Structural analysis and monitoring for secondary lining of doubled arch tunnel in loess

As the large spanned arch tunnel is influenced by the structure and span, the loads on initial support and secondary lining are different. Based on numerical calculation and monitoring, it was shown that there were different pressures on the initial support and secondary lining. The load on secondary lining was large. The secondary lining was an important part of the supporting structure. The magnitude of the load was affected by the construction duration. It is necessary to know the distribution of load and the construction duration when we design and construct such tunnels.