Failure in Confined Brazilian Tests on Sandstone

Hagengruber, Tyler; Reda Taha, Mahmoud; Rougier, Esteban; Knight, Earl; Stormont, John

doi:10.3390/app11052285

Failure in Confined Brazilian Tests on Sandstone

Journal Article · Thu Mar 04 00:00:00 EST 2021 · Applied Sciences

DOI:https://doi.org/10.3390/app11052285· OSTI ID:1769440

Hagengruber, Tyler; ; ; Knight, Earl;

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.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: LDRD; USDOE

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 1769440

Alternate ID(s):: OSTI ID: 1807878

Report Number(s):: LA-UR--21-21150; PII: app11052285

Journal Information:: Applied Sciences, Journal Name: Applied Sciences Journal Issue: 5 Vol. 11; ISSN ASPCC7; ISSN 2076-3417

Publisher:: MDPI AGCopyright Statement

Country of Publication:: Switzerland

Language:: English

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