首页|Resilience analysis of tunnel lining under creep-induced convergence of soft rock: Characterization and field application
Resilience analysis of tunnel lining under creep-induced convergence of soft rock: Characterization and field application
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NETL
NSTL
Elsevier
Assessment of tunnel lining resilience is critical to ensure long-term structural stability under soft rock excavation. In this paper, a novel analytical approach is proposed to assess its performance, considering the time-dependent properties of tunnel deformation. Based on the complex stress behavior of lining, the ratio of compressive and tensile stress to its strength is selected as a performance indicator (Q) of resilience. A new resilience metric (Re) is defined to explore the non-uniform stress behavior of the lining. This metric is calculated as the ratio of the integral of disturbed Q to that of undisturbed Q by incorporating the spatial parameters of the lining. Subsequently, the rationality and applicability of the proposed method are validated through a case study involving a diversion tunnel exhibiting time-dependent deformation behavior. The parameters of compressible layer support are optimized based on Re. The results indicate that the lining Re decreases substantially (Re < 0.6) within three years and stabilizes at 0.34 after 50 years. The analysis of lining Q behavior reveals that the arch foot and invert experience more substantial reductions in Q during operation. The incorporation of compressible layers as support enhances the sustained resilience of the lining once a critical threshold is reached, maintaining Re at an approximately constant level over time. This improvement depends on the energy absorption capacity and utilization efficiency of compressible layers.
Soft rock tunnelLining performanceResilience assessmentCompressible layer supportSEISMIC RESILIENCECONCRETE
NETL
NSTL
Elsevier
