Taylor's Chart

SLOPE STABILITY ANALYSIS FOR OPEN PITSJosé L. Carvalho Golder Associates Ltd., Mississauga, CANADA1.0 INTRODUCTIONIn the process of wall design for open pits, a number of steps and levels of analyses are required, fromlocal bench design to overall stability of the walls, to evaluation of the design performance andcalibration of parameters through back-analysis. This process requires the use of a variety of methodsof analysis and software ranging from limit equilibrium methods to more involved numerical analysessuch as distinct elements, which can capture detailed geology and handle mixed failure modes. It isthe aim of this article to present the common methods used in the design and analysis of the differentcomponents of the open pit wall design process.It should be understood that before one gets to the design and analysis stage a considerable amount offield work must already have taken place to provide the necessary data. This data gathering andinterpretation process is extremely important and its quality and thoroughness is usually responsiblefor the success of the design. Some of the more important aspects of this preliminary work are asfollows.• Regional geology, regional faulting and emplacement of the ore are important factors andusually define the different lithological and structural domains in the pit.• Hydrogeology and understanding of the groundwater flow regime impact overall stability.• Structural mapping of the different domains and rock types control both bench design andoverall stability. This includes both joint sets as well as major features such as dykes, faults,contacts, etc.• Identification of alteration zones within the pit is important. Alteration affects rock strength,therefore, different alterations within the same rock type should be grouped separately.• Laboratory testing of the different rock types with the results grouped by alteration for eachrock type.

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