The variations of strength properties of rock shear tests are significantly large because of the discontinuous nature of rock masses and the accuracy of loading control. For the purpose of clarifying the latter reason, in this study, the rotation angles of the concrete block of failure about horizontal axis af and about the vertical axis ßf, the horizontal displacement perpendicular to the shear direction lf are investigated. As a result, the average values (af, av, ßf, av, (lf / hf)av)= (0.5°, 4.9°, 0.2). The standard deviations (sa, sß,, sl,) = (±12.2°, ±5.6°, ±0.3). Furthermore Shear stress ratio? tf/tff is decreased especially in the case af< 0.

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