Abstract
The mechanical behavior of saturated model rock mass with a clayey seam was investigated by conducting a series of undrained triaxial compression tests. In the tests, a rock mass was modeled by a specimen made by sandwiching an alluvial clay seam between two pieces of Ohya-stone (tuff). The effects of the thickness of clayey seam, the inclination of seam plane to the maximum principal stress direction, the shear strain rate, the confining pressure and the over-consolidation ratio on the mechanical behavior of rock mass were studied based on the effective strees concept. From the experimental results, even if the thickness of clayey seam was so thin, the shear strength of rock mass is found to be governed by that of the clayey seam.
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