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Full-scale experimental study on fire-induced smoke movement and control in an underground double-island subway station
Tunnelling and Underground Space Technology ( IF 6.7 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.tust.2020.103508
Zeng Long , Chang Liu , Yuxuan Yang , Peiyun Qiu , Xiangliang Tian , Maohua Zhong

Abstract The research carried out full-scale fire experiments for smoke movement and control in an underground double-island subway station. Four kinds of fire scenarios were designed in the station hall and platform respectively, and series of thermocouples were arranged in the public space. Several vital fire parameters were analyzed, including the vertical temperature distribution, the longitudinal temperature distribution, smoke layer height and smoke front arrival time. Besides, the effectiveness of exhaust system was evaluated for fire emergency. The results showed that the smoke flow characteristics under different fire scenarios exhibited diversely. Under natural ventilation, the maximum temperature excess near fire source was 18 ℃ and 21℃ in the station hall and platform fire scenarios separately, and the smoke temperature attenuated gradually with the longitudinal distance from fire. Besides, the smoke layer exceeded the height of 4.0 m and 2.8 m when fire in the station hall and platform. After activating the exhaust system in the B-end, it was obvious that the smoke layer height increased and the temperature excess decreased. Additionally, the smoke front arrival time was influenced by the fire source locations and ventilation conditions. In the above scenarios, the smoke diffusion velocity was empirically determined as 0.11–0.18 m/s and 0.21–0.35 m/s when a fire in the station hall and platform respectively. The conclusions from the on-site fire experiment could provide data support for the fire accident emergency in an underground double-island subway station.

中文翻译:

地下双岛地铁站火灾致烟运动及控制的全尺度试验研究

摘要 研究开展了地下双岛地铁站烟气运动与控制的全尺寸火灾试验。车站大厅和站台分别设计了四种火灾场景,公共空间布置了一系列热电偶。分析了几个重要的火灾参数,包括垂直温度分布、纵向温度分布、烟层高度和烟锋到达时间。此外,还评估了排气系统在火灾紧急情况下的有效性。结果表明,不同火灾情景下的烟气流动特性表现出不同的特点。自然通风条件下,站厅和站台火灾场景中火源附近最高超温分别为18℃和21℃,烟气温度随着离火纵向距离的增加而逐渐衰减。此外,车站大厅和站台发生火灾时烟层高度分别超过4.0m和2.8m。启动B端排气系统后,烟层高度明显增加,温度过剩降低。此外,烟锋到达时间受火源位置和通风条件的影响。在上述场景中,当车站大厅和站台发生火灾时,烟雾扩散速度分别经验确定为0.11-0.18 m/s和0.21-0.35 m/s。现场火灾实验结论可为地下双岛地铁站火灾事故应急提供数据支持。站厅、站台火灾时烟层分别超过4.0m和2.8m。启动B端排气系统后,烟层高度明显增加,温度过剩降低。此外,烟锋到达时间受火源位置和通风条件的影响。在上述场景中,当车站大厅和站台发生火灾时,烟雾扩散速度分别经验确定为0.11-0.18 m/s和0.21-0.35 m/s。现场火灾实验结论可为地下双岛地铁站火灾事故应急提供数据支持。站厅、站台火灾时烟层分别超过4.0m和2.8m。启动B端排气系统后,烟层高度明显增加,温度过剩降低。此外,烟锋到达时间受火源位置和通风条件的影响。在上述场景中,当车站大厅和站台发生火灾时,烟雾扩散速度分别经验确定为0.11-0.18 m/s和0.21-0.35 m/s。现场火灾实验结论可为地下双岛地铁站火灾事故应急提供数据支持。很明显,烟层高度增加,温度过剩减少。此外,烟锋到达时间受火源位置和通风条件的影响。在上述场景中,当车站大厅和站台发生火灾时,烟雾扩散速度分别经验确定为0.11-0.18 m/s和0.21-0.35 m/s。现场火灾实验结论可为地下双岛地铁站火灾事故应急提供数据支持。很明显,烟层高度增加,温度过剩减少。此外,烟锋到达时间受火源位置和通风条件的影响。在上述场景中,当车站大厅和站台发生火灾时,烟雾扩散速度分别经验确定为0.11-0.18 m/s和0.21-0.35 m/s。现场火灾实验结论可为地下双岛地铁站火灾事故应急提供数据支持。站厅和站台发生火灾时分别为35 m/s。现场火灾实验结论可为地下双岛地铁站火灾事故应急提供数据支持。站厅和站台发生火灾时分别为35 m/s。现场火灾实验结论可为地下双岛地铁站火灾事故应急提供数据支持。
更新日期:2020-09-01
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