Hegan, B.D. 1978 Moawhango-Tongariro tunnel - invert failures. Lower Hutt: New Zealand Geological Survey. New Zealand Geological Survey report EG 306 16 p.
Abstract: This report reviews the twenty-two invert failures that have occurred to-date in the Moawhango-Tongariro tunnel. In an attempt to establish any causal relation of the failures with geology, the engineering geological conditions at each site have been appraised using the tunnel logs (the as built tunnel records) as the main source of relevant data. (auth)