The paper deals with the evaluation of lining forces in TBM-driven tunnels in clayey soils. A 3D numerical model has been developed accounting for the main features of the excavation and construction, such as front pressure, cutterhead overcut, shield conicity, lining installation inside the shield, tail void grouting, grout hardening and injection distance from the shield. To accurately simulate the soil-shield and the soil-grout-lining interaction processes associated with the gap closure, the algorithm works in large-strain mode, thus updating the grid nodes position after each calculation step. A comparison between numerical results and monitoring data recorded during the construction of a hydraulic tunnel in fine-grained soils is presented. The collected data show the evolution of the lining forces due to the advancement of the excavation in undrained conditions and during the subsequent consolidation process. The results confirm the effectiveness of the proposed numerical approach as a design or analysis tool.
Lining stresses in a TBM-driven tunnel: A comparison between numerical results and monitoring data / De Gori, V.; De Lillis, A.; Miliziano, S.. - (2019), pp. 3634-3643. (Intervento presentato al convegno World Tunnel Congress, WTC 2019 and the 45th General Assembly of the International Tunnelling and Underground Space Association, ITA-AITES 2019 tenutosi a Naples, Italy) [10.1201/9780429424441-385].
Lining stresses in a TBM-driven tunnel: A comparison between numerical results and monitoring data
De Lillis A.
;Miliziano S.
2019
Abstract
The paper deals with the evaluation of lining forces in TBM-driven tunnels in clayey soils. A 3D numerical model has been developed accounting for the main features of the excavation and construction, such as front pressure, cutterhead overcut, shield conicity, lining installation inside the shield, tail void grouting, grout hardening and injection distance from the shield. To accurately simulate the soil-shield and the soil-grout-lining interaction processes associated with the gap closure, the algorithm works in large-strain mode, thus updating the grid nodes position after each calculation step. A comparison between numerical results and monitoring data recorded during the construction of a hydraulic tunnel in fine-grained soils is presented. The collected data show the evolution of the lining forces due to the advancement of the excavation in undrained conditions and during the subsequent consolidation process. The results confirm the effectiveness of the proposed numerical approach as a design or analysis tool.File | Dimensione | Formato | |
---|---|---|---|
DeGori_Lining_2019.pdf
solo gestori archivio
Tipologia:
Versione editoriale (versione pubblicata con il layout dell'editore)
Licenza:
Tutti i diritti riservati (All rights reserved)
Dimensione
1.12 MB
Formato
Adobe PDF
|
1.12 MB | Adobe PDF | Contatta l'autore |
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.