地铁长大区间中间风井设置探讨

在地铁长大区间内,最不利情况下发生火灾造成严重影响的事故虽然是小概率事件,但一旦发生,造成的危害和影响极大,因此研究长大区间设置中间风井是必要的。从常规计算方法出发,提出判断是否设置中间风井的新思路,指出常规方法忽略了最不利情况下司机、控制中心的联系时间,在实际工程中建议对站中心运行时间超过2 min的区间进行核算,并充分考虑前车紧急制动停稳时,后车的运动状态。

Setting of Intermediate Air Shafts in Long Sections of the Metro

Despite the small probability of a fire accident occurring in a long tunnel, it can have a significant impact and cause great harm. Therefore, it is necessary to study the placement of intermediate air shafts in long tunnels. Based on the project example and using the conventional calculation method, the author suggests a new way of determining whether to install the air shaft, analyses the risk of the conventional method, and demonstrates that the conventional method neglects the contact time between driver and control center. The author further suggests that a station center running time interval exceeding 2 min should be accounted for in the actual project and fully considers the motion state of the rear train when the front one stops due to emergency braking.