摘要
为掌握分段留巷Y型通风工作面流场及瓦斯浓度在三维空间上的分布规律及采空区高瓦斯浓度区域分布范围,采用现场试验、数值分析和理论分析的方法,分别在检修班和采煤班对工作面、沿空留巷内的流场和瓦斯浓度进行了三维实测,同时借助自主研发的"一种采空区瓦斯浓度区域分布三维实测装置"对靠近留巷侧采空区瓦斯空间分布进行了三维实测和重构。研究结果表明:两进风巷道在靠近工作面煤壁交叉口拐角处风速减小而瓦斯浓度升高,工作面内高瓦斯浓度区域为靠近煤壁上方区域和与沿空留巷交叉口靠近采空区侧,沿空留巷内靠近采空区上角位置瓦斯浓度较高;近留巷侧采空区在距工作面垂直距离35~45 m和距沿空留巷垂直距离25~50 m范围内的采空区上部空间形成瓦斯集聚;工作面采用Y型通风方式时,工作面上隅角瓦斯集聚的问题能够得到很好的解决,但在靠近留巷的采空区内部一定范围内形成高瓦斯浓度区域。
In order to master the distribution of flow field and gas concentration of Y type ventilation working face in three-dimensional space and regional distribution range of high gas concentration in goaf,the flow field and gas concentration in working face and gob-side entry retaining were measured in three dimensional space respectively in maintenance class and production class based on field test,numerical analysis and theoretical analysis. Meanwhile,three dimensional measurement and reconstruction of gas distribution in the side near gob-side entry retaining were carried out by self-developed ＂three dimensional measurement device for gas concentration area distribution in goaf＂. The results show two intake airway the wind speed decreases and the gas concentration increases at the corner of the intersection of the coal wall near the working face.The area of high gas concentration in the working face is near the area above the coal wall and the intersection with the gobside entry retaining near the side of the goaf. In the gob-side entry retaining,the gas concentration in the upper corner near the goaf is high. There is a dangerous area with high gas concentration in a certain range in the goaf near the gob-side entry retaining,and the range of the high gas concentration area is the upper space of the goaf 35 - 45 m range of vertical distancefrom the working face and 25 - 50 m from the gob-side entry retaining. When the working face adopts Y ventilation mode,the problem of gas gathering on the upper corner of the working face can be well solved. However,the phenomenon of gas gathering has not disappeared,but it has been transferred to the gob area near the left lane,and has formed a high gas concentration area within a certain range.
作者
张欢
赵洪宝
李晓白
王宏冰
李兵伟
邹友平
ZHANG Huan1, ZHAO Hongbao1,2 , LI Xiaobai3, WANG Hongbing1, LI Bingwei3 ,ZOU Youping4(1. Beijing Key Laboratory for Precise Mining of Intergrown Energy and Resources, of Mining and Technology, Beijing 100083, China; 2. State Key Laboratory Cultivation Base for Gas Geology and Gas Control （ Henan Polytechnic University） , Henan Jiaozuo 454001, China; 3. Shanxi hall shih coal co. , Ltd, Changzhi Shanxi 04660, China; 4. Coal Mining ＆ Designing Department, Tiandi Science ＆ Technology Co. , Ltd. , Beijing 100013, China)
出处
《中国安全生产科学技术》
CAS
CSCD
北大核心
2018年第7期107-114,共8页
Journal of Safety Science and Technology
基金
国家自然科学基金面上项目(51474220)
河南省瓦斯地质与瓦斯治理重点实验室-省部共建国家重点实验室培育基地开放基金项目(WS2017A06)
中央高校基本科研业务费项目(2009QZ03)
大学生创新训练项目(C201501017)
关键词
分段留巷
Y型通风
采空区
三维重构
sublevel gob-side entry retaining
Y type ventilation
goal
three-dimensional reconstruction
