Understanding strength, deformability, stress state and rock breakage

Abstract

This paper introduces a new failure criterion for rocks, addressing the limitations of traditional unconfined compressive strength (UCS) testing and its associated parameters. Our research explores the mechanisms of rock breakage under compressive loads, highlighting the formation of tension fractures and the significant role of friction in stress distribution. We propose a revised interpretation of the stress-strain curve and emphasize the need for direct tensile testing to achieve more precise measurements of tensile strength and elastic modulus. By presenting a novel failure criterion that accounts for these factors, this study aims to enhance the reliability of rock strength assessments, ultimately improving the safety and stability of underground engineering projects.