List of products by author: N. Rubiralta

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  Twin Tunnels Critical Underpass during Sofia Metro Line 3 Extension

  Abstract: Project Extension of Sofia metro, Line 3, phase I, aims to build almost 8 km of a metro single tube excavated by a 9.4 m EPB Machine and seven new stations. TBM drive challenged the underpass of two existing 5.2 m internal diameter tunnels with tight overburden of only 1.4 m; few meters prior TBM breakthrough into Metro Station 8, which increased the complexity of the operations. Ground...

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