Abstract
In in-situ block shear tests, shear stress-shear displacement curve, shear stress-normal displacement curve etc. are usually obtained. Because characteristic points in these curves are not always distinct except failure point, it is difficult to estimate shear strength of rock mass for designing rock structure only from these curves. From these points of view, it is attempted to estimate shear strength in both in-situ block shear test and laboratory direct shear test by monitoring AE (Acoustic Emission). Consequently, it is found that shear strength which is estimated by monitoring AE in in-situ block shear test takes a lower value, and shear strength estimated by monitoring AE in laboratory direct shear test takes a higher value than peak shear strength obtained in in-situ block shear test. Also, shear strength estimated by monitoring AE in in-situ block shear test shows a tendency to be nearly equal to residual shear strength obtained in laboratory direct shear test.
