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Recently, an urban tunnel has been bored for the extension of the Line 2 of Madrid Underground (Spain). The ground excavated is the typical of the middle of Spain: Over consolidated tertiary sediments. This preconsolidation is originated by two factors: a) The ground overburden (50–100 m thickness, removed by the Pliocenic erosion). b) The cementation induced by the presence of pheldespated and quartz crystal. The granulometry of overconsolidated materials is variable (25–80% fine content). The excavation in these materials has been performed by a E.P.B. shield machine, Ø9.40 m. In this paper are presented: a) The geotechnical properties of the excavated materials. b) The tunnel auscultation and the movement measurements. A comparison between these measurements and the previous settlement estimation (by the subsidence Madrid Model) has been introduced.
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