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M2 Motorway, Sydney
DP provided construction advice and detailed alternative designs to contractor Abigroup Obayashi on many aspects of the M2 Motorway, including the tunnels, bridges, batter stability and retaining walls.
Wall C was a 450m long gravity wall, up to 22m high built from cement stabilised sandstone.
DP had the idea of using cement stabilised sandstone rather than building a conventional reinforced concrete wall. Crushed sandstone was readily available from elsewhere on the project.
A conventional wall would have been more expensive and take much longer to build. The stabilised wall was built in about 8 weeks using conventional earthmoving plant.
As far as is known the wall is the largest and highest yet built of stabilised materials.
Wall C won an ACEA Award of Excellence in 1998
A paper \"Design and Construction of a Cement Stabilised Retaining Wall\" by K. Chandler & M. Palmer was published in 8th ANZ Conference on Geomechanics in Hobart in 1999.
Photographs above show an aerial view of the whole wall and a section. 
