The direction of perpendicular to face advance shows J shape and the influence is bigger near the returnairway.
在垂直工作面推进方向上呈“J” 字型,且对回风巷附近气体密度影响较大;
2
Besides, the thickened pulverized fuel ash slurry is filled along with mining at the implementation goaf of a side-buried pipe of a returnairway, and has the effect of favorable leaking stoppage.
另外,增稠粉煤灰通过在回风巷侧埋管实施采空区随采随灌,增稠粉煤灰具有良好的堵漏效果。
3
If the irritation is severe enough, a sleeping person will arouse, clear the airway, then resume breathing and likely return to sleep.