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Stress relaxation in rock after excavation of a circular water tunnel and installation of a liner is examined with FLAC. The liner is installed and pressurized instantaneously to permit the stress field to respond to radial strain in the liner.

Keywords:

• tunnel excavation
• stress relaxation
• liner
• Pore pressure
• effective stress analysis
• Mohr-Coulomb model

Materials:

• Clay
• Concrete
• Rock

Analyses:

• Fluid Flow
• Static