A question in GATE 2012 Mining Engineering Paper with Solution has been updated:
A circular tunnel of 1.85 m radius is driven in rock in a hydrostatic stress field of 20 MPa. The tunnel lining is provided before occurrence of any rock deformation. The shear modulus of rock is 2 GPa and the modulus of elasticity of lining material is 3 GPa. Assuming both rock and lining behave elastically, the radial pressure on the rock and lining interface in MPa is
- 13.33
- 9.91
- 8.19
- 11.62
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