Worked example 1 – Cantilever timber pole retaining wall revised

The Ministry of Business, Innovation and Employment has re-issued ‘Worked example 1 – Cantilever timber pole retaining wall’. The revised worked example dated 15 July 2014 forms part of the guidance on the seismic design of retaining structures for Canterbury, which supports the guidance ‘Repairing and rebuilding houses affected by the Canterbury earthquakes’. 

The worked example has been revised to include consideration of bending failure of the poles below ground level and to clarify some of the assumptions made in the calculations.

There are several methods to design a cantilever timber pole retaining wall and this worked example presents the simplified gross pressure limit equilibrium method.

Further worked examples for other types of retaining walls are under development.

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Published in building.