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Table 1

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By NS Energy Staff Writer 31 Dec 1999

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