EXPERIMENTAL AND THEORETICAL STUDY ON SIZE EFFECT ON STRAIN SOFTENING OF ROCK MATERIALS
岩石材料应变软化尺寸效应的实验和理论研究

The sandrock specimens of different diameters and heights in stress-strain test are adopted. The size effect on rock strain softening is found. The rock brittleness increases after postpeak with the height of the specimen. To this result, the theoretical analysis and experimental result reach a good agreement by using the gradient plastic theory.