Abstract：Aiming at the marble selected from Sichuan Jinping Ⅱ hydropower station,the dynamic tests were conducted for a meso-damage process carrying scanning electron microscopy with a loading device of it,in which the whole process observation experiment on rock surface under uniaxial compression loading was carried out. The growth process of acquiring images of cracks in the test were used to study the image processing,analysis,visualization and algorithm development,obtaining the important parameters in the process of damage and failure of rocks( length,area,angle and so on),and damage quantification failure analysis. The results show that: in the process of loading,length and angle,the area of meso-structure parameters obey a certain distribution and evolution; the loading process branch crack grows extremely,and post load crack grows rapidly,eventually forming shear failure surface.

Keyword：marble;meso-damage;stress concentration;bifurcated cracks;analysis of marble;