Remediation of a hazardous legacy slope face using pre-split blasting
Effective engineering characterization of granites altered through processes of kaolinization is critical for safe extraction and design of slopes for the china clay industry in south-west England. This case example describes the remediation undertaken to alleviate the significant hazard associated with a 26m high legacy slope within an operating china clay pit. Remote rock mass characterization of the hazardous slope was undertaken using terrestrial laser scanning from numerous set-up locations to provide geo-spatial data for blast design, kinematic analysis and subsequent instability analyses. The trial pre-split blast resulted in a reduced overall slope angle and sufficient space for design of a suitable rocktrap, thereby reducing the risk to acceptable levels when following a Rockfall Hazard Appraisal System (RHAS). The trial also provided useful guidelines for future use of the technique, particularly for implementation when considering controlled blasting when approaching final pit wall limits.
European Commission under the 7th Framework Programme
Eurock2015: 64th Geomechanics Colloquium, Salzburg, Austria, 7-10 October 2015
Eurock2015: 64th Geomechanics Colloquium