Control and measurement of shoterete thickness

摘要

The Australian mining industry uses approximately 500,000 m~3 of shoterete for ground support per year at a cost of around 12-15% of the total development cost. Shoterete 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 shoterete, 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 shoterete 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 shoterete 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 shoterete quality assurance/quality control (QA/QC) function.