Dynamic Response Analysis of Tunnel Inverted Arch Considering Lining and Surrounding Rock Deterioration

Research purposes; In order to study the vibration response of tunnel inverted arch structure under train load when considering deterioration effect, a dynamic response model of high-speed railway tunnel with inverted arch structure is established based on the engineering background of a high-speed railway tunnel structure in Guinan. The influence of tunnel lining deterioration and surrounding rock deterioration on the dynamic response of inverted arch structure was analyzed.Research conclusions: (1) During the annual deterioration of the lining, the vertical deformation of the inverted arch is almost unchanged, and the acceleration of the measuring point changes to a certain extent in the later stage of service. The maximum principal stress and the minimum principal stress decrease with the increase of deterioration time. (2) During the annual deterioration of surrounding rock, the vertical deformation of inverted arch increases obviously, and the vertical deformation of the central measuring point of inverted arch increases by 75% during 0 ~ 100 years of service. The change law of acceleration is similar to that of lining deterioration, and there is a certain change in the later stage of service. The dynamic stress of inverted arch changes in two stages with the deterioration of surrounding rock, and the dynamic stress increases obviously with the increase of deterioration time in the early stage of service. In the later stage of service (75 ~ 100 a), the dynamic stress decreases with the increase of deterioration time. (3) Compared with the deterioration of lining, the influence of surrounding rock deterioration on the deformation and stress of inverted arch structure is more significant. In the later period of service (75 ~ 100 a), the stress of inverted arch structure changes, so it is necessary to strengthen the inspection and reinforcement of inverted arch structure and surrounding rock mass in the later stage of tunnel service. (4) The research results can provide some theoretical reference for tunnel structure maintenance and risk assessment during service. © 2023 Editorial Department of Journal of Railway Engineering Society. All rights reserved.