Influence of Ventilation Tube Rupture from Fires on Secondary Catastrophes in Tunnel
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.
tunnel ventilation tube rupture location gas accumulation fire draught fan failure
LI Kun DING Cui YOU Chang-fu
China Academy of Safety Science and Technology. Beijing 100012, China Tinghua Universty, Beijing 100 China Academy of Safety Science and Technology. Beijing 100012, China China University of Mining and Tinghua Universty, Beijing 100084, China
国际会议
The First International Symposium on Mine Safety Science and Engineering (首届矿山安全科学与工程学术会议)
北京
英文
1269-1277
2011-10-27（万方平台首次上网日期，不代表论文的发表时间）