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List of products by author: B. Ring
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Cross-passages in the TBM-tunnels of the Follobanen Project - design under high water pressures in hard rock.
Abstract: A major part of the Follobanen railway tunnel are the twin-tubes of 19 km length, excavated with TBMs almost entirely in hard gneisses. Along the segmentally lined tunnels, 80 openings are foreseen for cross-connections. Their maximum overburden is 150 m with potentially almost the same water level. The openings in the lining are 3.8 m wide and 4.55 m high.In case of high water levels, grouting...
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Design of steel fiber reinforced segmental lining for Line 5, Lot 7 of Metro Sao Paulo
Abstract: The alignment of Metro Line 5 Lot 7 runs for 5.75 km under the city of Sao Paulo with an overburden between 7 m and 47 m. The tunnel is excavated with an EPB-shield of 10.58 m diameter mainly in sands and clays, with a short part where an organic clay layer is encountered within the cross-section. For the horizontal stresses in the ground a coefficient of lateral stress between 0.5 and 0.8 is...
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Segmental Lining Design for Long TBM Tunnels in Hard Rock - Case Study Follo Line Tunnels
Abstract: The two 18 km long TBM tunnels of the Follo Line in mainly very hard rock have an overburden of up to 165 m. Lining design was extensive, having to cover for very different design situations while providing economic reinforcement. Numerical analyses were performed with full 3D-analyses and shift-iteration, Pseudo-3D- and 2D-FE-models for structural verifications and curved shell models for...
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Segmental lining design for the crossing of a railway embankment in soft ground with very low overburden
Abstract: In the southwest of the Netherlands the Sluiskiltunnel is currently under construction. It consists of two machine driven tunnel tubes with an outer diameter of 11 m. At the end of the alignment a 7 m high railway embankment is crossed with an overburden of 9 m. At this location the tunnel is excavated in soft clays and sands, with a peat layer of 50 cm in the tunnel face. Analyses are...
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Two tunnel types with low soft overburden under horizontal stress
Abstract: The alignment of Lot 7 of Sao Paulo’s Metro Line 5 tunnel is 5.75 km long and comprises 6 stations. The double track tunnel is constructed by means of an EPB-shield with an excavation diameter of 10.58 m. A detailed description of the project can be found in Along the alignment a turnover-structure originally named Olimpico is located. This structure is built as a cut & cover box with...
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