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Analysis of the Dynamic Response of Twin-tunnel Rail Sleepers and Lining under the Action of Trains
(1. School of Transportation and Logistics Engineering, Wuhan University of Technology, Wuhan 430063; 2. School of Civil Engineering and Architecture, Wuhan Institute of Technology, Wuhan 430073)
Abstract To study the dynamic response of closely-spaced subway twin tunnels under the action of train vibration, this paper establishes a discrete element model of twin tunnels based on particle flow code (PFC). The model simulates three scenarios during subway operation to analyze the impact of a single passing train (with 6 carriages) on the adjacent tunnel and its own tunnel, as well as the impact of two simultaneously passing trains on the twin tunnels.The results show that after the train enters the tunnel (1-3 carriages), there is a gradual increase with fluctuations in the vertical dynamic response of the tunnel , and then (4-6 carriages), the peak vertical dynamic response of the tunnel gradually stabilizes, and the vertical vibration amplitude of the lining of its own tunnel is, on average, 23% smaller than that of the adjacent tunnel. The dynamic response of the tunnel lining reaches its maximum value when the two trains are passing simultaneously with a maximum vibration displacement of 6.4 mm, which occurs near the middle of the twin tunnels. This indicates that closely-spaced twin tunnels should be monitored for lining vibrations near the middle area with a focus on preventing microcracking.
Abstract：
To study the dynamic response of closely-spaced subway twin tunnels under the action of train vibration, this paper establishes a discrete element model of twin tunnels based on particle flow code (PFC). The model simulates three scenarios during subway operation to analyze the impact of a single passing train (with 6 carriages) on the adjacent tunnel and its own tunnel, as well as the impact of two simultaneously passing trains on the twin tunnels.The results show that after the train enters the tunnel (1-3 carriages), there is a gradual increase with fluctuations in the vertical dynamic response of the tunnel , and then (4-6 carriages), the peak vertical dynamic response of the tunnel gradually stabilizes, and the vertical vibration amplitude of the lining of its own tunnel is, on average, 23% smaller than that of the adjacent tunnel. The dynamic response of the tunnel lining reaches its maximum value when the two trains are passing simultaneously with a maximum vibration displacement of 6.4 mm, which occurs near the middle of the twin tunnels. This indicates that closely-spaced twin tunnels should be monitored for lining vibrations near the middle area with a focus on preventing microcracking.
MENG Xiancong1 ZHANG Xiedong1 WU Lin2 ZHU Haojie1 LI Zhifeng1
.Analysis of the Dynamic Response of Twin-tunnel Rail Sleepers and Lining under the Action of Trains[J] MODERN TUNNELLING TECHNOLOGY, 2022,V59(3): 99-106
2022, Vol. 59 