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A platform for research: civil engineering, architecture and urbanism
The Bolmen Tunnel — tunnelling through the Staverhult Fault Zone
Abstract The construction of the 80-km long Bolmen Tunnel has necessitated the incorporation of engineering geology as an important part of the project. Site investigations were intensified where extensive faulting in the rock was expected. The aim of the investigations was to find the most economically favourable tunnel line through the zones of faulting. Earlier investigations were supplemented, in conjunction with the start of work on the northern part of the Bolmen Tunnel, by additional geophysical measurements, especially around the Staverhult Zone. As a result of the measurement values obtained, 2 km of the tunnel line was relocated 75 m to the east of the original line. The predicted geologic model that was prepared on the basis of the geophysical investigations indicated major faulting in the rock over a distance of about 300 m. The relocation of the tunnel line reduced the distance along the tunnel affected by the faulting to 140 m. A well-planned method of tunnelling was prepared to achieve a high rate of production and safe working conditions. The method was used in driving through the zones of faulting and, at the same time, the predicted geologic model was checked in step with the work. The geological conditions encountered agreed well with the model that had been predicted. Tunnelling through the zone of faulting was completed without mishap, and the method used should hold a large potential in many practical applications.
The Bolmen Tunnel — tunnelling through the Staverhult Fault Zone
Abstract The construction of the 80-km long Bolmen Tunnel has necessitated the incorporation of engineering geology as an important part of the project. Site investigations were intensified where extensive faulting in the rock was expected. The aim of the investigations was to find the most economically favourable tunnel line through the zones of faulting. Earlier investigations were supplemented, in conjunction with the start of work on the northern part of the Bolmen Tunnel, by additional geophysical measurements, especially around the Staverhult Zone. As a result of the measurement values obtained, 2 km of the tunnel line was relocated 75 m to the east of the original line. The predicted geologic model that was prepared on the basis of the geophysical investigations indicated major faulting in the rock over a distance of about 300 m. The relocation of the tunnel line reduced the distance along the tunnel affected by the faulting to 140 m. A well-planned method of tunnelling was prepared to achieve a high rate of production and safe working conditions. The method was used in driving through the zones of faulting and, at the same time, the predicted geologic model was checked in step with the work. The geological conditions encountered agreed well with the model that had been predicted. Tunnelling through the zone of faulting was completed without mishap, and the method used should hold a large potential in many practical applications.
The Bolmen Tunnel — tunnelling through the Staverhult Fault Zone
Bäckblom, Göran (author) / Stanfors, Roy (author)
Engineering Geology ; 23 ; 45-57
1986-03-26
13 pages
Article (Journal)
Electronic Resource
English
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