To clarify the migration law of pollutants under the
limit distance of deadend pressin
ventilation mode in an extralong highaltitude tunnel, the Milashan tunnel is taken as the research object
to conduct migration law study on CO and dust under the limit distance of deadend pressin ventilation using the numerical
simulation software Fluent. Moreover, the site monitoring data are analyzed.
The results show the following: (1) The dust concentration on the tunneling
surface increases first and then decreases with the ventilation time. The dust
concentrates at the trolley close to tunneling face, and the dust concentration
in the trolley area varies little during ventilation. (2) The dust
concentration at the breathing surface of workers decreases step by step,
whereas the CO concentration increases linearly to the peak, and then decreases
in the form of a quadratic function. The time for CO concentration reaching the
control standard is less than dust. (3) The CO concentration in the working
area shows a quadratic function variation mode. The CO concentration lowers as
the distance from tunneling face increases, whereas the dust increases first
and then decreases to a stable value. Accordingly, the working time should be
referenced from the time for dust concentration reaching the control standard.
(4) The relationship between the dust diffusion distance and ventilation time
shows cubic function, whereas the relationship between CO diffusion distance
and ventilation time is linear.
ZHAO Shulei, WANG Haiyang, ZHAO Ningyu, GUAN Ruishi, ZHENG Shiyue, PENG Wenbin
. Migration Law of Pollutants under DeadEnd
Limit Ventilation Distance of Milashan Tunnel#br#[J]. Tunnel Construction, 2021
, 41(S2)
: 367
-374
.
DOI: 10.3973/j.issn.2096-4498.2021.S2.047
