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| Exploration of rescue evacuation and ventilation technology for deep buried combined construction method subsea railway tunnel |
| WANG Dongwei1,2, HE Weiguo1,2, DAI Xin1,2, TIAN Feng1,2, CHEN Yang1
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1. China Railway Liuyuan Group Co., Ltd., Tianjin 300308, China;
2. China Railway Underground Space Research and Development Center, Tianjin 300131, China |
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Abstract In order to explore the problems of rescue evacuation and mechanical ventilation in the long-distance, large longitudinal slope and joint conversion of railway tunnels, taking the deep-burned and long-distance combination of railway tunnels-Zhujiangkou Tunnel as an example, the evacuation simulation software Pathfinder was used to simulate the evacuation time in the accident situation of the shield section, mining section and open-dig section of the Zhujiangkou Railway Tunnel, and at the same time, the corresponding rescue evacuation path and mechanical ventilation measures were formulated based on the calculation results. The research results indicated that among the three different construction methods, the shield tunnel section had the weakest capacity for evacuation, and the difficulty of personnel evacuation was relatively high. Evacuation could be carried out simultaneously through the track level rescue channel and the underground evacuation corridor; The inclined shaft in the mining section had the strongest evacuation ability as an emergency exit. Therefore, this project combined the characteristics of each section of the tunnel construction method and adopted a zoning rescue and evacuation method to shorten the tunnel and evacuate from multiple points. According to the calculation results of evacuation time, the necessary safe evacuation time for non fixed point evacuation inside the tunnel was greater than the available safe evacuation time, which could not meet the requirements for evacuation of personnel on fire trains. In case of tunnel fire, the train should be towed outside the tunnel for evacuation and rescue, and only the evacuation and rescue requirements for personnel under train fault conditions were considered inside the tunnel. Emergency exits and shelters were designed for ventilation according to train fault conditions. The ventilation of the evacuation corridor in the shield tunnel section adopted a mechanical air supply method at both ends, and the air supply volume was calculated based on the door opening wind speed method to meet the needs of fresh air for personnel evacuation. Based on the characteristics of crowd evacuation, measures were taken to open 4+1 protective doors near the end of the accident train to overcome the problem of air supply in long-distance evacuation channels. The research results can provide certain reference and ideas for the ventilation design of construction method combined railway tunnels under evacuation and accident conditions.
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Published: 28 March 2025
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