Mining Engineering > GATE 2022 > Rock Mechanics
A circular tunnel of radius 3 m is constructed in a hydrostatic stress field of 15 MPa. The modulus of elasticity and Poisson's ratio of the rock are 5 GPa and 0.25, respectively. A uniform support pressure pi is applied at tunnel boundary to restrict the radial deformation at the tunnel boundary to 4 mm. The value of pi in MPa is __________. (round off to two decimal places)

Correct : 9.50

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