为探究国内外公路隧道通风标准中需风量存在差异的原因，解决目前公路隧道通风精准化设计存在的难题，以我国隧道通风设计标准JTG/T D70/2-02—2014《公路隧道通风设计细则》和世界道路协会（PIARC）《Road tunnels : Vehicle emissions and
air demand for ventilation》2019标准中关于隧道稀释机动车污染物所需风量计算方法为理论基础，结合江苏省某长江隧道实际工程案例，针对80、60、40、30、20（全程阻滞）、10 km/h（局部阻滞）6种工况，分别计算稀释CO、NO2和VI的近期（2035年）、远期（2045年）所需风量。结果表明： 1）两者在计算方法上的不同造成了计算结果的差异，相同背景计算出的稀释污染物设计需风量数值国内标准是国际标准的3.35倍； 国内外机动车CO基准排放量的差异是造成稀释CO所需风量差距较大的原因，且NO2对隧道需风量的影响程度已逐渐超过CO。2）采用国内标准计算稀释VI所需风量值在低车速工况下受烟尘设计浓度值和车密度影响较明显。3）随着机动车尾气排放标准逐渐严格和新能源汽车的出现，为了适应我国机动车尾气排放特性，新的基准排放量要考虑的因素需增加。
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.
