Abstract
Based on the 3-D tunnel model, the influence of ventilation tube rupture, its locations and the draught fan stopping working on second catastrophes has been investigated when fires happen. The results show that when the ventilation tube ruptured, “the second vortex” appears and the gas concentration shows “up-down” –“left-right”-uniform distribution from the tunnel end to the outlet. When the tube broken position is larger than 30 m, the volume where the gas concentration is between 5%∼16% increases first and then decreases as the fire intensity increases and it reaches to its maximum value when the fire intensity equals to 400kW. But due to low temperature, this will not induce to gas explosion. The coal gas and smoke show an evident layered distribution and concentration on the tunnel roof after the fan shut down. When fire intensity is 1200kW, gas explosion will not happen but the secondary catastrophes will appear when the fire intensity is further increased.
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