In general the nitrobenzene flux in all cross sections is more and more weak, but the attenuation trend is gradually slow down.
总体上随硝基污染物污染团的下移各断面硝基污染物通量呈减弱趋势，但是衰减趋势逐渐缓慢。
2
It is concluded from the presented results that the attenuation rate is weakly related to radius of tunnel and conductivity of tunnel wall. For a tunnel with arbitrary cross-section...