Geovert assessed the feature with NZTA engineer’s Opus, and determined the rock mass was failing in a combination sliding
rotational toppling mechanism with less than 10% of the toe area
providing the only point of attachment.
As a result of this inspection the road was closed to all traffic until the drill and blast removal of a 25m high 2000 tonne unstable rock mass was removed. This was located 900m vertical above the western portal of the Homer Tunnel at 1800m ASL and the contract period began in May which meant dealing with severe alpine weather conditions.