Tensile strength and its anisotropy
Abstract
The set of TBM performance data shown in Figure 21 from Klein et al. (1995) indicates the important role of the tensile strength (expressed as point load index I 50 ). Specifically, a low ratio of UCS/ I 50 gives low penetration rates (higher FPI), i.e. when the tensile strength is higher in relation to σ c (or UCS) compared to the common ISRM conversion factor σ c / I 50 ≈ 24 (for 50 mm diameter core).
Fields of Study & Subjects
Tunneling and Rock Mechanics
Rock Mechanics and Modeling
Geotechnical Engineering and Soil Mechanics
Publication details
- Journal / source
- CRC Press eBooks
- Pages
- 28–29
- Publication date
- 19 January 2026
- Language
- EN
- Document type
- Book chapter