Road Cutting Stability And the walls came tumbling down. (Def Lepard, 1982) D.Turner March 2002.

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Presentation transcript:

Road Cutting Stability And the walls came tumbling down. (Def Lepard, 1982) D.Turner March 2002

West portal of the Penmaenmawr A55 Road tunnel, N.Wales West portal scree rhyolite

Gabion walls

Shotcrete ( sprayed concrete ) Pattern bolting

rock anchors steeply dipping beds

Cross-section

Rock anchors dental masonry

Wire netting Why use this rather than rock anchors? free face composed of shales and minor sandstones soft, friable shales difficult to support with single anchor point netting anchored to harder, more competent sandstone units

Concrete Sea Wall at Robin Hood’s Bay

Retaining & rock-fall walls Pattern bolting scree slope Concrete tunnel lining Roadside rock- fall barrier View of west portal

Unsupported limestone beds dipping steeply towards the road Vassaliki, Greece

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