The uniaxial compressive strength of a limestone sample is 80 MPa. The – McqOptions

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1.	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)
A.	117.9
B.	132.3
C.	137.9
D.	157.9
Answer» E.

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