Abstract
What will be the longest continuous road tunnel north of the Alps is being driven by drill and blast methods in Hordaland County in Western Norway. The 7523M long, 9M wide Vallavik Road Tunnel will connect the rural communities of Vallavik and Granvin. The tunnel will be finished to profile C on the standard Norwegian road tunnel profile scheme. Excavation is being carried out by an Atlas Copco Promec 470 3-boom hydraulic jumbo blasting a 60 sq.m cross-section. Also being constructed is the 6422M long, 8M wide Fjaerland Tunnel being driven by drill and blast methods through hard gneiss. The tunnel excavation is of interest because it passes beneath the Jostedalsbreen Glacier. Geological conditions consist of banded gneiss changing to massive augen gneiss under high stress with extensive spalling, giving rise to rockbursts. Also described is the excavation of the 1350M long, 9.4M wide curved Honganvik Tunnel under the Bridge's Veil Waterfall. The tunnel is being built on national highway 13 to give an all-year-round road from Stavanger to Sauda. The tunnel is being driven by an Atlas Copco Boomer H170S Drifer equipped with three booms. Geology consists of gneiss rappe thrust over phyllite formations with severe faulting causing some construction problems. (TRRL)
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