Loncaric, AJ, Loomes, A, Lett, J & Emmi, J 2009, 'Control and measurement of shotcrete thickness', in PM Dight (ed.), Proceedings of the First International Seminar on Safe and Rapid Development Mining
, Australian Centre for Geomechanics, Perth, pp. 101-110.
The Australian mining industry uses approximately 500,000 m3 of shotcrete for ground support per year at a
cost of around 12–15% of the total development cost. Shotcrete thickness is a key parameter for ensuring
that the lining will meet design specifications and also for controlling usage and cost. The minimum
thickness is usually specified and measured as part of the mine quality assurance program. This generally
involves using a depth indicator, depth stamp on the wet shotcrete, or drilling and measuring thickness at
selected points. These methods collect point data and do not allow for detailed measurements of thickness
across the full profile. This paper presents and discusses trials conducted at Ridgeway Mine to measure
shotcrete thickness using depth indicators, laser scanners and photogrammetry. The trials demonstrate the
benefits of using laser scanning and photogrammetric techniques for obtaining detailed rock profiles and
shotcrete thickness profiles. Laser scanning techniques can also be aligned with the mine survey grid
enabling rapid and accurate survey of development headings as part of the shotcrete quality
assurance/quality control (QA/QC) function.
Faro Technologies (2009) Florida, USA, viewed 13 March 2009,
Riegl Laser Measurement Systems (2009) Horn, Austria, viewed 13 March 2009,