Monitoring Study on CO and Dust Diffusion in High Altitude Tunnel under Blasting Operation

In the high altitude area, the air density and the air pressure are low. CO and dust diffusion in tunnel construction have special rules. In this paper, combined with a high altitude tunnel engineering in Tibet, CO and dust diffusion during blasting operation was monitored, and diffusion situation before adopting treatment measures was compared with that after adopting treatment measures. The result shows concentration of CO and dust produced by blasting operations is high, which is more likely to cause damage to operators in areas with thin oxygen at high altitudes. Therefore, necessary treatment measures should be taken. In the longitudinal direction, the change rule of the CO and dust are totally the same. With the increase of distance from tunnel face, dust concentration declines gradually. In the range of 100m∼500m from tunnel face, the disadvantage effect of blasting is little. In this project, CO and dust concentration are reduced to a certain extent after the measures of strengthening ventilation and dust removal by water curtain are adopted.