The paper describes the results of a study carried out to analyse the surface settlements induced by the excavation of the Milan underground new line 5 by an earth pressure balance (EPB) machine in granular soils. Settlements measured during the construction under green-field conditions are presented and interpreted using the classical Gaussian empirical prediction and are compared to numerical predictions obtained by finite element calculations performed with the software Plaxis 2D. A simple linear elastic-perfectly plastic Mohr-Coulomb model (MC) and the more advanced Hardening Soil with small strain model (HSsmall) were adopted for the description of the soil behaviour. It was observed a very good agreement between the numeri-cal solution obtained using the HSsmall constitutive model and the monitoring data. On the contrary, the pre-diction computed using the MC model was found to highly underestimate the maximum settlement and to produce a much wider subsidence curve than the empirical ones.

Numerical prediction of tunnelling-induced settlements in coarse-grained soils / Fargnoli, V.; Boldini, D.; Amorosi, Angelo. - STAMPA. - 2:(2014), pp. 827-832. (Intervento presentato al convegno 8th European Conference on Numerical Methods in Geotechnical Engineering, NUMGE 2014 tenutosi a Delft, nld nel 2014).

Numerical prediction of tunnelling-induced settlements in coarse-grained soils

Boldini, D.;AMOROSI, ANGELO
2014

Abstract

The paper describes the results of a study carried out to analyse the surface settlements induced by the excavation of the Milan underground new line 5 by an earth pressure balance (EPB) machine in granular soils. Settlements measured during the construction under green-field conditions are presented and interpreted using the classical Gaussian empirical prediction and are compared to numerical predictions obtained by finite element calculations performed with the software Plaxis 2D. A simple linear elastic-perfectly plastic Mohr-Coulomb model (MC) and the more advanced Hardening Soil with small strain model (HSsmall) were adopted for the description of the soil behaviour. It was observed a very good agreement between the numeri-cal solution obtained using the HSsmall constitutive model and the monitoring data. On the contrary, the pre-diction computed using the MC model was found to highly underestimate the maximum settlement and to produce a much wider subsidence curve than the empirical ones.
2014
8th European Conference on Numerical Methods in Geotechnical Engineering, NUMGE 2014
Geotechnical Engineering and Engineering Geology
04 Pubblicazione in atti di convegno::04b Atto di convegno in volume
Numerical prediction of tunnelling-induced settlements in coarse-grained soils / Fargnoli, V.; Boldini, D.; Amorosi, Angelo. - STAMPA. - 2:(2014), pp. 827-832. (Intervento presentato al convegno 8th European Conference on Numerical Methods in Geotechnical Engineering, NUMGE 2014 tenutosi a Delft, nld nel 2014).
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/806571
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