A case of damages in the secondary lining of a multiarch tunnel is studied by field investigation and numerical analysis, which is subject to asymmetry pressure and buried at shallow depth. The study focuses on the key influencing factors inducing these damages. The numerical analysis is implemented, taking account of the possible influencing factors obtained from field investigation, in which two cases with different numerical models are utilized to discriminate the effects caused by shallow tunnel depth and asymmetric pressure on the tunnel comparatively. The numerical result demonstrates that the topography with shallow depth and asymmetry pressure has much influence on the safety of the multiarch tunnel’s structure, and the cause of damages in the multiarch tunnel structure can be analyzed by field investigation and numerical simulation, which can provide the design basis for appropriate strengthening of the damaged tunnel structure.

This paper presents a case study of damage in the concrete lining of an operational tunnel by field investigation and numerical analysis, in which the field-investigated construction deficiency is considered in the numerical model, and the implemented numerical analysis is adopted for investigating the effect of damaging in the structure of the operating tunnel induced by the construction deficiency. The numerical analysis illustrates that the construction deficiency of a cavity can influence the stress state of a tunnel structure and plays an important role in the stability of the operating tunnel, which results in significant influence on the damage in the concrete lining of the operating tunnel and must be timely treated to prevent subsequent damage in the tunnel lining. Moreover, the numerical model considering construction deficiency of a cavity around the tunnel is efficient for evaluating the effect of damaging the structure of the operating tunnel induced by this construction deficiency.

In this study, the effect of the high‐speed train vibration loading on an adjacent damaged tunnel is investigated. Three sets are established to study the effects of the different vibration loadings on the tunnel lining considering the vertical excitation force of the CRH (China Railway High‐speed) train. An expression of excitation force for the train vibration loading is applied to simulate the interaction force between wheel and rail, which is set with high‐, medium‐, and low‐frequency responses, and reflects the influences of driving comfort, additional dynamic load, and rail corrugations. The eigenvalue analysis and spring damping absorbing boundary are applied in the numerical simulation. In addition, a quantitative criterion is selected as the allowable vibration peak velocity for the cracked structure. The analysis of the vibration velocity, dynamic deformation, and acceleration of the cracking region show that the secondary lining of this damaged tunnel in set 1 basically has a higher vibration response than that in set 2 for the closer running track. The most adverse working condition with the greatest impact on the lining structure is that two CRH trains simultaneously passing through the cross section in set 3.