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BC Update 161: Cantilever timber pole retaining wall revised - Worked example 1

Posted: 22 July 2014

BC Update
Revised 'Worked example 1 - Cantilever timber pole retaining wall' includes considerations and clarifications on bending failure and calculations, and forms part of the guidance on Seismic design of retaining structures for Canterbury.

This Building Controls Update is a periodic news bulletin for the building sector.

The 'Worked example 1 - Cantilever timber pole retaining wall' has been re-issued. 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.

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'.

There are a number of methods to design a cantilever timber pole retaining wall and this worked example presents the simplified gross pressure limit equilibrium method. A discussion on the various design methods ‘Embedded retaining walls – a guide to economic design C580 (2003)' is available to purchase on the CIRIA website.

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

This information is published by the Ministry of Business, Innovation and Employment’s Chief Executive. It is a general guide only and, if used, does not relieve any person of the obligation to consider any matter to which the information relates according to the circumstances of the particular case. Expert advice may be required in specific circumstances. Where this information relates to assisting people: