CLIENT:   EEPCO (Ethiopian Electric Power Company) The Gilgel Gibe II Power Station is a hydroelectric power station located on the Omo River, Ethiopia, in the East African Rift Valley. The excavation of the 26km TBM-excavated headrace tunnel experienced very challenging ground … Continue reading →

Geo-Design provided specialist support to the team reviewing the pressure tunnel lining design. This involved a detailed assessment of the ground conditions, with special reference to variability in stiffness of the metasediment geological sequence, to assist with evaluation of the … Continue reading →

Geo-Design acted as specialist support to a project review team. Specialist support included geological characterisation of the volcanic sequence with the aim of recognizing long term durability in the context on an unlined TBM tunnel through complex volcanic rocks.

Investigation and design of a three lane urban highway tunnel under shallow cover in granitic rock for traffic relief in heavily developed area.  Aspects covered included tunnel layout, excavation methodology, lining and ventilation.

Geo-Design undertook an expert assessment of the adequacy of site investigations in terms of scope in relation to the scheme. This comprised: Detailed appraisal of logging and logging procedures Expert reports prepared on the logging and occurrence of marl layers … Continue reading →