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首页> 外文会议>International Symposium on Mine Safety Science and Engineering >Influence of Ventilation Tube Rupture from Fires on Secondary Catastrophes in Tunnel
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Influence of Ventilation Tube Rupture from Fires on Secondary Catastrophes in Tunnel

机译：通风管破裂从火灾对隧道中次灾害的影响

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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 400 kW. 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 1200 kW, gas explosion will not happen but the secondary catastrophes will appear when the fire intensity is further increased.
机译：基于3-D隧道模型，当触发发生时，已经研究了通风管破裂的影响，其位置和在第二次灾难上停止工作的风扇。结果表明，当通风管破裂时，出现“第二涡流”，气体浓度显示“上下” - “左右” - 从隧道端到出口的均匀分布。当管断裂位置大于30米时，气体浓度在5％〜16％之间的体积增加，然后随着火强度的增加而降低，当火强度等于400 kW时，它达到其最大值。但由于低温，这不会引起煤气爆炸。风扇关闭后，煤气和烟雾在隧道屋顶上显示了明显的分层分布和浓度。当火强度为1200 kW时，不会发生气体爆炸，但在火强度进一步增加时会出现二级灾难。

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