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In this paper the geomechanical aspects of the Sevilla City (South of Spain) and their general geotechnical problems are summarized. In the Sevilla ground an important thickness of quaternary sediments are detected, with the predominium of gravel and sandy gravel soils. The next substratum is performed by marly clays (Guadalquivir Blue clays), the excavations are conditioned by the presence of a very high phreatic level, due to influence of the Guadalquivir River (one of the most important rivers of the Iberian Peninsula) and the depth of the marly clays. For this motive the tunnel line affect, mainly, to the gravel sediments. Special attention to the zone excavated by a E. P. B. shield (LOVAT kind) are carried out: Two parallel tubes, excavated with a T. B. M. with Ø 6,20 m. The presence of near structures and two parking lots on the tunnels, introduce any special conditions. Several ground treatments have developed for the protection of these structures and the actual channel of the Guadalquivir River. The paper describes the special works carried out and, also, the controls of movements developed. The results of the auscultation principally) and the special events are summarized.
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