Abstract
Rock shear fracturing occurs frequently in engineering sites, such as underground tunnels and rock slopes. One main factor is that the multiple presence of crack is complicated, especially in terms of crack status. This study aims to investigate the crack status from both crack existence and development. Rock fracturing is carried out by shear loading. Acoustic emission (AE) monitoring system and CCD camera are used to catch the characteristics of crack evolution. Results demonstrate that crack status is influenced by rock physical properties and its stress boundary, there exists a positive correlation between normal force and crack geometry (such as the angle of en echelon crack). Crack existence follows a distribution of “the whole size of en echelon crack and the local region of pinnate crack” in terms of spatial-temporal aspects. Crack development manifests the characteristics of “Inheritance and Variability”.
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