Abstract
Direct shear test and triaxial compressive test were conducted on tuff specimens containing artificial weak planes to investigate the effect of direction and the number of weak planes on the shear strengths and the deformation behavior of rocks. The anistropy of shear strength and dilatancy with respect to weak plane orientations, the influence of number of weak planes on the shear strengths, and the ultimate compressive strength in confining pressure were presented and discussed.
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