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为深入研究顶板巷瓦斯抽采量对漏风流场的扰动效应,以河南义马耿村煤矿13190工作面实际情况为例,通过数值模拟与实测相结合的方法分析瓦斯抽采诱导漏风规律。首先,对现场实际工况下的漏风流场进行数值模拟及分析;其次,根据示踪气体实测结果,验证了模拟的有效性;最后,分析不同抽采量下工作面的漏风分布情况。研究结果表明:漏风风流进入采空区后呈现立体迁移和“一源两汇”的分布特征;随着顶板巷抽采量的增加,工作面向采空区的漏风区域逐渐向回风巷方向扩展,最低风量点位置向回风巷方向移动,采空区气体向工作面的涌出效应逐渐减弱,工作面向采空区的漏风量逐渐加大。
In order to further study the disturbing effect of gas drainage on leakage flow field in roof slab, taking the actual situation of 13190 working face in Gengcun Coal Mine, Yima, Henan as an example, the law of inducing air leakage induced by gas drainage is analyzed by numerical simulation and actual measurement. Firstly, the numerical simulation and analysis of the air leakage flow field under the actual working conditions are carried out. Secondly, the validity of the simulation is verified by the measured results of the tracer gas. Finally, the air leakage distribution of the working face under different pumping rates is analyzed. The results show that the leaking air flow enters into the gob and presents three-dimensional migration and distribution characteristics of “one source and two sinks”. With the increase of roof extraction, the air leakage area in the working area faces the return air lane In the direction of expansion, the position of the lowest air volume point moves toward the air return lane, and the gushing effect of the gob gas to the working face gradually diminishes, and the air leakage of the working face to the goaf gradually increases.