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Great Ocean Road, Lorne

Client: VicRoads South East Region
Project Value: $10,500
Site Location: Windy Point, Lorne
Council: Surf Coast Shire Council
BW Services: Survey

Description

VicRoads Geelong (South West Region) pro-actively identified the need to update previous surveys of the rock face along the Great Ocean Road beyond Lorne for potential land slip, appointing Beveridge Williams to undertake the control and monitoring survey.

Affecting the ‘high’ side of the road, the potential for rock slippage poses a danger to users from large boulders and debris. Over the period of VicRoads’ monitoring, different level and co-ordinate datums have been used, a new approach was decided upon.

As expected, rocks had become dislodged, vegetation has grown and access to a number of survey points is difficult unless at low tide with favourable weather. Clambering up and over the rocks with paint and the slasher, all the bolts surviving the harsh conditions were located, the highest nearly 40m above the road surface, itself 20m above the sea rock control points.

With the consent of VicRoads, the locations of new bolts were determined facilitating good coverage of the site and ensuring major (and stable) base rock. Returning to the rock face with cordless drill, marine grade bolts and a can of marine undercoat paint, the bolts were placed and numbered.

Observations for the control then began, multiple faces were read and all observations included distances. A level run was carried out but did not include levelling down to the sea rock and back.

Excellent results and residuals were achieved, providing a basis for on-going monitoring for VicRoads. No working was undertaken at height, we were constantly in touch with the ground.