Failure in Confined Brazilian Tests on Sandstone
Source abstract
Abstract
Strength of rocks in the confined tension region, where the minimum principal stress is tensile, has only infrequently been measured and is not well understood. Quasi-static confined Brazilian tests under a range of confining stresses (2.76 to 27.58 MPa) where used to determine the strength of sandstone in the confined tension region. The test results indicate that the strength in the confined tension region was a strong function of the intermediate principal stress: increasing the intermediate principal stress significantly increased the strength of the sandstone. The strength data were well fit by the Mogi–Coulomb criterion, which accounts for the intermediate principal stress. Unconfined Brazilian strength data were not well fit to the Mogi–Coulomb criterion derived from the confined Brazilian test data, consistent with a transition from tensile to shear processes dominating failure with increasing confining pressure. Observations of post-failure fracture surfaces reveal more indication of shear processes with increasing confining pressure. Numerical simulations from combined finite-discrete element method are compared to the experimental results and reflect similar conditions for failure compared to the experimental tests in the confined tension region.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Rock Mechanics and Modeling · Drilling and Well Engineering · Geotechnical Engineering and Underground Structures
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Department of Civil, Construction & Environmental Engineering, University of New Mexico, Albuquerque, NM 87131, USA
Los Alamos National Laboratory, Los Alamos, NM 87545, USA
Funding
Los Alamos National Laboratory · New Mexico Consortium
References (33)
Show source-provided references
1. Hybrid Fracture and the Transition from Extension Fracture to Shear Fracture10.1038/nature02333 ↗
2. A New Rock Strength Criterion from Microcracking Mechanisms Which Provides Theoretical Evidence of Hybrid Failure10.1007/s00603-016-1083-0 ↗
3. Universal Confined Tensile Strength of Intact Rock10.1038/s41598-019-42698-6 ↗
4. Application of Flattened Brazilian Test to Investigate Rocks Under Confined Extension10.1007/s00603-018-1559-1 ↗
5. Effects of intermediate principal stress on tensile strength of rocks10.1007/s10704-013-9829-0 ↗
6. Fracture Initiation and Propagation in Intact Rock—A Review10.1016/j.jrmge.2014.06.001 ↗
7. A Review of the Tensile Strength of Rock: Concepts and Testing10.1007/s10706-014-9732-0 ↗
8. Empirical Strength Criterion for Rock Masses10.1061/AJGEB6.0001029 ↗
9. Brittle Failure of Rock: A Review and General Linear Criterion10.1016/j.jsg.2018.04.007 ↗
10. Bobich, J. (2005). Experimental Analysis of the Extension to Shear Fracture Transition in Berea Sandstone. [Master’s Thesis, Texas A&M University].
11. Judd, W.R. (1964). Brittle Failure of Rock. State of Stress in the Earth’s Crust, Elsevier. [1st ed.].
12. Effect of the Intermediate Principal Stress on Rock Failure10.1029/JZ072i020p05117 ↗
13. Rock Failure under the Confined Brazilian Test10.1029/JZ071i010p02651 ↗
14. Yawei, L., and Ghassemi, A. (2018). Rock Failure Behavior and Brittleness under the Confined Brazilian Test. 52nd U.S. Rock Mechanics/Geomechanics Symposium, American Rock Mechanics Association.
15. Boyce, S.H., Rougier, E., Knight, E.E., Reda Taha, M.M., and Stormont, J.C. (2021). Experimental Study correlating damage and permeability in concrete using confined, flattened Brazilian disks. Int. J. Damage Mech.10.1177/1056789521998726 ↗
16. ASTM D2938 (2010). Standard Test Method for Unconfined Compressive Strength of Intact Rock Core Specimens, ASTM International. Available online: www.astm.org.
17. ASTM D3967 (2010). Standard Test Method for Splitting Tensile Strength of Intact Rock Core Specimens, ASTM International. Available online: www.astm.org.
18. The Flattened Brazilian Disc Specimen Used for Testing Elastic Modulus, Tensile Strength and Fracture Toughness of Brittle Rocks: Analytical and Numerical Results10.1016/S1365-1609(03)00093-5 ↗
19. ASTM C496 (2010). Standard Test Method for Splitting Tensile Strength of Cylindrical Concrete Specimens, ASTM International. Available online: www.astm.org.
20. The Evaluation of Poisson’s Ratio and the Modulus of Materials of a Low Tensile Resistance by the Brazilian (Indirect Tensile) Test with Particular Reference to Concrete
21. HOSS: An Implementation of the Combined Finite-Discrete Element Method10.1007/s40571-020-00349-y ↗
22. Munjiza, A. (2004). The Combined Finite-Discrete Element Method, John Wiley and Sons.10.1002/0470020180 ↗
23. Munjiza, A., Knight, E.E., and Rougier, E. (2012). Computational Mechanics of Discontinua, John Wiley and Sons. [1st ed.].10.1002/9781119971160 ↗
24. Munjiza, A., Rougier, E., and Knight, E.E. (2015). Large Strain Finite Element Method: A Practical Course, John Wiley and Sons. [1st ed.].
25. Validation of a Three-Dimensional Finite-Discrete Element Method Using Experimental Results of the Split Hopkinson Pressure Bar Test10.1016/j.ijrmms.2014.03.011 ↗
26. Simulation of Fracture Coalescence in Granite via the Combined Finite-Discrete Element Method10.1007/s00603-019-01773-0 ↗
27. Numerical Analysis of Flyer Plate Experiments in Granite via the Combined Finite-Discrete Element Method10.1007/s40571-019-00300-w ↗
28. Simulation of Mixed-Mode Fracture Using the Combined Finite-Discrete Element Method10.1007/s40571-020-00341-6 ↗
29. Experimental, Numerical and Analytical Studies on Tensile Strength of Rocks10.1016/j.ijrmms.2011.11.007 ↗
30. Song, Z., Li, M., Yin, G., Ranjith, P., Zhang, D., and Liu, C. (2018). Effect of Intermediate Principal Stress on the Strength, Deformation, and Permeability of Sandstone. Energies, 11.10.3390/en11102694 ↗
31. An Analytical Solution to Wellbore Stability Using Mogi-Coulomb Failure Criterion10.1016/j.jrmge.2019.03.004 ↗
32. Crack Initiation Stress in Low Porosity Crystalline and Sedimentary Rocks10.1016/j.enggeo.2012.12.007 ↗
33. Crack growth and development during creep of Barre granite10.1016/0148-9062(79)90772-1 ↗