隧道车辆排放污染物分布特性实测

为明确车辆排放污染物浓度PM_(2. 5)和挥发性有机化合物(volatile organic compounds,VOCs)]在山地城市隧道路段的分布特征,以重庆市内5条典型隧道为研究对象,采集了隧道洞内、洞口以及前后100 m范围内的空气污染物浓度值,分析PM_(2. 5)与VOCs在隧道路段的连续分布特征,以及土地开发强度与时段差异等对污染物浓度的影响。结果表明:隧道中段的污染物浓度最高、隧道出口处的污染物浓度次之、隧道进口处的污染物浓度最低;隧道高峰期间污染物浓度比平峰期间污染物浓度波动大,并且高峰期间污染物浓度大于平峰期间的污染物浓度;污染物浓度在郊区隧道路段最低,在商圈外围隧道路段居中,在商圈中心隧道路段最高; 5条隧道样本的通风效果普遍较差。建议优化隧道中段的通风装置,尤其是增加商圈中心隧道的风机密度,以改善加强隧道中段的通风效果、降低污染物浓度。。

Measurement of Distribution Characteristics of Vehicle Emission Pollutants in Tunnel

In order to clarify the distribution characteristics of vehicle emission pollutant concentration (PM2.5 and VOCs) in tunnel sections of mountainous cities, five typical tunnels in Chongqing were taken as the research objects. The concentration values of air pollutants in tunnel, tunnel portals and around 100 m were collected. The continuous distribution characteristics of PM2.5 and VOCs in tunnel sections, and the influence of land development intensity and time difference on pollutant concentration were analyzed. The results show that: the concentration of pollutants in tunnels is the highest, followed by that at the exit of tunnels and the lowest at the entrance of tunnels; the concentration of pollutants of the tunnel fluctuates greatly at rush hours than normal hours, and the concentration of pollutants at rush hours is greater than the concentration of pollutants at normal hours; the concentration of pollutants is the lowest in the suburban tunnel section, and is centered near the commercial circle, and the highest in the central section of the commercial circle; the ventilation device is beneficial to improve the ventilation conditions and reduce the pollutant concentration; the ventilation effect of five tunnels is not ideal.