A tunnel is designed to pass under a mountain at great depth. It will intersect a joint plane with the same strike as the tunnel alignment. There is an induced shear in the rock. The calculated stress conditions and the measured joint geometry shown below. Ov = 5.2 MPa, on = 2.8 MPa, Joint angle 15 (clockwise from horizontal) = a. Draw the Mohr's Circle. (4%) b. Plot the Pole. (4%) c. Estimate the maximum positive shear stress. (4%) d. Estimate stress conditions on the joint plane. (4%)