Comparison of Fragmentation Measurements by Photographic and Image Analysis Techniques

摘要

Fragmentation measurements of ten samples were carried out using a manual (photographic) and two image analysis systems. The photographic method was slow and the automatic netting facilities available with the image processing and analysis systems were not sufficient and required manual editing to improve the fidelity of the netting. The fragmentation results from three methods did not agree for individual samples. When merged, WipFrag and manual analysis produced nearly identical distributions but the Fragalyst results deviated significantly. The merged results were uniform and hence, the merging of several individual images for the same blast should be done to get the distribution of the entire muck pile. The Rosin-Rammler curves fitted to the merged distributions showed close agreement between the two in case of manual and WipFrag analyses. The curve deviated remarkably in case of Fragalyst, which appears to have underestimated the fines. Further improvement should be done to overcome the present limitations to make image analysis a practical tool for rock blasting.