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针对某大断面公路盾构隧道火灾烟气控制工程实际,为了优化设计公路隧道集中排烟模式下排烟阀结构参数,采用火灾动力学模拟软件FDS构建了隧道数值模型,并根据公路隧道的通行车辆种类、火灾类型和火灾规模,选择了隧道火灾典型场景,设计了集中排烟模式下单向及双向排烟时相应的火灾工况,通过提取隧道顶隔板下方温度场、行车道2 m高处能见度以及排烟阀流速等数据,分析了双向排烟时特定排烟阀面积下不同排烟阀结构形状对隧道火灾排烟效果的影响,进而探讨了单向排烟方式下不同排烟阀面积时的隧道火灾排烟效果。在此基础上,获得了隧道集中排烟模式下合理的排烟阀面积、排烟阀结构形状等设计参数。
In order to optimize the structural parameters of the smoke exhaust valve in the centralized smoke exhaust mode of a highway tunnel, a fire numerical simulation model FDS for tunnel fire tunnel is established based on the actual situation of fire flue gas control project of a large section highway shield tunnel. Vehicle type, fire type and fire scale, the typical scene of tunnel fire was selected, and the corresponding fire conditions were designed for unidirectional and bidirectional smoke exhaust under centralized exhaust mode. By extracting the temperature field under the tunnel top diaphragm, Altitude visibility and exhaust valve flow rate and other data, analysis of two-way exhaust smoke exhaust valve area under a specific exhaust valve structure shape of the tunnel fire smoke exhaust effect, and then explored the exhaust smoke under different exhaust mode Valve area of the tunnel fire smoke effect. On this basis, the design parameters such as the reasonable area of exhaust valve and the configuration of smoke exhaust valve are obtained under the mode of centralized smoke exhaust in tunnel.