中文摘要：

在狭长隧道施工过程中发生盾构机外部配电箱失火的情况下,创建了隧道、火源和通风管道等的网格模型,研究了盾构机水幕系统的阻烟效果.同时,针对原盾构机水幕系统缺陷提出了改进的设计方案,验证了改进后水幕系统的阻烟效果,并分析了水幕系统喷淋头的数目及其水流量对狭长隧道内部烟气扩散的影响.结果表明：开启水幕,可以有效阻止外部烟气向盾构机内侧扩散,保证掘进面附近工作人员的相对安全;合理的喷淋头布局,可以使水滴粒子分布更加均匀,能够更好地阻止烟气的扩散;适度增加水幕系统喷淋头的数目及其水流量,可以提高水幕的阻烟效果.

英文摘要：

In the case of power distribution box fire occurred outside shield machine in narrow tunnel during construction,the mesh model including tunnel,fire source,ventilation pipeline and so on was created and the blocking smoke effect of water curtain was simulated.Then some improvements were made based on the defect of original shield machine water curtain system,and the blocking smoke effect of improved water curtain system was verified.As well as the spread of smoke in tunnel was studied by changing numbers and flow rates of sprinklers.The results show that water curtain can effectively prevent the external smoke from spreading into the side of shield machine and ensure the security of staff near the driving surface.Reasonable sprinklers layout can make the water droplets distribution more uniform,which can prevent the spread of smoke better.And a modest increase in the numbers and flow rates of sprinklers of water curtain system can improve the blocking smoke effect.