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Table 1: The FEM models used for the analyses

Model Geometry Number of stage Stages
URFA1 One tunnel-semi section 1 Excavation & installation of shotcrete
URFA2 One tunnel-semi section 2 Excavation & installation of shotcrete and rock bolts
URFA3 One tunnel-semi section 3 Excavation & installation of shotcrete and rocks bolts & excavation of invert section
URFA4 Two tunnels-full section 4 Excavation of tunnel T1 & installation of temporary support for tunnel T1 & excavation of tunnel T2 & installation of temporary support for tunnel T2