Study on fire temperature field and CO distribution law of concave pipe gallery cable cabin in inverted rainbow section
This paper is motivated by the need to guide the structural design of cable compartments in underground comprehensive utility tunnels and fire evacuation within the galleries during fire incidents.The FDS software is used to investigate the temperature field variation and CO distribution in concave-shaped cable corridors with different longitudinal slopes(0%～15%),fire source locations,and wind speeds.The results show that the roof temperature has a non-linear relationship with the slope,the highest roof temperature is found at a slope of 9%,and the inflection points are susceptible to different degrees of temperature storage affected by the slope angle.When the inclined section of the corridor catches fire,it is more likely to induce high-temperature collapse and generate higher concentrations of CO.The inflection point poses the greatest threat of thermal damage to the corridor structure when a fire occurs.The concentration and distribution of CO in the concave-shaped utility tunnel are significantly influenced by ventilation.Opening up ventilation is beneficial for the fire evacuation of personnel inside the corridor and reduces the range of structural thermal damage.The research findings can serve as a reference for the fire design of utility tunnels and personnel evacuation.
Concave utility tunnelCable firesFDSTemperature fieldCO distribution
NETL
NSTL
万方数据
