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- Title
Rock Mass Characterization by High-Resolution Sonic and GSI Borehole Logging.
- Authors
Agliardi, F.; Sapigni, M.; Crosta, G.
- Abstract
We investigate the relationships between the in situ P-wave velocity (Vp) of rock masses, measured by borehole acoustic logging, and their Geological Strength Index (GSI), to support a reliable assessment of equivalent continuum rock mass properties at depth. We quantified both Vp and GSI in three deep boreholes drilled in a crystalline core complex of the central Italian Alps. The boreholes were driven up to 400 m in depth and provided high-quality drill cores in gneiss, schist and metasedimentary rocks with variable lithology. Geological and geomechanical logging was carried out for over 800 m of cores, and acoustic logging was performed for more than 600 m of borehole length. High-resolution core logging in terms of GSI was obtained using an original quantitative approach. Candidate empirical correlation functions linking Vp and GSI were tested by a two-step statistical analysis of the experimental dataset, including outlier removal and nonlinear regression analysis. We propose a sigmoid Vp-GSI equation valid over a depth range between 100 and 400 m. This accounts for extremely variable lithological, weathering and rock mass damage conditions, complementing existing shallow-depth approaches and showing potential for practical applications in different engineering settings.
- Subjects
ROCK mechanics; BOREHOLE logging; P-waves (Seismology); ROCK fatigue; PETROLOGY
- Publication
Rock Mechanics & Rock Engineering, 2016, Vol 49, Issue 11, p4303
- ISSN
0723-2632
- Publication type
Article
- DOI
10.1007/s00603-016-1025-x