Abstract
The determination of the optimal liner thickness is an important task in the design of tunnels. To take into account the heterogeneous characteristic in nature of the surrounding rock mass, the deterministic approach by using the factor of safety of different parameters involved in the design process has been largely chosen. However, this approach can overestimate or underestimate the support thickness, particularly in the case of highly heterogeneous rocks. As an improvement, the application of the probabilistic methods in the design process to optimize the liner thickness, known as the Reliability-Based Design Optimization (RBDO) has been intensively conducted in the last decade. In this context, the present contribution aims at optimizing the liner thickness of the deep tunnel excavated in a viscoelastic medium (Burgers rock) by performing the probabilistic method (Subset Simulation (SS)). This developed RBDO process allows considering the elapsed installation time of liner with respect to the excavation of the tunnel while the optimal liner thickness is determined from two failure modes, namely the support capacity criterion and the maximum tunnel convergence.
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Tran, NT., Do, DP., Hoxha, D., Vu, MN. (2020). Reliability-based design of deep tunnel excavated in the viscoelastic Burgers rocks. In: Duc Long, P., Dung, N. (eds) Geotechnics for Sustainable Infrastructure Development. Lecture Notes in Civil Engineering, vol 62. Springer, Singapore. https://doi.org/10.1007/978-981-15-2184-3_48
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DOI: https://doi.org/10.1007/978-981-15-2184-3_48
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