Influence of the continuously increasing normal stress to the failure in case of shearing test

Vásárhelyi, Balázs and Ván, Péter (2002) Influence of the continuously increasing normal stress to the failure in case of shearing test. In: Mining and tunnelling innovation and oppurtunity: Proceedings of the 5th North American Rock Mechanics Symposium and the 17th Tunnelling Association of Canada Conference (NARMS-TAC 2002). University of Toronto, Toronto, pp. 443-446. ISBN 0 7727 6708 4

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Abstract

In a conventional shearing test the normal force or the normal stiffness is kept constant during the experiment. Sliding under constant normal load occurs in slopes if the environment is not changing during the process. The goal of this paper is to investigate the influence of the continuously changing (i.e. increasing) normal load for the increasing shearing load. Regular triangular cement mortar specimens were used to carry out this research. Both the geometry of the specimens and the mechanical constants were well-known. The "Continuous Failure State" (CFS) shear tests were carried out like the ISRM standardized CFS- triaxial tests, with different starting normal stresses. The differences between the analogous CFS triaxial results are discussed and analyzed. Linear and nonlinear theoretical models are proposed.

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