A Safe Evacuation Mode for Ultradeep Underground Space in Urban Rail Transit Stations

Dong, Lili; Wu, Jin; Wang, Wei

doi:10.18280/jesa.520407

Cited by 3 publications

(2 citation statements)

References 10 publications

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“…Currently, the URT parameters are measured either online or offline [11]- [13]. Wang et al [14] proposed the field test method after analyzing the impacts of track-earth transition resistance, track potential and longitudinal track resistance on the return system.…”

Section: Literature Reviewmentioning

confidence: 99%

Design and Simulation of an Intelligent Current Monitoring System for Urban Rail Transit

Yao

Zhao

et al. 2020

IEEE Access

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Many urban rail transit (URT) systems adopt the DC traction power supply system. Because of the impedance and incomplete ground insulation of the running track, it is inevitable for a part of the traction current to flow into the ground from the track, creating the stray current. This type of current causes great safety hazards to the metal structures in and near the URT system. Considering the power supply mode of the URT, this paper explores the different resistances in each power supply section under unilateral power supply and bilateral power supply. Then, the defects of the current discharge method were identified in the context of stray current protection. To solve these defects, the backpropagation neural network (BPNN) was adopted to build a discharge flow prediction model. On this basis, an intelligent current monitoring system was established for the URT. Finally, the authors simulated the impact of each factor on stray current, and verified the reliability and stability of the proposed monitoring system. Compared with predicted values and the actual values, the prediction agrees with the actual data very well. INDEX TERMS Urban rail transit (URT), backpropagation neural network (BPNN), stray current, current monitoring system.

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Section: Literature Reviewmentioning

confidence: 99%

Design and Simulation of an Intelligent Current Monitoring System for Urban Rail Transit

Yao

Zhao

et al. 2020

IEEE Access

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“…These cannot be achieved using only "manual" methods [46]. Presently, scholars have conducted some studies on the evacuation of subway stations [13,[46][47][48][49][50][51][52] and their findings have played a role in the emergency management of UUCs. It should be noted that evacuation for UUCs has started to attract academic attention.…”

Section: Introductionmentioning

confidence: 99%

Study on emergency evacuation in underground urban complexes

2022

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With progressive urbanization and the development and utilization of urban underground space, underground urban complexes (UUCs) have been increasingly used. UUCs have brought much convenience to people’s lives. However, due to their enclosed nature and complexity, it has been an urgent issue to avoid (or reduce) casualties and allow rapid and safe evacuation of people during an emergency. In this study, the evacuation simulation software Pathfinder was used. Based on the steering model, the variation of the total evacuation time and pedestrian flow at main exits with different simulated evacuation measures, congestion at key nodes and people’s path selection were compared and analyzed. Then, the critical locations in the spatial layout of UUCs that were prone to evacuation bottleneck effects were focused on and determined. The evacuation effectiveness of UUCs in an emergency was studied to investigate the problems of emergency evacuation in UUCs. It is found that in UUCs, the bottleneck effects were likely to occur at stairway entrances and exits as well as supermarket checkout counters and caused severe congestion. These locations should be focused on during emergency evacuation. For key locations prone to evacuation bottlenecks, increasing the width of exits or setting up auxiliary evacuation channels could be an effective measure to improve evacuation efficiency. In addition, formulating rational evacuation rules can be a favorable measure for emergency evacuation. However, during the evacuation, the herd mentality in people has an uncertain (positive or negative) impact on evacuation effectiveness. Setting up diversion walls may improve evacuation efficiency and reduce congestion to a certain extent, while evacuation confusion and chaos are prone to occur after diversion. These findings in this study have significant implications for improving the emergency management of UUCs.

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Risk propagation analysis of urban rail transit based on network model

Wang

Jia

et al. 2020

Alexandria Engineering Journal

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A Safe Evacuation Mode for Ultradeep Underground Space in Urban Rail Transit Stations

Cited by 3 publications

References 10 publications

Design and Simulation of an Intelligent Current Monitoring System for Urban Rail Transit

Design and Simulation of an Intelligent Current Monitoring System for Urban Rail Transit

Study on emergency evacuation in underground urban complexes

Risk propagation analysis of urban rail transit based on network model

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