An Analytical Model to Predict Shear Stress Distribution in Fully Encapsulated Rock Bolts

Abstract

This study proposes a new analytical model to predict shear stress in a fully encapsulated rock bolt in jointed rocks. The main characteristics of the analytical model consider the bolt profile and jump plane under pull test conditions. The performance of the proposed analytical model, for different bolt profile configurations, is validated by ANSYS software and field. The results show there is a good agreement between analytical and numerical methods. Studies indicate that the rate of shear stress from the bolt to the rock exponentially decayed. This exponential reduction in shear stress is dependent on the bolt characteristics such as: rib height, rib spacing, rib width and resin thickness, material and joint properties.