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As part of the four‐track improvement of the Zurich‐Berne line near Aarau, the 3.1 km long Eppenberg Tunnel was bored using a multi‐mode TBM. This involved driving more than 700 m in highly permeable soils, mostly above the groundwater table. The hydroshield drive was confronted with considerable problems. The static yield point of the bentonite slurry repeatedly fell below the critical limit of 10...
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