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Abstract: During TBM-excavation of water transfer tunnel in Thailand, the “Fault 26 Incident” appeared at km. 11+675 on Dec. 20th, 2018. The unexpected large cavern was encountered by the cutter head of the TBM. The cavern was inspected and surveyed. A ground area of about 1,800m² (50x40m), was partially filled with huge blocky rock boulders reaching up to about 10m above tunnel invert. The length of the...