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List of products by author: Z. Zizka
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Analysis of Slurry Pressure Transfer on the Tunnel Face during Excavation
Abstract: Slurry shields represent a well-proven technology, and are usually employed for excavations in soft soils with unstable tunnel face due to the possibility to support the tunnel face actively with pressurized slurry (bentonite suspension). Two key conditions have to be fulfilled in order to achieve a stabilized tunnel face. The first condition is defined by a sufficient slurry pressure in the...
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Recommendations for Efficient Face Support in Slurry Shield Tunnelling
Abstract: In slurry shield tunnelling, a reliable face support is presumed if a support pressure is transferred and the slurry excess pressure provides efficient support pressure on the soil skeleton. To ensure face stability, the support pressure transfer needs to be provided within the theoretical sliding wedge after Horn (1961) at the tunnel face. Therefore, the penetration depth of the bentonite...
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Route selection for a railway tunnel in the centre of Prague
Abstract: Railway tunnel Dejvice – Veleslavin is a part of a wider railway upgrade scheme linking the city centre of Prague and all three Prague metro lines with Vaclav Havel airport Prague and the city of Kladno. This paper maps the bumpy route to the selection of the preferred railway alignment option which started in 1999. The objectives of this paper are to describe changes in people’s perception of...
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