Abstract: Micro-cracks will form and expand in brittle materials such as rocks with the increase of load, which will be accompanied by acoustic emission. Acoustic emission is a good tool for studying the damage evolution in brittle materials, and it can be used to monitor the formation and growth of the microwaves in brittle materials in a continuous and real-time way, which is a predominance that other methods do not possess. Linearity equation of acoustic emission and damage variables were set up by using statistic rules and continuous damage mechanic theory. Biaxial compression experiments were made by marble rocks with various pore rates. Rock burst under bidirectional loads was simulated, acoustic emission characteristic of the damage process studied, and the mechanism of rock burst occurrence was analyzed from the viewpoint of rock damage. The study indicates that rock acoustic emission testing technology, which can be used to trace the formation and development process of rock burst, is a scientific and effective method for studying rock burst mechanism.

Key words: Rock mechanics, Rock burst, Acoustic emission, Rock damage variable, Mechanism