秦岭终南山特长公路隧道规模庞大，通风系统复杂，为了合理确定通风配置，节约通风费用，评估自然风和交通活塞风等非机械式通风方式的通风效果就显得非常重要。课题组现场监测了终南山特长公路隧道内的自然风速、交通量及自然风压和交通风压共同作用下的风速，收集了大量数据。通过对监测数据的处理、分析得出，较大自然风速出现在10∶00—14∶00这个时间段，最大自然风速达到2.576 m/s；隧道东、西线交通量出现高峰期的时间段基本恒定；隧道东线内自然风压和交通风压共同作用下的风速较大的时间段基本上与交通量高峰期时间段相吻合，而西线这两个时间段吻合性较差，洞内风速变化相对平缓。考虑洞口外风向频率、风向、洞口实测温度等参数的自然风速计算方法计算值与实测自然风速较接近。隧道内自然风压和交通风压联合作用下的风速计算值虽小于现场实测值，但较接近实测值。

Zhongnanshan extra-long road tunnel in Qingling is large-scale and has a complex ventilation system. In order to guarantee the ventilation scheme properly and save the ventilation expenditure, the evaluation of non-mechanical ventilation effect is of importance. The research team monitored the natural wind initially, traffic flux and the wind induced by natural ventilation pressure and traffic wind force subsequently, and obtained lots of data. Through analysis of the monitoring data, we draw some conclusions: firstly, bigger speed of the natural wind occurs in the period from 10∶00 am to 14∶00 pm, and the greatest value reaches 2.576 m / s; secondly, the period of peak traffic flux in tunnel(east or west line) is mostly constant; at last, the period of bigger wind speed, which induced by natural ventilation pressure and traffic wind force, basically matches the period of peak traffic flux in the east line, while the two periods match badly in west line, meantime, the change of wind speed is relatively smooth in west line. The calculating value of the natural wind speed by method which takes account of some parameters such as wind orientation, frequency of wind orientation, the temperature of portal et al, approximates the monitoring value. The calculating value of the wind speed induced by natural ventilation pressure and traffic wind force is a little smaller than the monitoring, but approximate it.