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Here is a built tunnel that might have been used as guide and perhaps led to too optimistic conclusions. Fahrlachtunnel Mannheim: <a href="http://www.daub-ita.de/en/tunnel-projects/deutschland/fahrlachtunnel-mannheim/">http://www.daub-ita.de/en/tunnel-projects/deutschland/fahrlachtunnel-mannheim/</a> Here we have an ice ring with a tunnel built with miner's method as specific proposal. Ironically the owners proposal was using a TBM. The tunnel crosses a railyard and mainlines carrying freight and passenger traffic. Differences: Soil coverage minimum 23' instead of 13', much less rail traffic, no pedestrian underpass cutting into the ice ring, no special frost-proof grout needed. I haven't found anything about the influence of vibrations on the freezing process, not temperatures but on tensile strength. Perhaps someones knows something? Regards, Volker
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