During tunnel excavation with Tunnel Boring Machines (TBMs) and earth pressure balance (EPB) technology, conditioning agents are commonly used to modify the physical and mechanical properties of soils so that they are appropriate for the application of the front-face support pressure during excavation. The consistency of the conditioned soil must be stable during the time necessary to advance and install the lining. Hence, a stability analysis of the injected foams is an important aspect. To assess the stability of a foam a classification is proposed based on the results of a standard foam generation procedure and on half-life tests using products from the main suppliers. A further classification of the foaming agents used according to their ability to produce a stable foam in terms of Foam Expansion Ratio is also proposed.

Classification of foam and foaming products for EPB mechanized tunnelling based on half-life time / Sebastiani, D.; Vilardi, G.; Bavasso, I.; Di Palma, L.; Miliziano, S.. - In: TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY. - ISSN 0886-7798. - 92:(2019), p. 103044. [10.1016/j.tust.2019.103044]

Classification of foam and foaming products for EPB mechanized tunnelling based on half-life time

Sebastiani D.;Vilardi G.;Bavasso I.;Di Palma L.;Miliziano S.
2019

Abstract

During tunnel excavation with Tunnel Boring Machines (TBMs) and earth pressure balance (EPB) technology, conditioning agents are commonly used to modify the physical and mechanical properties of soils so that they are appropriate for the application of the front-face support pressure during excavation. The consistency of the conditioned soil must be stable during the time necessary to advance and install the lining. Hence, a stability analysis of the injected foams is an important aspect. To assess the stability of a foam a classification is proposed based on the results of a standard foam generation procedure and on half-life tests using products from the main suppliers. A further classification of the foaming agents used according to their ability to produce a stable foam in terms of Foam Expansion Ratio is also proposed.
Mechanized tunnelling, TBM-EPB, Soil conditioning, Foaming agents, Foam stability, Half-life test
01 Pubblicazione su rivista::01a Articolo in rivista
Classification of foam and foaming products for EPB mechanized tunnelling based on half-life time / Sebastiani, D.; Vilardi, G.; Bavasso, I.; Di Palma, L.; Miliziano, S.. - In: TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY. - ISSN 0886-7798. - 92:(2019), p. 103044. [10.1016/j.tust.2019.103044]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1304492
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