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
（1. China Railway LiuYuan Group Co., Ltd.， Tianjin 300308，Chian；
2. China Railway Underground Space Research and Development Center, Tianjin 300131，Chian）
Abstract: To explore the difficulties of rescue evacuation and mechanical ventilation for long-distance, large longitudinal slopes, and joint transitions in railway tunnels using various construction methods. Taking the Zhujiangkou Railway Tunnel, a deep buried and long distance subsea railway tunnel with combined construction method, as an example, the evacuation simulation software Pathfinder was used to simulate and calculate the evacuation time of the Pearl River Mouth Railway Tunnel under accident conditions in shield section, mine section and open cut section. At the same time, corresponding rescue evacuation paths and mechanical ventilation measures were formulated according to 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.
王东伟, 贺维国, 戴新, 田峰, 陈洋. 深埋组合工法海底铁路隧道救援疏散及通风技术探讨[J]. 隧道与地下工程灾害防治, .
WANG Dongwei, HE Weiguo, DAI Xin, TIAN Feng, CHEN Yang. Exploration of rescue evacuation and ventilation technology for deep buried combined construction method subsea railway tunnel. Hazard Control in Tunnelling and Underground Engineering, 0, (): 1-12.
