EFFECTS OF TUNNELLING IN URBAN AREAS

Bitetti, Barbara (2010) EFFECTS OF TUNNELLING IN URBAN AREAS. [Tesi di dottorato] (Inedito)

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Abstract

The always increasing demand in new transportation routes in urban area, in the last years, led to the need in increasing the present road transports; by then, the need to use the underground environment for new transportation lines became always more important. New underground lines started to be excavated in many of the largest cities in the world, leading to a large number of shallow and deep excavations in the urban environment. Many tunnels, often located at relatively shallow depth from the ground surface, started to be excavated, inducing not negligible effects on the preexisting buildings. For such a reason, methods directed to the induced tunnelling effects prediction were developed on the basis of empirical data collected all over the years. Despite such empirical methods resulted very useful and reliable for the designing process of a tunnel line, as to predict the tunnel induced displacements on the ground surface, they base on very simplified hypothesis, neglecting important phenomena such as the soil-tunnel-buildings interaction and considering in a simplified way the excavation technique influence. Indeed data collected from literature, demonstrated how the improvements in technologies in the last years allowed an important reductions in induced displacements on the ground surface. For a such a reason numerical analysis of the excavation technique influence on tunnelling induced displacements, became always more significant. Thus, the purpose of this research is to define the importance of excavations technologies, in terms of tunnelling induced effects on the ground surface, inspired by the current construction process of the Line 6 tunnel in Naples. For this purpose, a number of numerical analyses, by means Finite Element codes, were performed as to simulate the tunnel excavation process, and to carry on a parametric study on the technology influence on the induced effects, finally compared to results of a similar parametric study concerning the geotechnical properties of the soils affected by the excavation. Results of such analyses were then used to back-analyze monitoring data collected during the Line 6 tunnelling process.

Tipologia di documento:Tesi di dottorato
Parole chiave:TUNNELLING
Settori scientifico-disciplinari MIUR:Area 08 Ingegneria civile e Architettura > ICAR/07 GEOTECNICA
Coordinatori della Scuola di dottorato:
Coordinatore del Corso di dottoratoe-mail (se nota)
Mancuso, Claudiomancuso@unina.it
Tutor della Scuola di dottorato:
Tutor del Corso di dottoratoe-mail (se nota)
Mandolini, Alessandro
Stato del full text:Accessibile
Data:2010
Numero di pagine:178
Istituzione:Università degli studi di Napoli Federico II
Dipartimento o Struttura:Ingegneria idraulica, geotecnica ed ambientale
Tipo di tesi:Dottorato
Stato dell'Eprint:Inedito
Scuola di dottorato:Ingegneria civile
Denominazione del dottorato:Ingegneria geotecnica
Ciclo di dottorato:23
Numero di sistema:8445
Depositato il:10 Dicembre 2010 08:52
Ultima modifica:23 Giugno 2011 14:50

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