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A55 Penmaenbach Tunnel
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| Estimated cost: | Commencement: | October 01, 1998
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Completion date: | January 01, 2000
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| Location: | United States
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| Technical data: | Two-lane motorway tunnel constructed in 1935. Dims: 9.9m (32.5’) wide x 8.5m (27.9’) high Length: 685m (2,247’) Tunnel supported by rock bolts and shotcrete with final concrete inner lining. Damage Summary: Final lining cracked with areas of water seepage with fines loss through cracks at construction joints. DSC provided technical review services on remedial support measures. |
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| Geology description: | Rhyolite, scree and weathered Rhyolite at ports. |
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