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What is High Tunnel Convergence Analysis about?
1) The 7 km Ganntas Tunnel in Algeria experienced extreme squeezing and high convergences over 100 m when excavating through a fault zone in soft clayey marls. 2) Back analysis determined the rock mass parameters were significantly weaker than initial estimates, with stiffness reduced by 50% and resistance reduced by 35%. 3) Stability analysis showed an extensive plasticized zone ahead of the tunnel face, indicating critical instability and the need for strong tunnel face support.
- Author
- Anonymous Gon7kIs
- Language
- EN