Deep excavation of Malatesta Station in Rome: Design, construction and measures

摘要

Malatesta station is one of the new Rome urban subway line stations. Its constructionrequired deep excavations in urban area, under high water pressures.Site stratigraphy is characterized by the superimposition of pyroclastic soils, having different cementationdegrees, and Tevere’s alluvional soils. The stratigraphic column base in composed by Monte VaticanoPliocenic Clays and Pleistocene marine Clays, which are typical Rome bedrock.The excavation deepness, the presence of nearby buildings and the high water thrust obliged to use topdownexcavation method and to install a controlled dewatering system.Numerical analysis using FEM were performed and the computation results were compared with thecorresponding field measures results. A wide monitoring activity has been carried out: settlement controlhas been successful and wall movements have been typically small to moderate.