The behaviour of the cast in situ retaining walls of Seville Underground

摘要

The Seville Underground now has nearly 19 km of Line 1 in operation crossing the city from EastrntoWest. The centre of the Line (old urban area) is built with a double tunnel, excavated with an EPB machine,rnbut the main part of the Line was built with cast-in situ wall solutions. The ground of the city is formed by sandyrnclayey Quaternary sediments, of medium-low consistence, covering a thick stratum of gravel (8–10mthick). Thernnear substrate is constituted by a formation of Miocene and fissured stiff clays, that have been studied in previousrnworks. The continuous walls generally cross the upper sediments and gravel and penetrate in the Miocene clays,rnto achieve interior excavation with little water seepage. These walls are instrumented in several sections. Withrnthe results obtained (mainly, horizontal movements) and the corresponding numerical simulations, the behaviourrnof these structural elements has been studied and the geotechnical properties of the soils affected concluded.rnThis paper provides the analysis and results obtained, that will be used as the basis for designing and buildingrnnew lines in the Seville Underground.