To explore the reasons for the difference in air
demand in the ventilation standards of highway tunnels in China and abroad, and
solve the current difficulties in the precise design of highway tunnel
ventilation, the China′s tunnel ventilation design standard
of 〖WT５《TNR#I》〗Road Tunnel Ventilation Design Rules〖WT５《TNR》〗 (JTG /T D70/2022014) and the 〖WT５《TNR#I》〗Vehicle Emissions and Air Demand for Ventilation〖WT５《TNR》〗 2019 by
the WorldRoadAssociation are
taken as study objects, the calculation methods of freshair volume required for diluting pollutants of motor vehicles in
tunnels are used to calculate the freshair volume
required for the shortterm(2035) and longterm(2045) of diluting CO, NO2, and VI
under six conditions such as 80 km/h, 60 km/h, 40 km/h, 30 km/h, 20 km/h (full
block), and 10 km/h (local block), by taking the Yangtze river tunnel in
Jiangsu province, China as an example. The results reveal the following: (1) The difference in two calculation methods
results in the difference in calculation results. The design freshair volume required for diluting pollutants calculated by Chinese
standards is 3.35 times higher than that by foreign standards. The difference
of CO baseline emissions of motor vehicles in China and abroad is the reason
for the large difference in the air volume required to dilute CO, and the
impact of NO2 on the freshair
volume of tunnels has gradually exceeded that of CO. (2) The result of
calculating the freshair volume required for VI
dilution using Chinese standards shows that it is significantly affected by the
design concentration value of VI and the vehicle density under low vehicle
speed conditions. (3) With the gradual strictness of motor vehicle exhaust
emission standards and the emergence of new energy vehicles, in order to adapt
to the characteristics of motor vehicle exhaust emissions in China, the factors
to be considered in the new baseline emissions need to be increased.
WANG Yining, XIE Jingchao, XUE Peng, ZHAO Shanshan, ZHANG Guangkai, JIANG Zhenxiong, LIU Jiaping
.
Comparative Analysis of Air Demand Calculation of
Highway Tunnel between China’s
Ventilation Design Rules 2014 and Foreign PIARC 2019 Standards
[J]. Tunnel Construction, 2022
, 42(S1)
: 396
-403
.
DOI: 10.3973/j.issn.2096-4498.2022.S1.046
