Study on the Influence of a Train Vibration in a Railway Tunnel on the Underneath Diversion Tunnel

Combining the condition of three cascaded hydropower station projects taking place underneath the Shoubayan tunnel in the Neikun railway in Yanjing country Yunnan Province with numeric simulation and live monitoring, train vibration influence on the underneath diversion tunnel is studied. The results show that under the load of train, the structure of the diversion tunnel will form a dynamic response of a simple harmonic wave, and this kind of response will fade away in a period of time after the train goes away. The vertical displacement and vertical pressure are both very low, and the security index and fatigue intensity also meet the requirement, proving that the structural lining is not damaged by the train vibration. Every inspection point's numerical simulation and monitoring results correspond to each other, it proves that the assumptions that this study adopted are consistent with actual conditions, the calculating result has a high quality of reliability, and similar projects could adopt this method to analyze train vibration.