Updated flowcharts for rock mechanics modelling and rock engineering design

In an earlier paper, the ways ahead for rock engineering design methodologies were discussed. In this paper, following an overview of earlier approaches, we present two updated flowcharts: one for rock mechanics modelling in which the modelling options are outlined; and one for rock engineering design in which the three phases of overall assessment, initial design and final design are incorporated. We outline the steps necessary and the principles involved in utilising the flowcharts, especially the appropriateness of the modelling methods for different circumstances together with the integration of methods. Particular emphasis is placed on the cycling through feedback and final design. We demonstrate the procedure with three illustrative case study examples representing the range of complexity: a conventional tunnel, the design and construction of the underground powerhouse for the Shuibuya hydro-electric project in Hubei Province, China, and designing a radioactive waste repository. The first and third case examples are presented briefly: the first because of its relative simplicity; the third because of its relative complexity. The second case of the powerhouse design and construction is presented at greater length because it clearly illustrates the application of the flowcharts.