Journal
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
Volume 24, Issue 6, Pages 627-633Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tust.2009.06.001
Keywords
Tunnel; Fire; Natural ventilation; Temperature; Smoke spreading; Downdraught
Funding
- Natural Science Foundation of Province Jiangsu in China [BK2008369]
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Three full-scale burning tests were conducted in a natural ventilation city road tunnel with shafts. Fire sources were placed to be at different locations but its peak release heats were all around 5 MW. Results showed that large amounts of smoke and heat were released through shafts. The maximum smoke temperatures under the ceiling were below than 100 degrees C, and being lower than 110 degrees C at the safe height farther 3 in away from fires. The maximum smoke spreading horizontal lengths were less than 240 m both in the upwind and downwind. During the late stages, many smoke particles descended from the ceiling and downdraught occurred at shafts due to low smoke temperatures, but the visibility was not very bad and people needn't evacuate. All These results are valuable for fire protection and construction of natural ventilation road tunnel with shafts. (c) 2009 Elsevier Ltd. All rights reserved.
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