Calculating UCS from triaxial stress data A rock specimen indicated the onset of failure in a triaxial test with the following principal and confining stresses. What is the UCS (in MPa) of this rock? σ1= 45 MPa, σ3 = 0.858 MPa σ1= 55 MPa, σ3 = 1.716 MPa σ1= 65 MPa, σ3 = 4.289 MPa

Calculating UCS from triaxial stress data A rock specimen indicated the onset of failure in a triaxial test with the following principal and confining stresses. What is the UCS (in MPa) of this rock? σ1= 45 MPa, σ3 = 0.858 MPa σ1= 55 MPa, σ3 = 1.716 MPa σ1= 65 MPa, σ3 = 4.289 MPa

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter12: Shear Strength Of Soil

Section: Chapter Questions

Problem 12.19P

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Question

Calculating UCS from triaxial stress data

A rock specimen indicated the onset of failure in a triaxial test with the following principal and confining stresses. What is the UCS (in MPa) of this rock?

σ₁= 45 MPa, σ₃ = 0.858 MPa

σ₁= 55 MPa, σ₃ = 1.716 MPa

σ₁= 65 MPa, σ₃ = 4.289 MPa

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A 42mm-diameter intact rock specimen fails in a uniaxial compression test at an axial load of 20 kN. The rock behaves according to the Mohr-Coulomb criterion, with an angle of friction 38 degrees found in the triaxial tests. A specimen of diameter 42mm would fail in a triaxial test with the confining pressure of 10MPa. The values of ??and m in the Hoek-Brown criterion that would give the same failure loads as the Mohr-Coulomb criterion, for the uniaxial and triaxial tests referred to above is respectively ?? 75.14MPa and m 7.76. Calculate by how many percent the Hoek-Brown criterion with ??and m as determined in (c) overestimates or underestimates the axial load at failure compared to Mohr-Coulomb criterion, when the confining pressure is 10MPa and when it is 20MPa.
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ANSWER ASAP PLEASE
50 MPa Oc ON tan ф 20 + + -20 MPa 50 MPа 100 MPа O = 90 –20 -50 MPа