caa a22 4500 605454302 CHVBK 20210128100206.0 cr unu---uuuuu 210128e20151101xx s 000 0 eng 10.1007/s10064-014-0706-5 doi (NATIONALLICENCE)springer-10.1007/s10064-014-0706-5 Managing uncertainty in underground excavation design associated with rock mass characterization using core drilled for mineral exploration [Elektronische Daten] [Renato Macciotta, Graham Parkinson, Eduardo Garcia, Orlando Bravo] Design of underground mining operations, in their preliminary stages, often requires obtaining geomechanical data from re-logged rock core initially drilled for mineral exploration. The degree of alteration of this core due to handling and storage time increases uncertainty in the geotechnical parameters assessed and in the estimated required excavation support. Uncertainty is primarily related to changes in observed joint infill characteristics during storage. This paper presents a simple approach to assess this uncertainty quantitatively, illustrated with a case study in the Peruvian Cordillera. The Q-System was adopted for such assessment and to estimate the required excavation support. From results of the case study presented in this paper, uncertainty associated with the use of stored core was not considered significant when compared to the natural variability of the rock mass. Numerical simulations of excavation geometries for different rock mass qualities were performed to validate estimated support requirements through the Q-System. These simulations required estimations of strength characteristics of the rock mass and discontinuities. These were estimated from measurements in all core available (old and fresh) and considered the uncertainty in the adopted strength envelopes quantitatively. The range of model results and sensitivities to effects of modeling validated the recommended support requirements. During excavation, support requirements would be based on an assessment of Q as the excavation proceeds (an observational approach). Springer-Verlag Berlin Heidelberg, 2014 Underground excavation nationallicence Design nationallicence Parameter uncertainty nationallicence Mining nationallicence Macciotta Renato Department of Civil and Environmental Engineering, University of Alberta, 1-035 Markin/CNRL Natural Resources Engineering Facility, T6G 2W2, Edmonton, AB, Canada aut Parkinson Graham Klohn Crippen Berger Ltd, Vancouver, Canada aut Garcia Eduardo Klohn Crippen Berger Ltd, Lima, Peru aut Bravo Orlando Klohn Crippen Berger Ltd, Lima, Peru aut Bulletin of Engineering Geology and the Environment Springer Berlin Heidelberg 74/4(2015-11-01), 1419-1434 1435-9529 74:4<1419 2015 74 10064 https://doi.org/10.1007/s10064-014-0706-5 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10064-014-0706-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Macciotta Renato Department of Civil and Environmental Engineering, University of Alberta, 1-035 Markin/CNRL Natural Resources Engineering Facility, T6G 2W2, Edmonton, AB, Canada aut NATIONALLICENCE 700 1- Parkinson Graham Klohn Crippen Berger Ltd, Vancouver, Canada aut NATIONALLICENCE 700 1- Garcia Eduardo Klohn Crippen Berger Ltd, Lima, Peru aut NATIONALLICENCE 700 1- Bravo Orlando Klohn Crippen Berger Ltd, Lima, Peru aut NATIONALLICENCE 773 0- Bulletin of Engineering Geology and the Environment Springer Berlin Heidelberg 74/4(2015-11-01), 1419-1434 1435-9529 74:4<1419 2015 74 10064