中文摘要：

通过在鹰嘴岩隧道内的现场模拟火灾试验，对不同纵向通风速率下隧道内烟气发展过程进行了研究。结果表明，纵向风速和火源大小均对烟气层沉降有重要影响。相比之下，纵向风速对烟气层沉降的影响更大；火源位置较高时，烟气层热膨胀力较大，在距离火源一定距离外仍可产生上游方向的烟气逆流；一定坡度的隧道在某种条件下可以产生“弱烟囱效应”，导致烟气向下游方向的流速增加。在隧道设计中可以考虑利用这一点来增加排烟效率。

英文摘要：

Full-scale fire experiments were conducted in the Yingzuiyan Tunnel and the development of smoke layer were measured under different longitudinal wind speed conditions. Results showed that the different longitudinal wind speed and fire size would influence the smoke layer falls deeply. Comparing the two factors, longitudinal wind speed takes more important role. When fire source locates at high position, the expansibility of smoke layer is en- larged and adverse smoke flow happens outside of a certain distance from fire source. A slight stack effect is pro- duced in some gradient of tunnel, which conducts the flow to backward position is accelerated. This character could be introduced to improve the effect of smoke extract during tunnel design process.