【摘要】 引入"污染系数"和"标准数"概念来评价城市竖井型公路隧道的自然通风潜力,分别给出正常行车工况下隧道的污染系数和阻滞工况下标准数计算方法。对南京某下穿隧道进行实例计算分析,采用三种CO浓度标准限值(10ppm、30ppm和50ppm),得出正常行车工况下四种典型车速(20km/h、40km/h、60km/h和80km/h)各段隧道污染系数以及阻滞工况下(车速≤10km/h)隧道标准数。研究表明:正常行车工况下,车速越快,污染系数越小,自然通风潜力越大;而阻滞工况下,车辆积压,散出热量大,促使CO气体从竖井排出,标准数基本满足要求。更多还原

【Abstract】 The concept of"pollution coefficient"and"criteria number"is introduced to evaluate the natural ventilation potential of highway tunnel with shafts, the calculation method of "pollution coefficient"under normal driving and"criteria number"under traffic block is proposed. Through the calculation example analysis of a tunnel in Nanjing, three CO concentration standard limit(10ppm, 30 ppm and 50ppm) are adopted, the"pollution coefficient"under four typical speed under normal driving conditions(20km/h, 40km/h, 60km/h and 80km/h) paragraphs tunnel pollution coefficient and "criteria number"under traffic block(speed of 10km/h or less) is concluded. Research shows that: under normal driving conditions, the faster the speed, the smaller the pollution coefficient, the greater the potential for natural ventilation; and under block condition, the vehicle backlog, heat generated, prompting CO gas from shaft discharge,"criteria number"basic meet the requirements.更多还原