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

Road Cutting StabilityRoad 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

rhyolite

Gabion walls

Shotcrete( sprayed concrete )

Pattern bolting

rock anchors steeply

dipping beds

Cross-section

anchors

dental masonry

Wire nettingWhy 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

Pattern bolting

scree slope

Concrete tunnel

liningRoadside rock-

fall barrier

View of west portal

Unsupported limestone beds dipping steeply

towards the road

Vassaliki, Greece

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

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