Technologies and tools have been developed to account for rock mass characteristics, fragmentation, blast damage and vibration. Further development of the measuring procedures defined in the first part of the project to characterize pre-blast rock mass characteristics have been carried out. This includes Measuring-while-drilling (MWD) data in four sites, measurements of the high wall with photogrammetry and LiDAR data of the block face, and in-hole photography of the blasthole walls with optical televiewer. Damage to the remaining rock is determined from televiewer and close range acceleration measurements; the latter used to calibrate a full-field near-field seismic radiation model.
Different techniques, like in situ and lab sieving combined with analysis of images taken by Unmanned Aerial Vehicles Systems (UAV) and terrestrial laser scanning, have been applied to measure fragmentation from blasting. A numerical procedure to calibrate the Ignition and Growth equation of state (EoS) for three emulsion explosives has been developed. This EoS that takes into account non-ideal detonation regime has been considered to model in LS-Dyna the performance of these explosives in a wide range of conditions. A procedure to measure detonation pressure of explosives in controlled (laboratory) and production environments (mine) have been developed. The parameters that govern the production of toxic fumes from blasting have been studied and guidelines to reduce the production of toxic fumes are provided.
Three major topics have been covered on environmental impact and safety: vibration from blasting in the near and far field, airborne particulate matter, and the application of lining while charging in open pit mines. 2D and 3D numerical (LS-DYNA) models of single and multiple holes have been developed to model the near-seismic field, aiming at building damage plots of the remaining rock mass. A semi-analytical model has been developed and calibrated to assess velocity and acceleration fields in near seismic field. Based on these data, a procedure to calculate the stress field and evaluate the extent of damage in the rock from these radiation patterns is also provided.
A far-field seismic model has been built for the sub-surface of Erzberg mine. Dust emission factors (EF) for mucking and blasting have been quantified. Solutions to control dust production in blasting have been implemented and evaluated. A prototype for a lining while charging device to reduce nitrates leaching has been developed.
A new explosive formulation, RIOMEX 10000 DS emulsion has been developed and tested.
A new concept for the characterization of blasting results by analysis of UAV-borne images has been developed. Experiments in real and laboratory scale have been done to optimize image acquisition.
A new software application for designing surface blasts has been developed.
Validation trials have been carried out in two mines to assess the tools and working procedures developed in the project to characterize pre-blast rock conditions, blast geometry, explosive performance and blast results. A compendium of best practices and lessons learned throughout the validation phase, including a data portfolio have been prepared.
A life cycle assessment has been done that quantifies all relevant emissions and resources consumed and the related environmental and health impacts and resource depletion issues.
A SLIM Checklist for Exploitation has been used in a similar way as the EC’s Innovation Radar Questionnaire.
Dissemination of the project activities and results has been done through numerous poster and oral presentations in conferences and workshops, project website and social media representations. Two videos have been produced. Workshops with local communities and stakeholders have been organized.
Best practices on social awareness communication and guidelines for local communities have been elaborated.
