Shear Failure in Rock Using Different Constant Normal Load

Abstract

\sc Seildel - Haberfield´s \cite1 work was based on the analysis of the regular triangular asperities and assumed that the asperities were rigid. They used normal stiffness shear stress (CNS) to measure the joint dilatation rate and extended the \sc Ladanyi - Archambault´s \cite2 approach. The aim of this research is to investigate the dependence of the constant normal load (CNL) on the rate of the dilatation. Three points were chosen on the bilinear failure envelope: the first in the first linear part, the second in transition stress, and the third in the second part of the bilinear failure envelope. 12 regular triangular cement mortar specimens were used to carry out this research. These cement mortar specimens were investigated by \sc Tisa - Kovari \cite3 before so all the material and shearing constants were well-known. The other purpose of this research was to observe the influence of the normal stress on the dilatation-displacement curves.