Loading...
Please wait, while we are loading the content...
Similar Documents
Mechanics of rock fracturing around boreholes
| Content Provider | Scilit |
|---|---|
| Author | Haimson, Bezalel Song, Insun |
| Copyright Year | 2018 |
| Description | Experiments in which borehole breakouts were produced in different rocks have revealed three major mechanisms of rock fracturing. In all tests a true triaxial stress condition was applied to cubical rock specimens. Then a central vertical borehole was drilled, which induced borehole-breakout failure, depending on the magnitudes of the far-field stresses. In crystalline granite intra- and trans-granular dilatant microcracking subparallel to the borehole wall and to the direction of the maximum horizontal stress $σ_{H}$ preceded the development of breakout failure, resulting in 'V'-shaped failed zones along the $σ_{h}$ spring line. In well-consolidated sandstone breakout failure took a similar 'V' final shape. However, microcracks preceding failure were mainly intergranular, and only occasionally intragranular. In a less consolidated but still competent sandstone, failure did occur at the same locations as with the other rock types but, surprisingly, the final breakout shape was a narrow linear fracture perpendicular to $σ_{H}$ direction. The mechanism of this failure mode appears to be largely matrix non-dilatational disintegration leading to grain disaggregation. Book Name: Mechanics of Jointed and Faulted Rock |
| Related Links | https://content.taylorfrancis.com/books/download?dac=C2010-0-32596-0&isbn=9780203747810&doi=10.1201/9780203747810-48&format=pdf |
| Ending Page | 330 |
| Page Count | 6 |
| Starting Page | 325 |
| DOI | 10.1201/9780203747810-48 |
| Language | English |
| Publisher | Informa UK Limited |
| Publisher Date | 2018-04-27 |
| Access Restriction | Open |
| Subject Keyword | Book Name: Mechanics of Jointed and Faulted Rock Mining and Mineral Processing Breakout Failure |
| Content Type | Text |
| Resource Type | Chapter |
