Abstract
In order to investigate whether the branch shaft can be used as an evacuation route or a smoke exhaust route in tunnel fire, an experiment was conducted using a tunnel model with a scale of approximately 1/10. The ceiling jet thickness was measured using the temperature rise distribution in the vertical direction. Under the condition of the branch height ratio of 1.0, which is the height ratio of the branch shaft to the main tunnel, the ceiling jet thickness in the main tunnel is larger than that in the branch shaft, on the other hand, under the condition of the branch height ratio of 0.8, the ceiling jet thickness in the branch shaft is larger than that in the main tunnel one. Under the condition of branch height of 0.6, the temperature rise was too little to calculate the ceiling jet thickness in the branch shaft. As a results, it is considered that the branch shaft can be used as a smoke exhaust route when the branch height ratio is 0.8 or more, and can be used as an evacuation route when the branch height ratio is 0.6 or less.
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