When digging in the roadway, the purpose of ventilation on the working surface is two. One is to discharge the gun smoke and a large amount of dust generated by the blasting in a short time. In order to facilitate the loading of rock work; the second is to supply fresh air to the working face, discharge dust and dirty air generated by rock drilling and rock loading, reduce the working surface temperature and create a better working environment. Since the tunneling is a single-head construction, it is difficult to form a through-flow. Therefore, the local fan is generally used for ventilation. The ventilation time after blasting is generally not less than 40 minutes, and the personnel can enter the working surface for rock loading.
The tunnel ventilation mode can be divided into three types: press-in type, draw-out type and hybrid type, among which the mixed ventilation effect is the best.
The tunnel ventilation mode can be divided into three types: press-in type, draw-out type and hybrid type, among which the mixed ventilation effect is the best.
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