Study On Service Safety Evaluation And Monitoring Method Of Yiwan Railway Tunnel

This thesis relies on the science and technology research project of China Railway Wuhan Bureau Group Co.,LTD."Research on Yiwan Railway Flood Control Safety Monitoring System Based on Wireless Internet of Things Technology"(Project No.: 19G09),taking Gaoyangzhai Tunnel of Yiwan Railway as the key project,using field investigation,literature research,numerical simulation and other methods,aiming at the main tunnel disease types faced by the public works department,the safety evaluation method suitable for the tunnel section of Yiwan Railway operation is studied;According to the disease monitoring requirements after tunnel safety evaluation,the tunnel safety monitoring system is developed and operated based on the low-power wireless Internet of Things technology to monitor the main diseases,so as to help the public works department grasp the disease development status and take timely measures to ensure the safety of tunnel operation.The main contents and conclusions are as follows:(1)Through field investigation and literature research,the main types of tunnel diseases existing in the current Yiwan Railway operating tunnel are analyzed.The common disease types and hazards of operating tunnels were investigated,and the man-made construction factors and environmental factors of the occurrence of the disease were analyzed,so as to provide a reference for the disease safety evaluation of Yiwan Railway operating tunnels and the disease disposal measures after the evaluation.(2)Using the numerical simulation method,this thesis analyzes the influence of secondary lining void or karst water disease on the tunnel under different surrounding rock conditions and different dangerous states,and reveals the influence of different secondary lining void degree on structural deformation and stress,and the influence of different karst water conditions on tunnel water pressure and drainage.The relevant conclusions can provide a basis for the safety evaluation and safety monitoring of subsequent tunnel diseases.(3)According to the main disease types of Yiwan Railway tunnel,the states of different diseases are quantified and classified,and the safety evaluation method suitable for the operating tunnel section along the line is constructed.Based on the safety grade evaluated by the safety evaluation method,disposal measures such as strengthening monitoring and lining reinforcement are taken for the corresponding tunnel disease section.(4)According to the monitoring requirements after the safety evaluation of the main diseases in the tunnel section,a remote unmanned monitoring system for the key diseases of Yiwan Railway tunnel is constructed by using low-power wireless Internet of things technology.By monitoring the characteristics of different key disease indicators,it helps the public works department to grasp the state of tunnel disease and take corresponding disposal measures in time to ensure the safety of railway tunnel operation.