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| Distribution of Harmful Gas Concentration in Highway Tunnel with Natural Ventilation |
| ZHONG Xing-can, ZENG Zhen |
| The Second Survey and Design Institute of China Railway, Chengdu, Sichuan 610031, China |
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Abstract Research purposes: Under the condition of natural ventilation, this paper analyzes and calculates the harmful gas concentration in each subsection of tunnel.
Research methods: For the natural ventilation tunnel without vents, according to research findings of laws of airflow motion within the tunnel and engineering case, this paper calculates the harmful gas concentration in each subsection of tunnel under the normal work conditions. According to hot pressure action principle, this paper also researches the calculation method for harmful gas concentration in the tunnel under the work conditions of traffic jam.
Research results: Under the normal and jam-up work conditions, the air quality within the tunnel with natural ventilation is improved obviously.
Research conclusions: In the one-way highway traffic tunnel with vents on the roof of tunnel, the natural ventilation can control the harmful gas concentration inside the tunnel within sanitary standards.
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Received: 27 August 2006
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2006, Vol. 23 
