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  Pressure Distribution in the Mixing Chamber of an EBP Shield

  The pressure distribution in the mixing chamber of an EPB shield, operating with foam for soil conditioning, quite often has a left-right asymmetry during drilling. The pressures are higher on the side where the cutter wheel is moving upwards. Recently the same phenomenon was found in computational simulations, but only when compressible muck was modelled. For compressible muck, the centre of gravity is below the tunnel axis and some torque can be applied on the muck before it starts rotating. The paper presents selected measurements and results from numerical calculations from literature and proposes a mathematical model to calculate the centre of gravity of the muck of an EPB shield. The aim of this study is to investigate, if the change of the location of the center of gravity can explain the left/right unbalance. Finally, additional factors affecting this unbalance of the pressure distribution are discussed.

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