Dust concentration from driving aspect to blowing holeis from high to low and presents vertical distribution.Pellet in laying blowpipe section presents horizontal distribution.

• 纵向分布呈现掘进面至送风口浓度曲线由高渐低，风管铺设段呈水平分布，提示风管铺设段隧道内污染物排出顺利。