The paper presents a numerical study aimed at investigating the influence of the geometrical design of Tunnel Boring Machines (TBMs) on the forces acting on the lining. The study was conducted using a 3D numerical model that accounts for the major features of the excavation such as front pressure, overcut, shield conicity, tail void grouting, grout hardening over time and installation of the lining. To accurately reproduce the soil-shield-lining interaction, a simple procedure was adopted to overcome the modelling inaccuracies associated with the misidentification of the excavation profile due to the development of pre-convergences ahead of the excavation front. A parametric study was conducted to evaluate the influence of the shield’s conicity and length on the lining forces. The results remark the great influence of the analysed parameters and show that the developed model can provide novel and significant insights on the interaction process.

Influence of TBM geometry on lining loads of deep tunnels / de Gori, V.; de Lillis, A.; Miliziano, S.. - (2021), pp. 266-274. (Intervento presentato al convegno 10th International Symposium on Geotechnical Aspects of Underground Construction in Soft Ground, IS-CAMBRIDGE 2022 tenutosi a Cambridge; United Kingdom) [10.1201/9780429321559-34].

### Influence of TBM geometry on lining loads of deep tunnels

#### Abstract

The paper presents a numerical study aimed at investigating the influence of the geometrical design of Tunnel Boring Machines (TBMs) on the forces acting on the lining. The study was conducted using a 3D numerical model that accounts for the major features of the excavation such as front pressure, overcut, shield conicity, tail void grouting, grout hardening over time and installation of the lining. To accurately reproduce the soil-shield-lining interaction, a simple procedure was adopted to overcome the modelling inaccuracies associated with the misidentification of the excavation profile due to the development of pre-convergences ahead of the excavation front. A parametric study was conducted to evaluate the influence of the shield’s conicity and length on the lining forces. The results remark the great influence of the analysed parameters and show that the developed model can provide novel and significant insights on the interaction process.
##### Scheda breve Scheda completa
2021
10th International Symposium on Geotechnical Aspects of Underground Construction in Soft Ground, IS-CAMBRIDGE 2022
3d modelling; TBM; tunnel excavation
04 Pubblicazione in atti di convegno::04b Atto di convegno in volume
Influence of TBM geometry on lining loads of deep tunnels / de Gori, V.; de Lillis, A.; Miliziano, S.. - (2021), pp. 266-274. (Intervento presentato al convegno 10th International Symposium on Geotechnical Aspects of Underground Construction in Soft Ground, IS-CAMBRIDGE 2022 tenutosi a Cambridge; United Kingdom) [10.1201/9780429321559-34].
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