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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50 MPa Oc ON tan ф 20 + + -20 MPa 50 MPа 100 MPа O = 90 –20 -50 MPа