摘要
实践中发现,采煤工作面高抽巷与回风巷内错距离对采场瓦斯治理效果有明显的影响,为提高高抽巷瓦斯抽采效果,对确定两者合理内错距离进行了研究。首先,基于Brinkman、N-S、平移-扩散方程和Fick扩散定理结合采场气体的流动特征,建立了采煤工作面瓦斯流动耦合模型。然后,以某矿11210工作面为例,采用COMSOL Multiphysics多物理场耦合分析软件模拟不同内错距离情况下采场瓦斯浓度及流场分布特征,并结合生产实践进行了验证。结果表明:上隅角和采空区上部平均瓦斯浓度与内错距离呈"V"型关系,当内错距离约30 m时,平均瓦斯浓度最小,瓦斯治理效果最好。数值模拟分析结果与生产实践应用结果基本一致,说明确定的内错距离较合理。
It is founded in practice that the inboard distance between mining face high drainage roadway and return air roadway has an obvious influence on stope gas controlling effect. In order to improve the gas extraction effect of high drainage roadway,determining the reasonable inboard distance was studied. First of all,based on Brinkman,N-S,pan-diffusion equation and Fick diffusion theorem,in combination with characteristics of stope gas flow,the mining face gas flow coupling model was established. Then,taking 11210 working face of a mine as an example,COMSOL Multiphysics multi-physics coupling analysis software was used to simulate stope gas concentration and flow field distribution features under different inboard distance cases,and was verified by combining with production practice. Results show that the average gas concentration in the upper corner and the upper Mined-out area and inboard distance is ＂ V＂-shaped relationship,when the inboard distance is about 30m,the average gas concentration is the lowest and the gas controlling effect is the best. The results of numerical simulation analysis and production practice application are basically consistent,which indicates that the determined inboard distance is reasonable.
出处
《贵州大学学报（自然科学版）》
2014年第2期53-56,共4页
Journal of Guizhou University:Natural Sciences
基金
国家自然科学基金资助项目(51304007)
