A numerical case study on the long-term seismic assessment of reinforced concrete tunnels in corrosive environments

Αντωνίου, Μαρία; Mantakas, Antonios; Nikitas, Nikolaos; Fuentes, Raúl

doi:10.1016/j.jrmge.2022.10.003

Cited by 11 publications

(1 citation statement)

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“…The irreversible permanent deformation of the tunnel was led by the creep-slip displacement of the fault and subsequent seismic shaking. Referring to the schematic diagram on the sequence of events used by Antoniou et al [54], Figure 11 illustrates the variation in permanent strain (accumulated residual strain) in the lining crown and invert (cross-section 2-2), as well as peak strain and seismic strain (peak strain minus residual strain) in each case, respectively. Figure 11 shows the peak strain of the tunnel with the isolation layer was significantly lower than the one without the isolation layer.…”

Section: Dynamic Strain Responsesmentioning

confidence: 99%

Dynamic Response of Tunnels with a Rubber-Sand Isolation Layer under Normal Fault Creep-Slip and Subsequent Seismic Shaking: Shaking Table Testing and Numerical Simulation

et al. 2023

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Tunnels may suffer severe damage when passing through an active fault in high-intensity earthquake zones. The present study aims to investigate the performance of an isolation layer composed of a rubber-sand mixture, an emerging trend in low-cost seismic mitigation studies. Based on the Ngong tunnel in the Nairobi-Malaba Railroad in Kenya, Africa, the effect of the rubber-sand isolation layer on the acceleration and strain of the tunnel lining was investigated through a shaking table test under small normal fault creep-slip and subsequent seismic shaking. The influences of the length of the isolation layer and the rubber content in the mixture were analyzed by numerical simulation. The results indicate that the isolation layer slightly reduces the acceleration response of the tunnel lining within the fault and obviously reduces the permanent strain of the invert and crown within the fault under small normal fault creep-slip and subsequent seismic excitation. The mitigation effect of the isolation layer is related to the length of the isolation layer and the rubber content in the mixture. In the case of this study, the length of the isolation layer is triple the fault width (influence range of the fault) and the appropriate enhancement of the rubber content of the isolation layer offers favorable conditions for mitigation effect, respectively.

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Section: Dynamic Strain Responsesmentioning

confidence: 99%