基于隧道新风量需求的活塞风井方案特性研究

以某市域铁路工程为例,通过采用一维数值模拟方法建立模型,对该工程中某一独立地下站设置单、双活塞风井不同方案时的地下区间隧道有效新风量进行分析与研究,在进行隧道新风量模拟计算结果判定与数据拟合的同时,也对影响区间隧道新风量的相关主要因素进行分析研究,主要结论:不同的单、双活塞风井设计方案辅以车站排热通风系统,均可满足隧道新风量需求;轨行区机械排热系统的风量与相应的隧道新风量之间存在线性拟合关系,拟合曲线与隧道新风需求线的交点即为排热风机变频通风量的临界点,对运营模式具有指导意义。

Study on Characteristics of Piston Vent Shafts Design Schemes Based on Tunnel Fresh Air Demand

Based on a suburban rail project, the volumes of fresh air required for the running tunnels are calculated by means of the one-dimensional simulation model in the case that different design schemes of single or double piston vent shafts for one independent underground station are employed. By judging the results of tunnel fresh air volume simulation and data fitting, the main factors that affect the tunnel fresh air volume are analyzed. The main conclusions are as follows: different design schemes of both single and double piston vent shafts supplemented by station exhaust ventilation system can meet the needs of tunnel fresh air volume; there is a linear fitting relationship between the air volume of the station mechanical exhaust system and the corresponding tunnel fresh air volume. The intersection point of the fitting curve and the demand line of the tunnel fresh air is the critical point of the variable frequency of the exhaust fan, which is instructive to operation mode.