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《Railway Occupational Safety, Health & Environmental Protection》 1993-03
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Research of dynamic changing for aerosol concentration after explosion in the excavating face of tunnel

Deng Guoxiang Zhao Xuewu Sanitary Station and Anti-epidemic of the No.3 Bureau of Engineering,Minisitry of Rail way(030006)  
The relation curve between the aerosol concentration after explosion and the distance from excavating face appears in the shape of mountain peak,the peak of the curve is relatively far from excavating face and the distance of projectile smoke is approximately 130~150m. The attenuation of aerosol concentration is varied with the distance from excavating face,velocity of attenuation at the far place is faster than the near place, and the variance of attenuation velocity is unbalanced.
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