Managing and validating limited borehole geotechnical information for rock mass characterization purposes – experience in Peruvian practice for open pit mine projects

Author(s): 
Andrés Huaman, Joel Cabrera, Antonio Samaniego
Date: 
Tuesday, April 10, 2018
First presented: 
Slope Stability 2018
Type: 
Published paper
Category: 
Geotechnical
The assessment of rock mass blockiness is fundamental for any geotechnical study, managing and validating geotechnical information is then critical for rock mass characterization purposes, especially when the borehole information is limited or the available cores are disturbed.
This work presents cases in Peruvian practice where managing and validation of logging database was successfully undertaken. The validation procedure included an evaluation of the blockiness and the use of a logging database from different projects to confirm/modify theoretical published bounds that correlate RQD and defect spacing, the work also included a comparative analysis of GSI estimation from data collected from cores, well-known approaches have been considered.
Moreover, blockiness data consistency as well as typical issues on logging activities and analysis are discussed. Special consideration has been given to weak zones and core loss. Typical issues and shortcomings when using/collecting borehole data for rock mass characterization are also highlighted.

Feature Author

Joel Cabrera

Joel is a Mining Engineer with a Master’s degree in Geotechnical Engineering. He has over 15 years of experience in geotechnical engineering for mining projects working in the project design and construction supervision of open-pit and underground mines, mainly related with slope stability works, design of underground excavations, geomechanical evaluation of underground mining methods and mining sequence, tailings and waste storage facilities design in the short, medium and long-term.

Principal Consultant (Geotechnical Engineering)
MSc Geotechnical Engineering
SRK Lima
Antonio Samaniego

Dr. Antonio Samaniego, founder of SVS Ingenieros S.A. (now SRK Peru), is a Civil and Mining Engineer, holds an MSc and a PhD (Rock Mechanics) from Imperial College London, UK. He has more than 30 years of experience in geotechnical engineering, rock mechanics and rock engineering, having worked in different mining and civil engineering projects in Peru, Argentina, Mexico, Colombia, Uruguay and Ecuador. Has specific experience related to underground mining method design, rock support, tunnels, open pit slope stability, waste and tailings deposits design and underground space for mining and civil infrastructure.

Dr. Samaniego has authored technical publications and has been speaker at different Peruvian and international conferences. He is a Competent Person (QP) Mining from IOM3. He has been principal professor on rock mechanics at the Pontificia Universidad Católica del Peru from 1976 to 2016. President of the Instituto de Ingenieros de Minas del Peru from 2014 to 2016 and Vice President for South America of the ISRM from 2011 to 2015.

Corporate Consultant
MSc, PhD, FIMMM, CEng
SRK Lima
SRK Africa