The RTA Guide To Slope Risk Analysis Version 3.1

I.E. Stewart, F.J. Baynes and I.K. Lee

The RTA Guide to Slope Risk Analysis presents a procedure for analysing geotechnical risks associated with slopes adjacent to main roads in NSW. The procedure analyses the risk associated with actual or potential failure mechanisms which have been identified for a slope, using a series of defined ratings, which are combined through a risk matrix to generate an Assessed Risk Level (ARL) for the slope. The ratings are correlated to conditional probabilities for the likelihood and consequences of failure. Risk to life and economic risk are both analysed. Some of the methods used to allocated the ratings are presented. The inherent limits to the precision of risk analysis procedures are also discussed.