With the development of urban construction, tunnels with vertical shafts have been increasingly used in urban traffic tunnels. In this paper, steady and unsteady methods are used to simulate the airflow field of vertical-shaft type tunnels under fire conditions. The effect of vertical shaft natural ventilation opening on high temperature gas diffusion is analyzed. It is found that natural ventilation of vertical shafts introduces cold air outside the tunnel, significantly lowering the fire source temperature, to some degree reducing the damage of high temperature smoke and gases to the tunnel roof at the fire source. The introduction of fresh air also significantly lowers the concentration of toxic gases near the fire source, improving the rescue condition. The centralized discharge of toxic smoke and gases at the opening of tunnel terminal is changed to decentralized discharge at the natural ventilation opening of vertical shafts, which provides important guide for fire rescue and evacuation planning. The natural ventilation plan could meet the demand of fire escape.
SHI Xiaozeng
,
WU Jiazheng
. Numerical Simulation of Fire Ventilation in City Tunnels with Vertical Shafts[J]. Science & Technology Review, 2014
, 32(25)
: 63
-69
.
DOI: 10.3981/j.issn.1000-7857.2014.25.011
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