Measurements are presented that were performed in the preassure chamber and screw conveyor of an EPB TBM. The TBM operated in saturated sand with a high water table. Foam was applied forsoil conditioning. Different from a slurry shield there was no direct relationbetweenverical the pressure gradient r and the density of the muck in the pressure chamber. The pressure measurements differ considerably for different rings. The density and saturation of the mixture was measured by taking samples from the pressure chamber during excavation. Densities found indicate a porosity just higher than the maximum porosity of the sand. A pressure drop of approximately 1 bar was found when the muck passes from the pressure chamber to the screw conveor. Explanations are presented in the paper.
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