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Z X (b) List three factors that increase compressive strength of intact rock material in laboratory testing: (c) List two factors that influence the stress distribution around a circular tunnel. (3) (2) 5 (d) Plot the possible Shear strength versus Normal stress graph as a result of shear testing of a discontinuity with the roughness profile shown in the following sketch? (Assume no cohesion) (2) on ? (e) A rock sample is unloaded at A with the unloading path shown during a UCS test. Plot the path if reloading takes place at point B? B A (2)