侧式地铁站隧道口边界条件替代方案研究

Alternative Solution to the Boundary Conditions of Tunnel Entrance at the Side-platformMetro Station

为了验证岛式地铁站隧道口边界条件等效替代方案在侧式地铁站中的适用性,以我国典型的侧式地铁站为例,运用FDS（火灾动力点模拟）软件开展了各种边界条件下的火灾数值模拟,并与岛式地铁站的模拟结果作对比分析。研究结果表明：侧式地铁站隧道口等效宽度系数在0.72-0.73之间。考虑到计算网格设置的因素,建议等效宽度系数取0.70。这说明在相当的边界条件下,地下侧式车站的等效宽度系数是地下岛式车站的1.57-1.66倍,地铁站的隧道口边界条件的等效替代方案受地铁站结构形式和排烟方式的影响很大,不能混用。

In order to verify the feasibility of applying alternative solution to the side-platform metro station in terms of the boundary conditions of tunnel entrance at the island metro station, the typical side-platform metro station in China is taken as the example, FDS （fire dynamics simulation） software is used for fire numerical simulation in different boundary conditions, and the simulation results are compared with that of island-type station. This research shows that the equivalent width coefficient of the tunnel entrance at the side-platform metro station is in the range of 0.72-0.73, with a consideration of the grid setting, 0.70 is recommended. In same boundary conditions, the equivalent width coefficient of the side-platform metro station is 1.57- 1.66 times of the island-type station. However, the alternative solution to the boundary conditions of tunnel en- trance is greatly influenced by the structure form and smoke control method of the station, and any kind of mixture is not operative.