Assessment of slope stability at building sites
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- Information provider
- BRANZ Limited
- Worley Consultants Ltd
- Information type
- Study report
This report reviews the procedures commonly employed in slope stability assessments in New Zealand at present. The advantages and disadvantages of these procedures are discussed and, where appropriate, recommendations made as to their most suitable application.
The overall approach and individual procedures discussed in this document are relevant to the stability assessment of fill slopes, cut slopes and natural slopes. Greater coverage is given to 'soil' slopes, in view of their predominance in connection with most building works and recognition of the higher incidence of slope failures in these materials. However, procedures that are primarily intended for 'rock' slopes are also discussed in view of the significant implications that rock slope failures may have locally.
Only the technical aspects of a slope stability assessment are dealt with; such matters as liability or insurance are not covered. This document is not intended to fulfil the role of a text book; each topic or procedure is only covered in broad terms except where a more detailed discussion is considered desirable in order to highlight the importance of a particular topic. For the reader who requires elaboration on a particular subjct, a list of references is provided.
The appendices provide additional information to expand on certain topics covered in the main text. Appendix A provides typical costs for various 'levels' of assessment, based on rates charged by consultants in 1986. Appendix B provides background information regarding the types and causes of instability, and Appendix C briefly outlines common remedial and preventative measures.