68 Experimental Study on Microcosmic Failure Mechanism of Surrounding Rock under Complex Stress State

In order to research the relationship between rock minuteness structure and macroscopic mechanical behavior, the technique of SEM is applied to marble fracture of surrounding rock in diversion tunnel of a hydropower project, and a lot of information of SEM in fracture is obtained. The main research content is information abstraction and measurement of minuteness structure with computer image processing and analysis techniques and pattern recognition principle.