隙率取值和来压步距对综采工作面采空区流场和瓦斯运移规律的影响。本文采用理论分析、实验室相似材料模拟、以及计算机数值模拟相结合的研究方法，利用计算流体力学、多孔介质、渗流力学等基本理论建立综采工作面采空区瓦斯渗流数学模型，利用FLUENT软件建立了综采面采空区瓦斯渗流的三维数值模型。首先对不同通风条件下孔隙率均匀分布时采空区流场和自燃“三带”分布进行了实验室相似材料模拟，然后利用FLUENT流体力学软件对不同通风风速条件、不同采空区孔隙率取值和不同来压步距情况下的采空区风流场、瓦斯运移规律以及自燃“三带”分布宽度进行了数值模拟研究，对比分析了不同能通风风速条件、不同采空区孔隙率取值和不同来压步距情况下综采工作面采空区流场与瓦斯分布规律，为正确认识采空区流场和瓦斯运移规律提供了理论依据。最后根据山西某矿0401综采工作面的具体数据资料对现实条件下的综采工作面采空区流场和瓦斯运移规律进行了数值模拟，，为0401综采工作面和其他综采工作面采空区瓦斯防治工作提供理论依据和指导意义，对煤矿安全工作面的开展和研究具有重要的指导意义，同时对深入认识综采工作面采空区风流流场和瓦斯运移分布规律也有一定的理论价值。
[Abstract]:The gas in goaf is one of the main risk factors affecting the safety of coal mine. The prevention and control of gas in goaf is the most important work in the safety of coal mine. It is proved that the experiment of similar materials and computer numerical simulation provide important technical means for gas prevention and control in goaf of working face. This paper systematically summarizes the domestic and international research results of the flow field and gas migration law in the goaf of the working face. The research results show that the main factors affecting the distribution of the flow field and the gas migration in the goaf are the ventilation condition, the porosity of the goaf, the pressure step distance and so on. Based on this, the effects of ventilation wind speed, porosity of goaf and pressure step on the flow field and gas migration in goaf of fully mechanized mining face are studied systematically by using the method of similar material experiment and numerical simulation. In this paper, theoretical analysis, simulation of similar materials in laboratory, and numerical simulation of computer are used to study, using computational fluid dynamics, porous media, The mathematical model of gas seepage in goaf of fully mechanized mining face is established by the basic theory of seepage mechanics, and the three-dimensional numerical model of gas seepage in goaf of fully mechanized mining face is established by using FLUENT software. The flow field of goaf and the distribution of "three zones" of spontaneous combustion under different ventilation conditions are simulated by similar materials in the laboratory, and then the different ventilation and wind speed conditions are simulated by FLUENT fluid mechanics software. The air flow field, gas migration law and distribution width of "three zones" of spontaneous combustion in different goaf air flow field and different pressure step distance are numerically simulated, and the conditions of different ventilation wind speed are compared and analyzed. The flow field and gas distribution law of goaf in fully mechanized mining face under the condition of different goaf porosity and different pressure step distance provide a theoretical basis for correctly understanding the flow field and gas migration law in goaf. Finally, according to the specific data of 0401 fully mechanized mining face of a certain mine in Shanxi Province, the flow field and gas migration law in goaf of fully mechanized mining face under realistic conditions are numerically simulated. It provides theoretical basis and guiding significance for gas prevention and control work in goaf of 0401 fully mechanized coal face and other fully mechanized coal mining faces, and has important guiding significance for the development and research of coal mine safety working face. At the same time, it has certain theoretical value to deeply understand the air flow field and gas migration distribution law in goaf of fully mechanized mining face.
【学位授予单位】：河北工程大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TD712

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