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Effect of the intermediate principal stress on the failure of a foliated anisotropic rock
| Content Provider | Scilit |
|---|---|
| Author | Kwaśniewski, M. Mogi, K. |
| Copyright Year | 2020 |
| Description | Book Name: Mechanics of Jointed and Faulted Rock |
| Abstract | Some cuboidal specimens of a foliated green crystalline Chichibu schist were tested in the conditions of true triaxial homogeneous state of compressive stresses. The specimens had been cut out from large blocks in such a way that their vertical axis (coinciding with the direction of the maximum principal stress $(σ_{1}$) was oriented perpendicularly to the planes of foliation (β = 90° — direction of the highest compressive strength), or at angle β = 30° (direction of the lowest compressive strength). In the latter case, the specimens were prepared so that the angle (ω) between the direction of the intermediate principal stress $(σ_{2}$) and the strike of the plane of foliation was 90°, 45° or 0°. In the tests carried out at the minimum principal stress $(σ_{3}$) equal to 50 MPa, and the intermediate one reaching 322 MPa, it has been shown that the effect of the intermediate stress on the strength and deformational features of a layered rock is highly dependent on the orientation of this stress to the planes of weakness. This effect is particularly strong, manifesting itself by a high increase in strength and deformabi1ity of the rock, in the case when the intermediate stress is oriented perpendicularly to the strike of the planes of weakness (ω = = 90°). When the direction of the intermediate stress is parallel to the planes of weakness (ω = 0°), the increasing of this stress results in a small decrease in deformability of the foliated rock, and has moderate (for β = 90°) or no effect (for β = 30°) on its strength. It has also been shown that the specimens of the orientations β/ω = 30°/90°, 45° and 0° underwent faulting in the plane(s) of weakness. The fracture angle (θ) was therefore the same as angle β, and the orientation of the fault plane towards the $σ_{2}$ direction was determined by the angle ω. And thus, in the case of specimens with β/ω = 30°/90°, the fault planes were parallel not to the direction of the intermediate stress (as in the case of isotropic rocks), but to the direction of the minimum stress. |
| Related Links | https://api.taylorfrancis.com/content/chapters/edit/download?identifierName=doi&identifierValue=10.1201/9781003078975-57&type=chapterpdf |
| Ending Page | 416 |
| Page Count | 10 |
| Starting Page | 407 |
| DOI | 10.1201/9781003078975-57 |
| Language | English |
| Publisher | Informa UK Limited |
| Publisher Date | 2020-11-24 |
| Access Restriction | Open |
| Subject Keyword | Book Name: Mechanics of Jointed and Faulted Rock Microscopic Research Foliated Rock Orientation Planes Intermediate Stress Principal Stress Compressive Fault |
| Content Type | Text |
| Resource Type | Chapter |
