错层位巷道布置采空区孔隙率模型及瓦斯流场分布规律研究  

Numerical simulation of goaf porosity with staggered roadway layout and distribution law of gas flow field

作　　者：王志强[1,2] 林陆 李敬凯 李廷照 黄阳 马一多 赵威 WANG Zhiqiang;LIN Lu;LI Jingkai;LI Tingzhao;HUANG Yang;MA Yiduo;ZHAO Wei(School of Energy and Mining Engineering,China University of Mining&Technology(Beijing),Beijing 100083,China;China-Russia Dynamics Research Center,China University of Mining&Technology(Beijing),Beijing 100083,China)

机构地区：[1]中国矿业大学(北京)能源与矿业学院,北京100083 [2]中国矿业大学(北京)中俄动力学研究中心,北京100083

出　　处：《西安科技大学学报》2023年第5期845-853,共9页Journal of Xi’an University of Science and Technology

基　　金：国家自然科学基金项目(52074291,51774289);西部煤炭绿色安全开发国家重点实验室开放基金项目(SKLCRKF1903)。

摘　　要：采空区孔隙率分布对采空区气体流动具有重要影响。为研究错层位采空区孔隙率对瓦斯流动规律的影响,以镇城底矿22202错层位巷道布置工作面为工程背景,通过理论研究推导错层位采空区孔隙率分布的数学模型,建立错层位采空区孔隙率分布三维空间函数,分析错层位巷道布置形式对采空区孔隙率分布的影响;运用FLUENT模拟揭示了错层位与传统巷道布置工作面及采空区浅部区域瓦斯运移变化规律;通过现场实践,进行瓦斯浓度的监测。结果表明:相较于传统工作面,错层位采空区孔隙率呈现“一高一低”不对称U形分布特征,巷道布置差异对采空区整体瓦斯分布影响较小,但对工作面及回风侧采空区浅部流场有较大影响;其次错层位工作面存在的起坡段,增加了采空区漏风风阻,减少了采空区漏风量,提高了工作面通风效率且回风巷位于煤层顶板利于瓦斯排放,可有效解决工作面上隅角瓦斯超限问题。错层位巷道布置能有效降低工作面瓦斯积聚浓度,可充分保障工作面安全高效生产。The distribution of porosity fraction in goaf has an important influence on the fluid flow in goaf.In order to explore the impact of porosity on the fluid flow pattern in staggered roadway layout goaf,the 22202 staggered roadway layout working face in Zhenchengdi Mine is taken as the engineering background.In this paper,the mathematical model of porosity distribution in goaf with staggered roadway layout was deduced through theoretical analysis,the three-dimensional space function of porosity distribution in goaf with staggered roadway layout was established,and the influence of porosity in goaf with staggered roadway layout was examined.FLUENT numerical simulation was revealed the variation law of gas migration in staggered and traditional roadway layout working faces and shallow areas of goaf.Throuth the field practice,the gas concentration is monitored.The results showed that compared with the traditional roadway layout working face,the porosity of staggered roadway layout goaf presented a U-shaped distribution characteristics of“one high and one low”,and the difference in roadway layout had little influence on the overall gas distribution in the goaf,but had a great influence on the shallow flow field of the working face and the return airway side goaf.The slope section of the staggered working face increases the air leakage in the goaf,reduces the air volume of the air leakage in the goaf,improves the ventilation efficiency of the working face and the return air lane is located on the roof of the coal seam,which is conducive to gas emission and able to solve the problem of gas overrun in the upper corner of the working face effectively.The staggered roadway layout can efficiently reduce the gas accumulation in the working face,which is beneficial to fully guarantee a safe and efficient production of working face.

关 键 词：错层位巷道布置 采空区 孔隙率 瓦斯分布 

分 类 号：TD712[矿业工程—矿井通风与安全]