Structural mapping

This chapter provides a framework for structural mapping and the first pass stability analysis of slopes. A framework for structural mapping and modelling would generally incorporate the following steps: (1) Define the objectives of the stability analysis; (2) Gathering data, including images acquired in the field; (3) Use software such as Sirovision^TM to generate 3D images from the images collected in the field; (4) Digitally map the joints using software such as Sirovision^TM, analyse joint distribution and produce statistics; (5) Perform a first pass stability analysis using this discontinuity data to a stability modelling software such as Siromodel.

The Sirovision^TM system has been developed by CSIRO and is used to measure and analyse discontinuities in a rock mass. This system is based on a photogrammetric technique that allows 3D images to be constructed from 2D images captured with a digital camera. Structures can be mapped from these images quickly and safely, with no need to approach a potentially unstable highwall.

The Siromodel system has been developed by CSIRO as one part of the large open pit mine slope stability project. It allows first pass stability analyses to be performed based on discrete fracture network representations of the discontinuities in a rock mass.