An integral part of urban city development is construction of infrastructure, which provides better transport connections and allows city to grow and develop. In Ljubljana road connections prevail over the rail connections and as such requires more urban surface. For
this purpose, many studies and analysis have been made, where tunnels have been considered as an alternative. Our main goal in this thesis was to check if tunnelling with a
TBM technology is applicable. TBM tunnelling in urban areas is well known around the world. It can be applied in diverse geological conditions with a milder impact on surrounding building and environment. City of Ljubljana lies on a quite diverse geological substratum, consisting of gravel deposits of different age, layers of clay with a various thicknesses, with a presence of soft to viscous clay to clayey shale of a perm carbonic age. Evaluation of the TBM application was carried out with a review of existing documentation and completed projects abroad. It has been upgraded with a criteria analysis based on different guidelines and recommendations. Results are showing that for Ljubljana ground structure, two types of
a TBM machines are suitable, namely an EPB and a Slurry machine. An EPB is appropriate for fine-grained soils, which are mainly present in the southern part of the city and a Slurry machine for course-grained soils, which are mainly present in the northern part. Expected
environmental impacts with a TBM tunnelling are milder in comparison with other tunnelling methods, but due to construction in a water protected area, they should be reduced to a minimum level.
|
