回采工作面采空区瓦斯涌出规律的数值模拟研究  

Numerical simulation of gas emission in goaf of robbing working surface

作　　者：李宗翔[1] 题正义[1] 赵国忱[1] 

机构地区：[1]辽宁工程技术大学职业技术学院,辽宁阜新123000

出　　处：《中国地质灾害与防治学报》2005年第4期42-46,共5页The Chinese Journal of Geological Hazard and Control

摘　　要：从分析采空区内部的瓦斯源出发,用负指数函数描述各煤层瓦斯涌出强度的衰减过程。用迎风格式的有限元方法求解了非均质回采采空区流场的瓦斯-大气两相混溶渗流-扩散方程,以可视化技术描绘了采空区瓦斯涌出与风流交换和瓦斯分布变化规律的流体力学原理。模拟表明,采空区绝对瓦斯涌出量随工作面风量呈衰减变化。而与采空区瓦斯涌出强度呈显著地线性增加,与工作面推进度呈线性递减(但递减幅度不大);工作面风量的突然增大会对瓦斯涌出量在短时间内(8min)产生剧烈的高峰影响,用逐渐增风方法可以避免瓦斯高峰涌出的影响。提出了采空区瓦斯涌出强度的概念,论证了用瓦斯涌出强度衡量采空区瓦斯涌出的科学意义。In this paper, the attenuation process of methane emission concentration in each layer is described as negative exponential attenuation function. The equation of two-phase （methane and air） miscibility seepage-diffusion is resolved by means of upwind finite element. The fluid mechanical principle of gas emission, air exchange and the variation law of gas distribution is portrayed with the visual technique .The simulation shows that the absolute quantity of gas emission in goaf decays with the air quantity among working surface , but it increases with methane emission concentration linearly, and decreases with the advancing rate of working surface; if the input quantity of gas in goaf increases suddenly, it will have great effect on quantity of methane emission in short time （8minutes） ,that is ,the peak methane emission may be avoided by increasing air gradually.

关 键 词：非均质采空区 瓦斯涌出强度 瓦斯分布 两相混溶流 有限元 可视化技术 绝对涌出量 

分 类 号：TD712.52[矿业工程—矿井通风与安全]