摘要
以综采工作面采空区为研究对象,基于渗流理论及连续性方程,运用三维数值模拟的方法,以Y型通风为例,采用上隅角埋管、预埋立管和高位定向钻孔协同抽采,研究抽采前后采空区在走向、倾向和竖直方向上瓦斯流场分布规律,并通过对比文献中的试验数据来验证数值模拟结果的可靠性。结果表明:抽采前,Y型通风下在综采工作面采空区走向上,距离工作面越远深部瓦斯浓度越高,瓦斯最高体积分数为98.6%,综采工作面采空区倾向上瓦斯浓度较小,瓦斯浓度在1.0%以下;抽采后,综采工作面采空区瓦斯最高体积分数由98.6%降低至4.6%,且采空区3/4区域瓦斯体积分数不足3.0%,综采工作面与上隅角区域瓦斯体积分数也均降低至1.0%以下,未产生上隅角区域瓦斯浓度超限现象,瓦斯浓度大幅度下降。该研究对丰富采空区瓦斯渗流理论、提高瓦斯抽采量、解决上隅角区域瓦斯浓度超限问题、保证矿井安全生产等方面具有一定的理论和现实意义。
Taking the goaf of fully mechanized mining face as the research object,on the basis of the seepage theory and continuity equation,using the method of three-dimensional numerical simulation,taking Y-type ventilation as an example,using the upper corner buried pipe,pre-buried riser and high-level directional drilling collaborative drainage,the distribution of gas flow field in the strike,tendency and vertical direction of the goaf before and after drainage was studied,and the experimental data in the literature to verify the reliability of the numerical simulation results were compared.The results show that before drainage,under Y-type ventilation,the farther away from the working face,the higher the gas concentration in the deep part of the goaf in the fully mechanized mining face,and the highest gas volume decentralization is 98.6%.The gas concentration in the goaf tendency of the fully mechanized mining face is small,and the gas concentration is below 1.0%;the maximum volume decentralization of gas in the goaf of the fully mechanized mining face is reduced from 98.6%to 4.6%,and the gas volume fraction in the 3/4 area of the goaf is less than 3.0%after extraction.The gas volume fraction in the fully mechanized mining face and the upper corner area is also reduced to less than 1.0%.There is no gas concentration overrun in the upper corner area,and the gas concentration greatly decreases.The research has certain theoretical and practical significance for enriching the theory of gas seepage in goaf,improving the amount of gas drainage,solving the problem of gas concentration exceeding the limit in the upper corner area,and ensuring the safety of mine production.
作者
丁厚成
秦浩
邓权龙
冯俊军
章成浩
DING Houcheng;QIN Hao;DENG Quanlong;FENG Junjun;ZHANG Chenghao(School of Civil Engineering and Architecture,Anhui University of Technology,Maanshan 243032,China)
出处
《安全与环境工程》
CAS
CSCD
北大核心
2023年第6期146-153,共8页
Safety and Environmental Engineering
基金
安徽省自然科学基金项目(1808085ME161)。
关键词
采空区
协同抽采
Y型通风
综采工作面
瓦斯分布
数值模拟
goaf
collaborative drainage
Y-type ventilation
fully mechanized mining face
gas distribution
numerical simulation
