A simplified analytical model for predicting the shear behaviour of regular triangular rock/concrete joints under constant normal stiffness

Abstract

In developing a shear strength model for rock joints, it is essential to understand the shear behaviour of idealised elastic asperities. In this paper, the shear behaviour of regular triangular elastic asperities subjected to constant normal stiffness (CNS) boundary conditions is examined for a range of Young's moduli of the rock. The results show that dilation of the joint decreases with a decrease in rock Young's modulus, because of the increased elastic deformation of asperities. Finally, a simplified analytical model for predicting the peak shear strength of regular triangular concrete/rock joints is developed, incorporating a non-dimensional equation for joint normal stiffness.