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The Biel autobahn ring closes one of the last gaps in the Swiss autobahn network, and the east branch of this ring requires two twin‐bore tunnels in difficult and variable geology. All four tunnel bores are being driven by an earth pressure machine with 12.6 m diameter. Right at the start of the tunnel section, the route passes under a canton road and the main line of the Swiss federal railways SBB...
The subject of this article based on the Kaiser Wilhelm Tunnel is the derivation of a list of criteria for overcoming critical situations during tunnelling at the borderline of open mode to closed mode operation. The consistent application of this list of criteria demonstrates, that with knowledge of the sensitive interaction of machine and surrounding ground, the scope of application of current machine...
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