Research on Tunnel Ventilation System of Macao Light Rail East Line
To explore the tunnel ventilation system of the Macao Light Rail East Line,a detailed analysis and research were conducted on the feasibility study plan and relevant specifications;Based on Chinese mainland metro design experience and relevant specifications,the tunnel ventilation system during the feasibility study stage has been optimized,reducing the number of tunnel fans and piston air shafts. The ventilation section of the cross sea section has been optimized from 3 sections to 2 sections. To avoid the impact of tunnel construction on the marine environment,the middle air shaft has been canceled. By organizing ventilation reasonably,the upper air duct of the cross sea section tunnel has been optimized from double air ducts to single air ducts,The diameter of the tunnel has been optimized from 13.5m to 12.1m. The above optimized design not only meets the ventilation effect of the tunnel and the special equipment requirements in Macao,but also significantly reduces investment,the overall cost of the ventilation system for the entire tunnel has been reduced by about 46％,and the cost of the cross sea tunnel has been reduced by about 49％. In terms of construction period,the entire tunnel construction period has been shortened by 8-10 months,with the cross sea section shortened by 4-6 months. In addition,the setting of tunnel fans,fire resistance,and airflow organization under different working conditions were analyzed,providing reference for similar engineering tunnel ventilation design schemes. At the same time,a comprehensive introduction was given to the tunnel ventilation system of the Macao Light Rail East Line.
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