The Manapouri second tailrace tunnel project consists of a six mile, 33 foot diameter tunnel through hard rock.
The contractor had difficulties with penetration rate and utilization of the TBM due to unexpected rock conditions.
Deere & Ault Consultants, Inc. staff was contracted by the owner to develop a comprehensive rock sampling and laboratory testing program in order to evaluate the actual conditions being encountered.
Deere & Ault staff’s presentation of the rock properties was instrumental in reaching a favorable settlement for the owner.
Client: Meridian Energy Limited