Resumo (PT):
Abstract (EN):
In the last decades large and deep cut-and-cover excavations for basements and for
transport infrastructures became very common in urban areas. The solutions that have been constructed
comprehend a large number of structural systems and soil-structure interaction problems. Among the
distinct geotechnical works, deep excavations and their retaining structures were probably the ones whose
analysis and design experienced more progress by the use of finite element models since the seventies. The
chapter presents three topics which are not much widely treated in the specialized bibliography and that
have been of major concern of FEUP¿s geotechnical group and co-workers: deep excavations in thick
deposits of soft clay and rules for a reliable control of the excavation induced movements, with emphasis
on the influence of settlements during the consolidation period; vertical stability of permanent Berlintype
walls in stiff cohesive soils, combining distinct types of numerical modelling, including finite element
limit analyses, since the purpose was to characterize a retaining structure under marginal stability
conditions; elliptical shafts constructed by the sequential excavation method, a novel type of structure
particularly convenient in granite residual soils. Finally, some ideas are presented on possible future developments
in the field.
Language:
English
Type (Professor's evaluation):
Scientific
No. of pages:
26