169,797 research outputs found
Ancoraggi nei Terreni e nella Rocce
No full textIl volume contiene raccomandazioni tecniche per la costruzione il dimensionamento e la verifica di ancoraggi nei terreni e nelle rocce. Il testo rappresenta una revisione delle precedenti raccomandazioni AICAP del 1993 che tiene conto degli aggiornamenti tecnologici e normativi che sono intervenuti in campo nazionale ed europeo
Predicting tunnelling-induced displacements and associated damage to structures
No full textThe ability to predict with confidence tunnelling-induced displacements and the associated potential for damage to
structures is of increasing importance to the viability of urban tunnelling in soft ground. To assess the response of a structure
to tunnelling the three-dimensional nature of both the structure and the construction process should be taken into
account in a soil-structure interaction analysis. The paper illustrates some of these issues, with reference to a recent study
of the effects of the construction of the new C Line of Roma Underground, currently at the design stage, on several monumental
buildings in the historical centre of the city. The interaction of the running tunnels with the monumental structures
along the proposed route was evaluated with three-dimensional numerical analyses and the potential for damage was assessed
Indagini per l'identificazione e la valutazione dell'efficienza delle fondazioni delle costruzioni esistenti
No full textSi espongono alcune considerazioni sulla scelta e la programmazione delle indagini per l'identificazione e la valutazione delle fondazioni delle costruzioni esistenti. Si sottolinea che le indagini debbono necessariamente riguardare anche i terreni di fondazione, in modo da poter costruire un modello del sistema terreno-fondazioni. Si indicano quindi alcuni dei quesiti da porsi preliminarmente per poter finalizzare il programma delle indagini. Si forniscono brevi cenni su vantaggi e svantaggi delle indagini dirette e indirette. Si illustrano, infine, cinque casi concreti per evidenziare la successione più appropriata dei vari accertamenti, la scelta dei mezzi di indagine e gli insegnamenti che se ne possono trarre
A study of the interaction between the new C line of Roma underground and the Aurelian wall
No full textA study of the effects of the construction of the C Line of Roma Underground on the Aurelian Wall has been carried out as a research project sponsored by the municipality of Roma through STA S.p.A. This paper summarises the results of the study for a section where the two closed-shield (10m in diameter) running tunnels pass directly beneath the Wall, with a skew of about 45 degrees. At first, ground movements induced from construction of the tunnels, for different positions of the excavation face, were estimated in greenfield conditions using empirical methods. In a second stage, three dimensional finite difference analyses were carried out to simulate the interaction between the Wall and the construction of the tunnels. A distinctive feature of the research was the extended investigation aimed at an adequate definition of a model of the subsoil and of the geometry and quality of the foundations of the Wall
The crossing of the historical centre of Roma by the new underground line C: a study of soil-structure interaction for historical buildings
No full textThis work deals with the soil structure-interaction problems posed by the construction of the third line of Roma underground (Line C), which, in its central stretch, crosses the historical centre of the city with significant interferences with the archaeological and monumental heritage. The paper describes the methodological approach developed to evaluate the effects of tunnelling on the existing monuments and historical buildings, starting from a careful geotechnical and structural characterisation and including the development of reliable geotechnical and structural models. Experts in several disciplines were committed to this multidisciplinary work, ranging from geologists to geotechnical and structural engineers, archaeologists, and professionals working in the field of conservation and restoration of works of art and monuments. The study of the interaction between the construction activities and the built environment was carried out following procedures of increasing level of complexity, from green field analyses, in which the stiffness of the existing buildings was neglected, to full soil-structure interaction analyses, performed in both two- and three-dimensional conditions, accounting for the stiffness of existing buildings and considering possible long-term effects. The paper illustrates the main aspects of this procedure, using the example case studies of the Basilica di Massenzio and of the building of the Amministrazione Doria Pamphili
Strategie per la ripresa del paesaggio dell'Italia Centrale. Il modello del piano commissariale per la rigenerazione dell'asse infrastrutturale della Salaria
No full textThe article reports on an applied experience which emerges as a good practice in decision-making processes aimed to integrate different actions within a strategic horizons referred to a territorial dimension.
The opportunity originates from the decision of the Government to develop, through the Commissioner’s nomination, a unitary and comprehensive infrastructural adjustment plan of the entire itinerary of the S.S. 4 Salaria between Roma and Ascoli Piceno. The Commissioner Plan plays a pivotal role in the impulse actions for the restart of the inner areas of the Central Apennines. The Commissioner, within his mandate, has decided to organise his action on two levels: a) a strategic dimension and b) an operational dimension with 54 infrastructure adjustment measures.
A multidisciplinary study has been developed as a reference for the strategic dimension of the Plan. The purpose of the study was to provide a specialist contribution aimed at enhancing the landscape-environmental and historical-cultural values of the places. In the article, referred to the landscape and environmental study, the scientific horizon, the method, the field of investigation, the instruments and data, and the organisation are summarised. A conclusion of the status of implementation of the Plan and its further expected outcomes completes the case presentation
Frane di scivolamento in formazioni rocciose calcaree con interstrati argillosi: un caso di studio nell’Appennino Centrale.
No full textStudio dell’interazione tra le opere della nuova linea C della metropolitana di Roma e le mura aureliane
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