In the process, the tunnel face is stabilized by the support pressure of a bentonite suspension counterbalancing the earth pressure and groundwater pressure. The project aims to describe the time-dependent processes at the fluid supported tunnel face during the transfer of the support pressure under simultaneous soil excavation. 2 Local Transient Face Support within Hydro Shields Furthermore, a new conditioning agent will be developed to extend the application range to EPB shields in very coarse soils and rock. In further investigations, a path-regulated test device will be developed for evaluation of rheological parameters. In a first step, a force-controlled device was developed ( Fig. 1, right) based on the method of the Kelly ball test in concrete technology and the fall cone test in soil mechanics. Since the slump test is not suitable for examining coarse-grained gravelly or purely cohesive soils, a new penetration test was developed to examine the workability of all kinds of soil mixtures and conditioning agents. In the laboratory as well as at the construction site, the slump test is an adequate and internationally used test method to investigate the workability of soil-foam mixtures.
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