NZGS Slope Stability Guidance – Draft For Comment

In response to demand from our members, a sub-committee of the New Zealand Geotechnical Society has been developing slope stability guidance for use in New Zealand. It is now ready in draft, and we will soon be asking for feedback from our members to help us finalise this unit. The feedback will open in January and run through until March – an announcement will be made to members once feedback is open.

The purpose of the guideline is to provide technical and practical guidance to geoprofessionals (engineers, engineering geologists, and other professionals involved in assessing and managing the stability of slopes) in a New Zealand context.

The guidelines are not intended to describe cutting edge / advanced practice, but to help ensure that slope stability assessments are performed in a competent manner, using established good practices and current technical knowledge. Almost all the content of Unit 1 is derived from existing literature, and sources are referred to as appropriate so that users can refer to the original publications.

This document will be the first in a series of more detailed units describing good practice for assessing and managing slopes in New Zealand, and will sit alongside the Earthquake Geotechnical Engineering Modules as additional guidance. There will be a degree of linkage between the two series in Unit 3 (Slope Stability Analysis; still to be developed). Users are assumed to be qualified, practicing geotechnical professionals with sufficient experience and knowledge to apply professional judgement in interpreting and applying the recommendations that they contain.

This document will be the first in a series of more details units describing good practice for slopes in New Zealand, and will sit alongside the Earthquake Geotechnical Engineering Modules as equivalent guidance. There will be a degree of linkage between the two series in Unit 7 & 8 (still to be developed).

Our thanks go to the Toka Tū Ake EQC for their support in developing this document, and the authors for their time and effort getting it to this stage (Richard Justice, Don Macfarlane, Ann Williams, Eleni Gkeli, Ross Roberts, John Scott, Kiran Saligame, Nick Peters, Steve Crawford, Naomi Norris, David Stewart, Clive Anderson and Alan Wightman).

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