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Effects of the physical characteristics of foams on conditioned soil’s flow behavior: A case study by Nour EL SOUWAISSI; Irini DJERAN-MAIGRE; Laurence BOULANGE; Jean-Luc TROTTIN is a Engineering article available to read on EtoBox.

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Earth pressure balance shield (EPBS) is the excavation technique responding to the technical construction complexity of the future line 16–1 of the Grand Paris Express project. Its principle is based on the capacity of the excavated ground to transmit the forces needed to counterbalance the earth and water pressures of the working face. Additives are injected into the soil; on the cutting wheel, in the excavation chamber and in the screw conveyor. Their role is to assure the soil conditioning by modifying the soil’s workability and its hydromechanical and rheological parameters. Therefore, the soil conditioning produces a plastic medium able to transmit the pressure to maintain the front face. In addition, as a second objective, the additives aim to overcome uncertainties in the soil. Depending on the case, the additives can reduce the clogging, internal friction, abrasiveness, and permeability of the soil. The additives can include water, surfactant, polymer and bentonite. The combination of water and surfactant with or without polymer produces the foam. In order to increase the excavation perfomance, laboratory prelimenary tests are performed to deduce the optimal foam parameters

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Author

Nour EL SOUWAISSI; Irini DJERAN-MAIGRE; Laurence BOULANGE; Jean-Luc TROTTIN

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Engineering (Physical Sciences)