Discussion Forum : Mining Engineering
Question - The uniaxial compressive strength of a limestone sample is 80 MPa. The sample is confined at a
pressure of 20 MPa in a triaxial compressive strength test. Based on Hoek-Brown failure criteria
the maximum principal stress at failure in MPa is (consider rock constants as m = 7.88, s = 1.0 and a = 0.5)
Options:
A .  117.9
B .  132.3
C .  137.9
D .  157.9
Answer: Option D


-NA-



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