The paper presents a 3-D numerical strategy developed to accurately simulate the soil-shield and the soil-grout-lining interaction processes associated with the gap closure in mechanized tunneling. The problem is particularly relevant for the structural design of pre-cast lining of very deep tunnels subjected to high stresses.
The railway station Flaminio, currently located at street level, will be relocated underground to connect the railway with the existing line A metro station. This paper describes the technical and technological solutions adopted in the design to minimize tunnelling-induced effects on the surface and, in particular, on an old masonry building, whose foundations are very close to the roof of the new three-tunnel station.
The paper deals with the evaluation of lining forces in TBM-driven tunnels in clayey soils. A 3D numerical model has been developed accounting for the main features of the excavation and construction, such as front pressure, cutterhead overcut, shield conicity, lining installation inside the shield, tail void grouting, grout hardening and injection distance from the shield.
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