市域快速轨道交通难免以隧道形式穿越大江大河,有必要探究市域快速轨道交通水底隧道防灾救援方法.依托温州市域铁路S2线瓯江北口隧道的工程实例,从工程应用、疏散效果、施工风险、结构受力、经济性、适用范围等方面,对比分析水底隧道受灾人员常见疏散方式,确定瓯江北口隧道受灾人员疏散方案;采用FDS软件模拟瓯江北口隧道不同火灾工况下,烟气、温度、可见度蔓延情况,以及安全疏散时间与距离火源位置关系.分析结果表明:隧道内发生火灾时,开启风机可使排烟效果得到明显提高,有利于人员安全疏散.%Since the rapid metropolitan rail transit would inevitably cross sea and great rivers in the form of tunnel, it is necessary to explore disaster prevention and rescue system of the under-river tunnel. This paper takes the under-river tunnel at north mouth of Oujiang along the S2 rail transit in Wenzhou as the project example, compares and analyzes the common modes of evacuation for the victims at the under-river tunnel and determines the tunnel scheme in terms of engineering application, evacuation results, construction risks, structure stress, economy and application scope. The paper uses FDS software to simulate the smoke, temperature, visibility and relation between the evacuation time and the location of fire in the case of the under-river tunnel at north mouth of Oujiang. The results indicate that it's beneficial to start the fan to improve smoke ventilation for safe evacuation when fire breaks out at the tunnel.
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