采空区瓦斯涌出动态变化规律数值模拟  

Numerical simulation of dynamic variation law of gas emission from goaf

作　　者：赵林 董子文[2] 杨子剑 邹治 孟丽萍 柳劲甫 ZHAO Lin;DONG Ziwen;YANG Zijian;ZOU Zhi;MENG Liping;LIU Jinfu(Inner Mongolia Pingzhuang Energy Co. ,Ltd. ,Chifeng 024076,China;School of Safety and Environment Engineering,Hunan Institute of Technology,Hengyang 421002,China)

机构地区：[1]内蒙古平庄能源股份有限公司,内蒙古赤峰024076 [2]湖南工学院安全与环境学院,湖南衡阳421002

出　　处：《陕西煤炭》2021年第3期5-10,共6页Shaanxi Coal

基　　金：国家自然科学基金资助(51804107);湖南省自然科学基金资助(2020JJ4260);湖南省大学生创新创业项目(S202011528038)。

摘　　要：为明确综采工作面采空区瓦斯涌出受风量、推进速度等的影响规律,采用数值仿真的方法,研究采空区瓦斯在不同风量与推进速度下随开采时间的动态变化。结果表明,采空区瓦斯涌出以扩散和对流为主,漏风流对采空区瓦斯涌出具有促进和抑制2种作用,即诱导、携带的促进作用与抑制作用;一般风量增加、漏风加剧,采空区瓦斯涌出量增加,当采空区瓦斯主要来源于风压低的深部采空区与部分裂隙发育区域时则具有抑制作用。开采期间,推进速度大小对瓦斯涌出量大小也具有2种影响规律。在瓦斯涌出达到最大值前,推进速度大,瓦斯涌出量大;瓦斯涌出量至最大值后,推进速度快其瓦斯涌出量低。瓦斯涌出量达到最大值所需时间随供风速度增加而增加,随推进速度增加而降低。In order to determine the influence law of air volume and mining velocity on the gas emission from goaf,by using the numerical simulation method,the dynamic variation rule of gas emission from goaf with mining time under different air volume and mining velocity is studied.The results show that the gas emission from goaf is dominated by diffusion and convection,and the air leakage flow has two functions of promoting and restraining the gas emission in goaf.When air volume increases,air leakage intensifies,and gas emission from goaf increases generally.When the goaf gas mainly comes from deep goaf and fissure zone with low wind pressure,the inhibition effect is obvious.During mining,there are two kinds influence laws of the mining velocity on the amount of gas emission from goaf.Before the gas emission reaches the maximum,the gas emission increases with the increase of mining speed.When the gas emission reaches the maximum,the faster the mining speed,the lower the gas emission.The time for gas emission to reach the maximum value increases with the increase of wind speed and decreases with the increase of mining speed.

关 键 词：采空区 瓦斯涌出 风量 推进速度 数值模拟 

分 类 号：TD712[矿业工程—矿井通风与安全]