![]() 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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