ABSTRACT

ABSTRACT: In the domain of Rock Mechanics, most laboratory tests do not simulate the triaxial states of stress that exist in rock masses involved in engineering workings. In fact, a conventional triaxial compression experiment is performed using a lateral confining pressure which is constant in all directions; therefore, only a 2-D state is created. The same thing happens in common shear tests, where a biaxial stress state is obtained, which is far from the field conditions where “in situ” shearing occurs. A description of the hollow cylinder test technique is presented, emphasizing the application of loadings along three surfaces, thus inducing true 3-D states of stress within rock samples. Results obtained using this method are shown and further applications are suggested.